| Station Name |
Months |
Country |
Earliest |
Most Recent |
| MO | 72 | Sweden | Jan 1961 | Mar 1967 |
| MO I RANA AP | 348 | Norway | Mar 1980 | Oct 2013 |
| MO I RANA III | 105 | Norway | Jan 1957 | Sep 1965 |
| MO I RANA LUFTHAVN | 25 | Norway | Jun 2011 | Aug 2013 |
| MOAB | 1470 | United States | Oct 1889 | Oct 2013 |
| MOAB CANYONLAND AP | 179 | United States | Aug 1998 | Oct 2013 |
| MOANDA | 407 | Gabon | Apr 1958 | Sep 2001 |
| MOBAYE | 85 | Central African Republic | Aug 1992 | Dec 2012 |
| MOBERLY | 1364 | United States | Sep 1899 | Oct 2013 |
| MOBILE DOWNTOWN AP | 679 | United States | Jul 1942 | Oct 2013 |
| MOBILE STATE DOCKS | 37 | United States | Aug 2010 | Oct 2013 |
| MOBILE UA STN ATLANT | 142 | Canada | Nov 1977 | Jul 2006 |
| MOBILE WB CITY | 429 | United States | Jan 1930 | Dec 1965 |
| MOBILE/BATES FIELD, AL. | 1690 | United States | Jan 1873 | Oct 2013 |
| MOBRIDGE 2 NNW | 1047 | United States | Jan 1911 | Sep 2013 |
| MOBRIDGE MUNICIPAL AP | 431 | United States | Jan 1973 | Oct 2013 |
| MOBURG CANYON IDAHO | 305 | United States | Feb 1985 | Oct 2013 |
| MOCA DOMINICAN REP. BOGUS = | 68 | Dominica | Jan 1961 | Jul 1968 |
| MOCAMEDES (NAMIBE) | 483 | Angola | Jan 1916 | May 1986 |
| MOCCASIN EXPERIMENT STN | 1240 | United States | Apr 1909 | Sep 2013 |
| MOCCASIN-EXPERIMENT | 1042 | United States | Apr 1909 | Nov 1996 |
| MOCHOVCE | 43 | Slovakia | Mar 2010 | Oct 2013 |
| MOCKFJARD | 258 | Sweden | Apr 1973 | Oct 1995 |
| MOCKINGBIRD LO | 12 | Canada | Jun 2004 | Aug 2008 |
| MOCKSVILLE 5 SE | 497 | United States | Feb 1893 | Sep 2013 |
| MOCLIPS | 67 | United States | Apr 1937 | Oct 1942 |
| MOCOPULLI AIRPORT | 7 | Chile | Mar 2013 | Oct 2013 |
| MOCORITO | 323 | Mexico | Mar 1926 | Dec 1997 |
| MOCORO/17 ROSADO | 199 | Brazil | Apr 1974 | Oct 2013 |
| MOCREA | 71 | Romania | Mar 1985 | Feb 1992 |
| MODALEN III | 192 | Norway | Jun 1986 | Oct 2013 |
| MODENA | 1203 | United States | Jan 1901 | Mar 2004 |
| MODENA | 24 | Italy | Mar 2006 | Dec 2008 |
| MODESTO CITY CO HAR | 487 | United States | Jan 1973 | Oct 2013 |
| MODESTO CITY-COUNTY AP | 1032 | United States | May 1927 | Oct 2013 |
| MODLIN | 14 | Poland | Aug 2012 | Oct 2013 |
| MODOC NWR CALIFORNIA | 133 | United States | Jul 2002 | Oct 2013 |
| MODOC ORCHARD | 610 | United States | Apr 1915 | Mar 1966 |
| MOEHLIN | 33 | Switzerland | Feb 2011 | Oct 2013 |
| MOEL-Y-CRIO | 224 | United Kingdom | May 1986 | Aug 2005 |
| MOEN | 335 | Denmark | Dec 1977 | May 2006 |
| MOENCHENGLADBACH | 37 | Germany | Sep 1939 | Oct 1942 |
| MOENGO SURINAM | 18 | Suriname | Jan 1961 | Jan 1963 |
| MOENICHKIRCHEN | 381 | Austria | Feb 1966 | Oct 2013 |
| MOENVILLE 6 E | 194 | United States | Aug 1940 | Oct 1957 |
| MOEROEN | 871 | Mongolia | Jan 1941 | Oct 2013 |
| MOESULPO AB | 511 | Korea, South | Aug 1954 | Jul 2005 |
| MOFFAT CREEK | 70 | Canada | Aug 1975 | Jul 1986 |
| MOFFIT 3 SE | 1267 | United States | May 1894 | Jun 2012 |
| MOFFIT-3SE | 1111 | United States | Apr 1889 | Nov 1990 |
| MOGADISHCIO | 822 | Somalia | Feb 1911 | Mar 1990 |
| MOGADOR | 638 | Morocco | Feb 1878 | Dec 1962 |
| MOGGILL VET RES FARM | 50 | Australia | Oct 1968 | Oct 1975 |
| MOGILEV BYELORUSSIA FORMER | 626 | Belarus | May 1955 | Oct 2013 |
| MOGOCHA | 1145 | Russia | Aug 1910 | Oct 2013 |
| MOGOLLON | 132 | United States | Mar 1937 | Apr 1948 |
| MOGZON | 264 | Russia | Jan 1949 | Jan 1995 |
| MOHABAD | 149 | Iran | Feb 1992 | Oct 2013 |
| MOHALL | 1361 | United States | Sep 1893 | Sep 2013 |
| MOHAWK | 442 | United States | Feb 1907 | May 1951 |
| MOHE | 453 | China | Jan 1973 | Oct 2013 |
| MOHE | 403 | China | Apr 1957 | Dec 1990 |
| MOHONK LAKE | 1393 | United States | Jan 1896 | Oct 2013 |
| MOHONK-LAKE | 1112 | United States | Jan 1896 | Dec 1990 |
| MOHYLIV-PODILSKYI | 519 | Ukraine | Jul 1961 | Oct 2013 |
| MOIKIPAA | 202 | Finland | Mar 1974 | Jan 1991 |
| MOINTY | 313 | Kazakhstan | Dec 1937 | Mar 1992 |
| MOIRA | 349 | United States | Apr 1900 | Oct 1930 |
| MOIRA STATE FOREST | 46 | Australia | Jan 1965 | Dec 1969 |
| MOJAVE 2 ESE | 71 | United States | May 1963 | Jun 1969 |
| MOJAVE AIRPORT | 691 | United States | Jan 1904 | Oct 2013 |
| MOJAVE RIVER SINK CALIFORNIA | 268 | United States | Mar 1988 | Nov 2011 |
| MOJOSARI | 22 | Indonesia | Jan 1998 | Mar 2000 |
| MOKHA/AL MOCHA | 44 | Yemen | Feb 1994 | Oct 2013 |
| MOKOHINAU AWS | 220 | New Zealand | Sep 1994 | Oct 2013 |
| MOKP'O | 1305 | Korea, South | Jan 1905 | Oct 2013 |
| MOKUOLOE | 28 | United States | Aug 2008 | Oct 2013 |
| MOLALLA 1 NW | 425 | United States | Dec 1948 | Oct 2013 |
| MOLAS LAKE | 286 | United States | Sep 1986 | Oct 2013 |
| MOLASSES REEF | 292 | United States | Oct 1988 | Oct 2013 |
| MOLCHANOVO | 290 | Russia | Aug 1954 | Oct 2013 |
| MOLD | 44 | United States | Jun 1913 | Jan 1918 |
| MOLDE AP | 450 | Norway | Feb 1976 | Oct 2013 |
| MOLDE LUFTHAVN | 127 | Norway | Oct 2002 | Aug 2013 |
| MOLDOVA VECHE | 189 | Romania | May 1983 | Sep 2002 |
| MOLESWORTH RAF STATION | 37 | United Kingdom | Mar 1954 | Apr 1957 |
| MOLINA DE ARAGON | 599 | Spain | Dec 1949 | Aug 2012 |
| MOLINE BRG | 12 | United States | Jun 1955 | May 1956 |
| MOLINE QUAD CITY INTL AP | 994 | United States | Oct 1929 | Oct 2013 |
| MOLINO | 174 | United States | Apr 1902 | Jul 1919 |
| MOLINO BLANCO | 501 | Mexico | Jan 1952 | Nov 1998 |
| MOLKOM | 92 | Sweden | Dec 1969 | Jan 1979 |
| MOLLA | 228 | Sweden | Aug 1973 | Nov 1995 |
| MOLLA | 224 | Sweden | Jul 1979 | Dec 2001 |
| MOLLUSK 1 SW | 37 | United States | Sep 1974 | Jan 1979 |
| MOLOAA DAIRY HAWAII | 58 | United States | May 2002 | Aug 2012 |
| MOLODECNO | 47 | Belarus | Sep 1976 | Dec 1981 |
| MOLODEZHNAYA | 435 | Antarctica | Feb 1963 | Jun 1999 |
| MOLOKAI (AMOS) | 552 | United States | Feb 1940 | Oct 2013 |
| MOLOKAI 1 HAWAII | 107 | United States | May 2003 | Oct 2013 |
| MOLOKAI AIRPORT MOLOKAI HAWAI | 768 | United States | Jun 1949 | Oct 2013 |
| MOLONG POST OFFICE | 815 | Australia | Jan 1907 | Jul 1975 |
| MOLOTOV (PERM) | 1574 | Russia | Sep 1882 | Oct 2013 |
| MOLUOLOE | 65 | United States | Apr 2008 | Oct 2013 |
| MOMBASA | 647 | Kenya | Jan 1893 | Dec 1962 |
| MOMBASA INTERNATIONAL AIRPORT | 924 | Kenya | Jan 1931 | Oct 2013 |
| MOMBETSU | 689 | Japan | Jan 1956 | Oct 2013 |
| MOMBETSU AIRPORT | 443 | Japan | Sep 1974 | Oct 2013 |
| MOMBO | 43 | Tanzania | Mar 1958 | Dec 1961 |
| MOMOTE AIRPORT / MANUS IS | 66 | Papua New Guinea | Jan 2000 | Mar 2012 |
| MOMOTE/ADMIRALTY IS. | 524 | Papua New Guinea | Jan 1951 | Dec 1996 |
| MOMOTE_W.O. PAPUA N | 148 | Papua New Guinea | Jan 1997 | Oct 2013 |
| MONA | 66 | United Kingdom | Jun 1943 | Oct 2013 |
| MONA ISLAND | 38 | United States | Aug 2009 | Oct 2013 |
| MONA ISLAND LIGHT STN | 303 | Puerto Rico [United States] | Mar 1949 | May 2010 |
| MONAHANS 1 NW | 582 | United States | Feb 1950 | Dec 2008 |
| MONAHANS 6 ENE | 125 | United States | Jun 2003 | Oct 2013 |
| MONARCH | 364 | Canada | Oct 1981 | Sep 2012 |
| MONARCH | 14 | United States | Feb 1894 | Apr 1895 |
| MONARCH | 8 | United States | Jan 1897 | Feb 1898 |
| MONARCH PASS | 10 | United States | Jan 2005 | Dec 2005 |
| MONASHKA CREEK DAM | 32 | United States | May 1910 | Sep 2013 |
| MONASTIR-SKANES | 513 | Tunisia | Jul 1943 | Oct 2013 |
| MONCHEGORSK | 146 | Russia | Sep 1969 | Oct 2013 |
| MONCHENGLADBACH | 202 | Germany | Dec 1996 | Oct 2013 |
| MONCION | 120 | Dominican Republic | Jan 1961 | Dec 1970 |
| MONCKS CORNER | 50 | United States | Feb 2009 | Oct 2013 |
| MONCKS CORNER 4 N | 206 | United States | Oct 1994 | Sep 2013 |
| MONCLOVA COAH. | 1022 | Mexico | Feb 1921 | Oct 2013 |
| MONCTON A, NB | 1432 | Canada | Aug 1881 | Oct 2013 |
| MONCTON AIRPORT | 868 | Canada | Dec 1939 | May 2012 |
| MONCURE 3 SE | 999 | United States | Aug 1894 | Jun 1979 |
| MONDOVI | 1152 | United States | May 1908 | Aug 2013 |
| MONDOVI | 303 | Italy | Nov 1984 | Oct 2013 |
| MONDSEE | 39 | Austria | Jun 2010 | Oct 2013 |
| MONDY | 586 | Russia | Oct 1949 | Oct 2013 |
| MONERO | 76 | United States | Jan 1893 | Oct 1899 |
| MONETT MUNI | 34 | United States | Feb 2009 | Jan 2012 |
| MONETTA | 178 | United States | Jul 1907 | Mar 1923 |
| MONETTE, MO. | 729 | United States | Jan 1947 | Sep 2013 |
| MONETVILLE | 466 | Canada | Jul 1963 | Nov 2006 |
| MONEY POINT | 101 | United States | Mar 2005 | Oct 2013 |
| MONEYDIG | 41 | United Kingdom | Jan 1973 | May 1980 |
| MONG CAI | 246 | Vietnam | Oct 1974 | Oct 2013 |
| MONGATALYANG | 136 | Russia | May 1981 | Aug 1994 |
| MONGLA | 120 | Bangladesh | Jan 1991 | Dec 2000 |
| MONGO | 342 | Chad | Jan 1950 | Dec 1978 |
| MONGOLIAN STATION CENTRAL | 257 | Mongolia | Feb 1962 | Nov 1983 |
| MONGOLIAN STATION CENTRAL | 228 | Mongolia | Jun 1942 | Aug 1961 |
| MONGOLIAN STATION CENTRAL | 227 | Mongolia | Jan 1965 | Dec 1983 |
| MONGOLIAN STATION CENTRAL | 88 | Mongolia | May 1956 | Dec 1963 |
| MONGOLIAN STATION EAST GOVI | 167 | Mongolia | Jul 1941 | Jun 1955 |
| MONGOLIAN STATION EAST GOVI | 107 | Mongolia | Jan 1974 | Nov 1983 |
| MONGOLIAN STATION EASTERN | 253 | Mongolia | Jan 1962 | Oct 1983 |
| MONGOLIAN STATION EASTERN | 146 | Mongolia | Jan 1944 | Mar 1956 |
| MONGOLIAN STATION GOVIALTAY | 284 | Mongolia | Jan 1960 | Nov 1983 |
| MONGOLIAN STATION GOVIALTAY | 213 | Mongolia | Aug 1965 | Aug 1983 |
| MONGOLIAN STATION HOVD | 113 | Mongolia | Jan 1974 | Aug 1983 |
| MONGOLIAN STATION N. HANGAY | 166 | Mongolia | Dec 1969 | Dec 1983 |
| MONGOLIAN STATION SELENGE | 166 | Mongolia | Jan 1965 | Dec 1978 |
| MONGOLIAN STATION SOUTH GOVI | 151 | Mongolia | Jan 1971 | Nov 1983 |
| MONGOLIAN STATION BAYAN-OLGIY | 828 | Mongolia | Jan 1943 | Oct 2013 |
| MONGOLIAN STATION BAYANHONGOR | 122 | Mongolia | Mar 1973 | Aug 1983 |
| MONGU S. RHODESIA/ZAMBIA | 934 | Zambia | Jul 1923 | Nov 2005 |
| MONHEGAN/MANANA ISL | 125 | United States | Oct 1975 | Sep 1988 |
| MONIDA | 240 | United States | Apr 1943 | Feb 1992 |
| MONITOR MILL | 50 | United States | Apr 1897 | Apr 1903 |
| MONITOR PASS | 235 | United States | Oct 1990 | Oct 2013 |
| MONMOUTH | 1465 | United States | Feb 1881 | Sep 2013 |
| MONMOUTH | 22 | United States | Mar 1898 | Jan 1901 |
| MONMOUTH 4 NW | 202 | United States | Apr 1995 | Oct 2013 |
| MONMOUTH 4 SW | 138 | United States | Jul 1940 | Apr 1953 |
| MONO LAKE | 458 | United States | Feb 1944 | Feb 1988 |
| MONROE | 975 | United States | Mar 1929 | Oct 2013 |
| MONROE | 434 | United States | Aug 1911 | Oct 1948 |
| MONROE | 60 | United States | Nov 1891 | Dec 1896 |
| MONROE 1 W | 144 | United States | Jul 1972 | Sep 2013 |
| MONROE 2 SE | 1408 | United States | Feb 1896 | Oct 2013 |
| MONROE 26 N | 127 | United States | Feb 2003 | Oct 2013 |
| MONROE 5 NNE | 650 | United States | Mar 1931 | May 1998 |
| MONROE AIRPORT | 144 | United States | Sep 2001 | Oct 2013 |
| MONROE AP | 175 | United States | Feb 1999 | Oct 2013 |
| MONROE CITY | 505 | United States | Aug 1893 | May 1977 |
| MONROE CITY | 422 | United States | Aug 1901 | Oct 2013 |
| MONROE DELTA CC | 384 | United States | Feb 1977 | Aug 2009 |
| MONROE MUNI AP | 142 | United States | Sep 2001 | Oct 2013 |
| MONROE WWTP | 1116 | United States | Apr 1917 | Oct 2013 |
| MONROE-4SE | 1157 | United States | Jan 1888 | Dec 1990 |
| MONROE/MUNICIPAL ARPT | 1000 | United States | Jan 1930 | Oct 2013 |
| MONROVIA | 13 | United States | Oct 1952 | Oct 1953 |
| MONS | 122 | United States | Apr 1946 | Oct 1958 |
| MONSANTO | 341 | United States | Feb 1948 | Jul 1976 |
| MONSON | 307 | United States | Jan 1885 | Dec 1911 |
| MONSYR | 100 | Kazakhstan | Jan 1959 | Nov 1989 |
| MONT AIGOUAL | 878 | France | Apr 1935 | Oct 2013 |
| MONT APICA,QU | 326 | Canada | Mar 1963 | Apr 1990 |
| MONT BLEU | 100 | Canada | Mar 1963 | Nov 1988 |
| MONT BRUN | 344 | Canada | Jun 1980 | Aug 2012 |
| MONT DE MARSAN | 472 | France | Jan 1973 | Oct 2013 |
| MONT JOLI AIRPORT | 54 | Canada | Jan 1973 | Jun 1977 |
| MONT JOLI ARPT | 1425 | Canada | Jan 1895 | Oct 2013 |
| MONT LAURIER | 967 | Canada | Jul 1920 | Jun 2013 |
| MONT LOGAN | 119 | Canada | Nov 1963 | Mar 1975 |
| MONT LOUIS | 512 | Canada | Apr 1939 | Mar 1994 |
| MONT MEGANTIC | 61 | Canada | Mar 1979 | Jul 1989 |
| MONT SAINT VINCENT | 178 | France | Jan 1973 | Sep 1991 |
| MONT ST HILAIRE | 118 | Canada | Jan 1960 | Dec 1969 |
| MONT ST HILAIRE MCGILL | 71 | Canada | Sep 1967 | May 1974 |
| MONT TREMBLANT INTL | 128 | Canada | Sep 1942 | Jun 1966 |
| MONT VENTOUX | 32 | France | Jan 1949 | Feb 1967 |
| MONT-RIGI | 67 | Belgium and Luxemborg | Mar 2008 | Oct 2013 |
| MONTAGUE | 237 | United States | Jan 1944 | Mar 1964 |
| MONTAGUE | 149 | Canada | Dec 1961 | Sep 1977 |
| MONTAGUE | 54 | United States | Jan 1948 | Mar 1990 |
| MONTAGUE | 48 | Canada | Mar 1910 | Mar 1915 |
| MONTAGUE 4 NW | 815 | United States | Dec 1902 | Sep 2013 |
| MONTAGUE ISLAND LIGHTHOUSE | 462 | Australia | Dec 1968 | Oct 2013 |
| MONTAGUE SISKIYOU COUNTY AP | 644 | United States | May 1948 | Oct 2013 |
| MONTAGUE YREKA MUNI AP | 217 | United States | Jan 1931 | Dec 1949 |
| MONTANA | 414 | Switzerland | Apr 1979 | Oct 2013 |
| MONTANA RANGE SHEEP EXP STN | 16 | United States | Mar 1939 | Sep 1940 |
| MONTAUBAN | 144 | France | Oct 2001 | Oct 2013 |
| MONTAUBAN | 61 | France | Mar 1998 | Jan 2004 |
| MONTAUK | 41 | United States | Nov 2009 | Oct 2013 |
| MONTAUK AIRPORT | 250 | United States | May 1973 | Oct 2013 |
| MONTBEILLARD | 162 | Canada | Jan 1973 | Dec 1990 |
| MONTDIDIER | 1024 | France | Jan 1784 | Dec 1869 |
| MONTE ALEGRE | 35 | Brazil | Dec 2005 | Dec 2009 |
| MONTE ARGENTARIO | 501 | Italy | Nov 1961 | Oct 2013 |
| MONTE BISBINO | 259 | Italy | Feb 1975 | Jun 2008 |
| MONTE CASEROS AERO | 617 | Argentina | Jan 1961 | Oct 2013 |
| MONTE CIMONE | 698 | Italy | Jan 1951 | Oct 2013 |
| MONTE CREEK WEST | 95 | Canada | Jul 1988 | Oct 1996 |
| MONTE CRISTI DOMINICAN REPUBLI | 479 | Dominican Republic | Jan 1951 | Dec 1990 |
| MONTE CRISTO | 309 | United States | Mar 1984 | Oct 2013 |
| MONTE CRISTO | 43 | United States | Mar 1895 | Sep 1901 |
| MONTE DOURADO | 55 | Brazil | Oct 2007 | Oct 2013 |
| MONTE GENEROSO | 11 | Switzerland | Dec 2012 | Oct 2013 |
| MONTE IZANA / TENERIFE | 140 | Canary Islands [Spain] | Jul 1916 | Aug 2013 |
| MONTE LAKE PAXTON VALLEY | 201 | Canada | May 1972 | Nov 1990 |
| MONTE LIMBARA | 35 | Italy | Oct 2005 | Jan 2009 |
| MONTE MALANOTTE | 228 | Italy | Mar 1975 | Mar 2013 |
| MONTE PLATA DOMINICAN REPU | 356 | Dominican Republic | Aug 1951 | Oct 1987 |
| MONTE REAL | 189 | Portugal | Dec 1997 | Oct 2013 |
| MONTE S. ANGELO | 725 | Italy | Jan 1952 | Oct 2013 |
| MONTE SETTEPANI | 20 | Italy | Sep 2005 | Jul 2007 |
| MONTE TERMINILLO | 16 | Italy | Jan 1992 | Aug 2000 |
| MONTE VISTA 2 W | 842 | United States | Feb 1896 | Sep 2013 |
| MONTEAGLE | 877 | United States | Nov 1938 | Oct 2013 |
| MONTEAGUDO | 30 | Bolivia | Jan 2009 | Dec 2011 |
| MONTEBELLO | 282 | United States | Jan 1979 | Sep 2010 |
| MONTEBELLO (SEDBERGH) | 488 | Canada | Dec 1956 | Jul 2012 |
| MONTEBELLO 1 SE | 100 | United States | Feb 1946 | Jun 2000 |
| MONTEBELLO FISH CULTURAL STN | 50 | United States | Aug 2007 | Sep 2013 |
| MONTEBELLO SEIGNIORY | 625 | Canada | Jun 1930 | Dec 1984 |
| MONTECITO CALIFORNIA | 203 | United States | Oct 1996 | Oct 2013 |
| MONTEGO BAY-SANGSTER / JA | 687 | Jamaica | Jan 1938 | Oct 2013 |
| MONTELIMAR | 1063 | France | Jan 1925 | Oct 2013 |
| MONTELLO | 665 | United States | Oct 1954 | Oct 2013 |
| MONTELLO 1 SE | 1207 | United States | May 1902 | Sep 2013 |
| MONTEMORELOS, NUEVO LEON | 541 | Mexico | Jan 1927 | May 1986 |
| MONTEPUEZ | 16 | Mozambique | Mar 1981 | May 1984 |
| MONTEREY | 777 | United States | Oct 1941 | Sep 2013 |
| MONTEREY | 582 | United States | Dec 1894 | May 1990 |
| MONTEREY | 347 | United States | Aug 1904 | Oct 2013 |
| MONTEREY NAF | 330 | United States | Sep 1945 | Jul 2013 |
| MONTEREY NWSFO | 218 | United States | Jul 1995 | Oct 2013 |
| MONTEREY PENINSULA AIRPORT | 532 | United States | Jul 1968 | Oct 2013 |
| MONTERIA/BERASTEGOI | 10 | Colombia | Aug 1969 | Jun 1970 |
| MONTERIA/LOS GARZONES | 140 | Colombia | Oct 1964 | Oct 2013 |
| MONTERO | 204 | Bolivia | Aug 1942 | Dec 1962 |
| MONTERREY (CITY) | 1269 | Mexico | Jan 1905 | Sep 2013 |
| MONTERREY/ESCOBEDO | 86 | Mexico | Apr 1987 | Jun 1994 |
| MONTES CLAROS | 421 | Brazil | Jan 1973 | Oct 2013 |
| MONTEVENTOSO | 78 | Spain | Dec 1992 | Jan 2001 |
| MONTEVIDEO | 324 | Uruguay | Dec 1883 | Dec 1918 |
| MONTEVIDEO | 168 | Uruguay | Jan 1930 | Dec 1943 |
| MONTEVIDEO 1 SW | 1438 | United States | Jan 1893 | Oct 2013 |
| MONTEVIDEO CHIPPEWA AP | 252 | United States | Sep 1992 | Oct 2013 |
| MONTEVIDEO-1SW | 1209 | United States | Aug 1889 | Dec 1990 |
| MONTEVIDEO/PRADO | 1296 | Uruguay | Jan 1883 | Oct 2013 |
| MONTEVIDEO/PRADO OBSERV URUGUA | 650 | Uruguay | Jul 1957 | Oct 2013 |
| MONTEVIEW | 23 | United States | May 2011 | Sep 2013 |
| MONTEZUMA | 182 | United States | Dec 1939 | Aug 1955 |
| MONTEZUMA | 35 | United States | Feb 1959 | May 1963 |
| MONTEZUMA 1 W | 31 | United States | Aug 1937 | Mar 1940 |
| MONTEZUMA 5 NNW | 204 | United States | Aug 1996 | Sep 2013 |
| MONTEZUMA CASTLE N M | 893 | United States | Oct 1938 | Jul 2013 |
| MONTEZUMA CREEK | 67 | United States | Jun 1951 | Dec 1956 |
| MONTGOMERY | 38 | United States | Nov 1896 | Nov 1900 |
| MONTGOMERY 6 SW | 181 | United States | Mar 1998 | Oct 2013 |
| MONTGOMERY ALABAMA/GUNTER FLD | 45 | United States | Jan 1942 | Dec 1945 |
| MONTGOMERY BELL SP | 102 | United States | Feb 2005 | Oct 2013 |
| MONTGOMERY CO AIRPA | 67 | United States | Nov 2007 | Sep 2013 |
| MONTGOMERY DANNELLY FIELD | 920 | United States | Feb 1937 | Oct 2013 |
| MONTGOMERY LOCK & DAM | 618 | United States | Jan 1962 | Oct 2013 |
| MONTGOMERY MNTC STN | 213 | United States | May 1960 | May 1980 |
| MONTGOMERY ORANGE AP | 182 | United States | Jan 1998 | Oct 2013 |
| MONTGOMERY ORANGE COUNTY AP | 172 | United States | Apr 1999 | Oct 2013 |
| MONTGOMERY RANCH | 223 | United States | Apr 1930 | Feb 1949 |
| MONTGOMERY WB CITY | 981 | United States | Sep 1872 | Sep 1954 |
| MONTICELLO | 1322 | United States | May 1893 | Jul 2013 |
| MONTICELLO | 1264 | United States | Apr 1907 | Oct 2013 |
| MONTICELLO | 482 | Canada | Dec 1960 | Nov 2003 |
| MONTICELLO | 459 | Canada | Oct 1954 | Sep 1994 |
| MONTICELLO | 369 | United States | Sep 1982 | Sep 2013 |
| MONTICELLO | 137 | United States | Jan 1893 | Jan 1906 |
| MONTICELLO | 69 | United States | Nov 1920 | Jan 1931 |
| MONTICELLO | 33 | United States | Oct 2010 | Jul 2013 |
| MONTICELLO | 22 | United States | May 1899 | Mar 1903 |
| MONTICELLO 10 SW | 64 | United States | Aug 2007 | Oct 2013 |
| MONTICELLO 2 | 7 | United States | Aug 2004 | Feb 2005 |
| MONTICELLO 2 NW | 35 | United States | Jun 1956 | Jan 1960 |
| MONTICELLO 24 NW | 37 | United States | Sep 2010 | Oct 2013 |
| MONTICELLO 3 NE | 678 | United States | Jul 1956 | Jun 2013 |
| MONTICELLO 5 SE | 1160 | United States | Feb 1904 | Aug 2013 |
| MONTICELLO DAM | 145 | United States | Dec 1957 | Jan 1970 |
| MONTICELLO MUNI AP | 10 | United States | Jan 2005 | Dec 2005 |
| MONTICELLO MUNICIPAL AP | 928 | United States | Feb 1876 | Oct 2013 |
| MONTICELLO NO. 2 | 1133 | United States | Apr 1902 | Sep 2013 |
| MONTICELLO RGNL | 219 | United States | Mar 1995 | Oct 2013 |
| MONTICELLO SULLIVAN | 9 | United States | Jan 2005 | Dec 2005 |
| MONTICELLO WAYNE CO AP | 85 | United States | May 2006 | Oct 2013 |
| MONTICHIARI | 112 | Italy | Jun 2004 | Oct 2013 |
| MONTIJO | 190 | Portugal | Dec 1997 | Oct 2013 |
| MONTLUCON GUERET | 40 | France | Feb 2000 | Feb 2008 |
| MONTMAGNY | 404 | Canada | Jan 1963 | Dec 2001 |
| MONTMARTRE | 121 | Canada | Jul 1986 | Mar 2001 |
| MONTO AIRPORT | 169 | Australia | Jun 1990 | Jan 2005 |
| MONTO POST OFFICE WAS 03 | 465 | Australia | Jan 1962 | Sep 2013 |
| MONTPELIER | 1297 | United States | Jun 1893 | Sep 2013 |
| MONTPELIER | 32 | United States | Apr 2004 | Apr 2009 |
| MONTPELIER 2 | 139 | United States | Dec 2001 | Oct 2013 |
| MONTPELIER RANGER STN | 882 | United States | Jul 1914 | Apr 1991 |
| MONTPELLIER | 1075 | France | Apr 1827 | Oct 2013 |
| MONTREAL | 93 | United States | Dec 1897 | Oct 1905 |
| MONTREAL FALLS | 310 | Canada | Jan 1942 | Sep 1998 |
| MONTREAL INTL MIRAB | 193 | Canada | Oct 1957 | Oct 2013 |
| MONTREAL JAR BOT | 466 | Canada | May 1948 | Sep 1989 |
| MONTREAL JEAN BREBEUF | 331 | Canada | Mar 1956 | Mar 1985 |
| MONTREAL LAFONTAINE | 232 | Canada | Jan 1971 | Apr 1992 |
| MONTREAL MCGILL,QU | 1550 | Canada | Jul 1871 | Sep 2001 |
| MONTREAL MIRABEL | 23 | Canada | Jan 2011 | Oct 2013 |
| MONTREAL RIVER | 654 | Canada | Dec 1910 | Oct 1967 |
| MONTREAL RIVER (AUT) | 20 | Canada | Jan 2004 | Dec 2006 |
| MONTREAL/DORVAL INT'L,QUE | 863 | Canada | Sep 1941 | Sep 2013 |
| MONTREAL/MIRABEL | 395 | Canada | Oct 1975 | Oct 2008 |
| MONTREAL/ST HUBERT | 264 | Canada | Jun 1986 | Oct 2013 |
| MONTREAL/ST-HUBERT A | 60 | Canada | Jan 2005 | Jan 2010 |
| MONTREAL/TRUDEAU INT | 487 | Canada | Jan 1955 | Oct 2013 |
| MONTREAT | 357 | United States | Jan 1917 | Aug 1947 |
| MONTROSE | 1230 | United States | Sep 1903 | May 2009 |
| MONTROSE | 1078 | United States | Sep 1903 | Nov 1996 |
| MONTROSE | 115 | United States | Sep 1963 | Aug 1973 |
| MONTROSE 11 ENE | 111 | United States | Aug 2004 | Oct 2013 |
| MONTROSE 8 N | 316 | United States | Mar 1898 | Sep 2013 |
| MONTROSE CO. ARPT | 85 | United States | Jan 1973 | Feb 1990 |
| MONTROSE NO. 2 | 1491 | United States | Mar 1885 | Oct 2013 |
| MONTROSE REGIONAL AP | 407 | United States | Jan 1973 | Oct 2013 |
| MONTROSE-#2 | 1164 | United States | Mar 1885 | Dec 1990 |
| MONTSENY | 259 | Spain | Feb 1941 | Dec 1987 |
| MONTSENY MTN RANGE | 58 | Spain | Oct 1975 | Oct 1987 |
| MONUMENT 2 | 452 | United States | Feb 1961 | Aug 2010 |
| MONUMENT 2 WSW | 899 | United States | Jan 1911 | Oct 2013 |
| MONUMENT PASS | 10 | United States | Jan 2005 | Dec 2005 |
| MONUMENT PEAK | 264 | United States | Oct 1990 | Oct 2013 |
| MONUMENT RANGER STN | 32 | United States | Oct 1915 | Sep 1918 |
| MONUMENT VALLEY GOULDINGS | 359 | United States | Jun 1956 | Mar 2008 |
| MONUMENT VLY MISSION | 308 | United States | Aug 1961 | Dec 1989 |
| MONYWA | 107 | Burma / Myanmar | Sep 1996 | Oct 2013 |
| MOO CAMP - LOWELL OREGON | 48 | United States | Jul 1985 | Sep 1992 |
| MOODY AFB/VALDOSTA | 793 | United States | Apr 1942 | Oct 2013 |
| MOODY IDAHO | 216 | United States | Jul 1985 | Oct 2013 |
| MOOGARA (UXBRIDGE BACK ROAD) | 158 | Australia | Nov 1991 | Nov 2007 |
| MOOMBA (PRIVATE) | 313 | Australia | Dec 1972 | Jun 1999 |
| MOOMBA AIRPORT | 218 | Australia | Jul 1995 | Oct 2013 |
| MOON HILL OREGON | 233 | United States | Jun 1994 | Oct 2013 |
| MOON LAKE | 195 | United States | Oct 1939 | Sep 1966 |
| MOON LAKE | 177 | Canada | Oct 1952 | Nov 1967 |
| MOON TOWNSHIP | 35 | United States | Oct 2010 | Oct 2013 |
| MOONDARRA RESERVOIR | 119 | Australia | Jan 1974 | Oct 1987 |
| MOONERA | 30 | Australia | Mar 1972 | Sep 1975 |
| MOONSHINE | 290 | United States | Oct 1988 | Oct 2013 |
| MOONSTONE | 98 | Canada | Dec 1992 | Feb 2001 |
| MOORA | 317 | Australia | Mar 1965 | Dec 2003 |
| MOORA (WALEBING) | 767 | Australia | Nov 1901 | Dec 1965 |
| MOORABBIN AIRPORT | 502 | Australia | Aug 1971 | Oct 2013 |
| MOORCROFT 3 ST | 871 | United States | Mar 1903 | Apr 2012 |
| MOORE | 179 | United States | Jul 1901 | May 1917 |
| MOORE CO AP | 253 | United States | Apr 1992 | Oct 2013 |
| MOORE HAVEN LOCK 1 | 1110 | United States | May 1918 | Oct 2013 |
| MOORED BUOY #46087 | 69 | Canada | Feb 2005 | Oct 2013 |
| MOORED BUOY #63107 | 85 | [Missing] | Jan 2006 | Aug 2013 |
| MOORED BUOY 22001 | 170 | United States | Jul 1983 | Sep 2000 |
| MOORED BUOY 41030 | 8 | [Missing] | Oct 2005 | Apr 2008 |
| MOORED BUOY 41033 | 73 | United States | Jun 2005 | Oct 2013 |
| MOORED BUOY 41038 | 78 | [Missing] | Nov 2005 | Oct 2013 |
| MOORED BUOY 41040 | 81 | [Missing] | Aug 2005 | Oct 2013 |
| MOORED BUOY 41041 | 95 | [Missing] | Aug 2005 | Oct 2013 |
| MOORED BUOY 42013 | 30 | [Missing] | Feb 2005 | Jul 2011 |
| MOORED BUOY 42014 | 24 | United States | Jun 2005 | Dec 2007 |
| MOORED BUOY 42021 | 39 | [Missing] | Feb 2005 | Apr 2012 |
| MOORED BUOY 42022 | 38 | [Missing] | Oct 2005 | Oct 2013 |
| MOORED BUOY 42023 | 19 | [Missing] | Sep 2006 | Jun 2008 |
| MOORED BUOY 42038 | 12 | [Missing] | Mar 2005 | Apr 2006 |
| MOORED BUOY 42043 | 32 | [Missing] | Aug 2006 | Jul 2013 |
| MOORED BUOY 42045 | 47 | [Missing] | Oct 2004 | Jan 2012 |
| MOORED BUOY 42046 | 9 | [Missing] | Apr 2007 | Jul 2008 |
| MOORED BUOY 42067 | 7 | [Missing] | Apr 2011 | Nov 2011 |
| MOORED BUOY 44022 | 80 | United States | Oct 2005 | Oct 2013 |
| MOORED BUOY 44024 | 40 | Canada | Mar 2006 | Aug 2013 |
| MOORED BUOY 44029 | 84 | [Missing] | Jan 2006 | Oct 2013 |
| MOORED BUOY 44030 | 96 | [Missing] | Feb 2005 | Oct 2013 |
| MOORED BUOY 44031 | 38 | [Missing] | Jan 2006 | Feb 2009 |
| MOORED BUOY 44032 | 85 | United States | Jan 2006 | Oct 2013 |
| MOORED BUOY 44033 | 99 | United States | Mar 2005 | Oct 2013 |
| MOORED BUOY 44034 | 86 | [Missing] | Feb 2005 | Oct 2013 |
| MOORED BUOY 44035 | 40 | United States | Feb 2005 | Oct 2008 |
| MOORED BUOY 44037 | 80 | [Missing] | Jan 2006 | Oct 2013 |
| MOORED BUOY 44039 | 82 | United States | Apr 2005 | Oct 2013 |
| MOORED BUOY 44040 | 75 | United States | Mar 2005 | Oct 2013 |
| MOORED BUOY 44150 | 54 | United States | Jun 2005 | Apr 2013 |
| MOORED BUOY 45012 | 47 | [Missing] | Jun 2005 | Oct 2013 |
| MOORED BUOY 45140 | 41 | Canada | Jun 2005 | Sep 2013 |
| MOORED BUOY 45142 | 55 | Canada | Sep 2004 | Oct 2013 |
| MOORED BUOY 45143 | 57 | [Missing] | Jul 2005 | Oct 2013 |
| MOORED BUOY 45144 | 22 | Canada | Jun 2006 | Sep 2013 |
| MOORED BUOY 45145 | 36 | Canada | Jul 2005 | Oct 2013 |
| MOORED BUOY 45147 | 52 | Canada | Oct 2004 | Jun 2013 |
| MOORED BUOY 45148 | 31 | Canada | Jul 2005 | Oct 2013 |
| MOORED BUOY 45149 | 48 | Canada | May 2005 | Oct 2013 |
| MOORED BUOY 45151 | 21 | Canada | May 2005 | Aug 2013 |
| MOORED BUOY 45152 | 49 | Canada | May 2005 | Sep 2013 |
| MOORED BUOY 46015 | 81 | [Missing] | Feb 2005 | Oct 2013 |
| MOORED BUOY 46069 | 82 | [Missing] | Mar 2005 | Oct 2013 |
| MOORED BUOY 46071 | 33 | [Missing] | May 2005 | Oct 2009 |
| MOORED BUOY 46072 | 49 | [Missing] | Feb 2005 | Jul 2013 |
| MOORED BUOY 46075 | 60 | [Missing] | Apr 2005 | Oct 2013 |
| MOORED BUOY 46078 | 53 | [Missing] | Mar 2005 | Nov 2011 |
| MOORED BUOY 46081 | 73 | United States | Mar 2005 | Sep 2013 |
| MOORED BUOY 46082 | 94 | [Missing] | Feb 2005 | Sep 2013 |
| MOORED BUOY 46084 | 56 | [Missing] | Feb 2005 | Jul 2012 |
| MOORED BUOY 46086 | 85 | [Missing] | Mar 2005 | Oct 2013 |
| MOORED BUOY 46088 | 92 | [Missing] | Mar 2005 | Sep 2013 |
| MOORED BUOY 46089 | 69 | [Missing] | May 2005 | Oct 2013 |
| MOORED BUOY 46091 | 39 | United States | Nov 2005 | Oct 2011 |
| MOORED BUOY 46092 | 48 | United States | May 2005 | Oct 2013 |
| MOORED BUOY 46093 | 56 | United States | May 2005 | Aug 2011 |
| MOORED BUOY 51028 | 51 | Kiribati | Oct 2004 | Feb 2009 |
| MOORED BUOY 62027 | 7 | United States | Feb 1987 | May 1988 |
| MOORED BUOY 62131 | 26 | [Missing] | Feb 2011 | Jul 2013 |
| MOORED BUOY 62140 | 25 | [Missing] | Apr 2011 | Jul 2013 |
| MOORED BUOY 63055 | 67 | [Missing] | Oct 2004 | Jul 2013 |
| MOORED BUOY 64049 | 45 | [Missing] | Jun 2006 | May 2011 |
| MOORED BUOY ACMN4 | 70 | United States | Aug 2004 | Sep 2011 |
| MOORED BUOY AVAN4 | 60 | United States | Aug 2004 | Jun 2011 |
| MOORED BUOY BRBN4 | 31 | United States | Aug 2004 | Oct 2010 |
| MOOREFIELD | 86 | United States | Sep 2001 | Oct 2012 |
| MOOREFIELD 1 SSE | 1073 | United States | Dec 1895 | Oct 2013 |
| MOOREFIELD MC NEILL | 182 | United States | Jan 1949 | Sep 1964 |
| MOORES CREEK NB | 90 | United States | Feb 2006 | Sep 2013 |
| MOORES CREEK SUMMIT | 335 | United States | Dec 1982 | Oct 2013 |
| MOORES HILL | 692 | United States | Feb 1902 | Oct 1959 |
| MOORESTOWN | 1741 | United States | Apr 1863 | Oct 2012 |
| MOORHEAD | 1164 | United States | Apr 1913 | Oct 2013 |
| MOORHEAD 9 NE | 709 | United States | Jun 1948 | Oct 2013 |
| MOORHEAD MUNI AP | 112 | United States | Jun 2004 | Oct 2013 |
| MOORHEAD ST TEACHERS C | 857 | United States | Jan 1900 | Oct 2013 |
| MOORINGSPORT 1 N | 129 | United States | Jan 2003 | Oct 2013 |
| MOORMAN RANCH - RUTH 16WNW | 136 | United States | Feb 2002 | Oct 2013 |
| MOOSE 1 NNE | 111 | United States | Jul 2004 | Oct 2013 |
| MOOSE CREEK | 276 | United States | Oct 1989 | Oct 2013 |
| MOOSE CREEK IDAHO | 139 | United States | Jun 1990 | Oct 2013 |
| MOOSE CREEK RANCH | 14 | United States | Dec 1962 | Jun 1964 |
| MOOSE HDQTS | 923 | United States | Oct 1935 | Sep 2013 |
| MOOSE JAW (CAN-MIL) | 553 | Canada | Jan 1943 | Nov 1997 |
| MOOSE JAW (CHAB/AP) | 1397 | Canada | Mar 1894 | Oct 2013 |
| MOOSE JAW CS | 114 | Canada | Jan 2004 | Oct 2013 |
| MOOSE JAW CS, SASK | 142 | Canada | Oct 2001 | Oct 2013 |
| MOOSE LAKE 1 SSE | 1014 | United States | Dec 1913 | Oct 2013 |
| MOOSE LAKE CARLTON AP | 10 | United States | Jan 2005 | Dec 2005 |
| MOOSE LAKE CARLTON C | 146 | United States | Oct 1977 | Oct 2013 |
| MOOSE LAKE MINNESOTA | 121 | United States | Jun 2003 | Oct 2013 |
| MOOSE MTN LO | 10 | Canada | Jun 2004 | Aug 2007 |
| MOOSE PASS 3 NW | 456 | United States | Aug 1941 | Sep 2013 |
| MOOSE PASS 6 NW | 9 | United States | May 1979 | Jan 1980 |
| MOOSE RUN FT RICHA | 52 | United States | Feb 1965 | Nov 1970 |
| MOOSE WALLOW | 192 | Canada | Jul 1982 | Nov 2006 |
| MOOSEHEAD | 228 | United States | Mar 1931 | Oct 2013 |
| MOOSEHORN COOK | 58 | Canada | Jul 1984 | Feb 1993 |
| MOOSEHORN MAINE | 142 | United States | Jul 2001 | Sep 2013 |
| MOOSEHORN,MA | 513 | Canada | Apr 1910 | Oct 1966 |
| MOOSOMIN | 848 | Canada | Feb 1900 | May 2000 |
| MOOSONEE (SAWR) | 109 | Canada | Jan 1982 | Jan 1991 |
| MOOSONEE (SAWR) & | 1534 | Canada | Nov 1877 | Oct 2013 |
| MOOSONEE A | 67 | Clipperton Island | Jul 1957 | May 1996 |
| MOOSONEE RCS /ONT. | 114 | Canada | Jan 2000 | Oct 2013 |
| MOOSONEE, ONT | 318 | Canada | Jul 1977 | Oct 2013 |
| MOPELIA SOCIETY ISLANDS | 293 | French Polynesia [France] | Jan 1955 | Feb 1981 |
| MOPTI | 937 | Mali | Sep 1924 | Oct 2013 |