County seats are displayed in UPPER CASE. Note: Information about zip codes, territorials, markings, etc. have been moved to detail pages for places that have links.
Post Office County Dates of Service
Mabel
Daviess
1883-1936
Mabry’s Ferry
Stone
1871-1878
Maccosonville
Cape Girardeau
1854-1855
Macedonia
Phelps
1890-1917
Machens
Saint Charles
1895-1956
Mack Fall
Gentry
1879
Mackie
Andrew
1884
Mackie
Franklin
1887-1896
Macks Creek
Camden
1872-Present
Mackville
Lincoln
1877-1902
Macomb
Wright
1886-Present
Macon
Jasper
1842-1845
MACON
Macon
1892-Present
Macon City
Macon
1856-1892
Macy
Saint Clair
1904-1905
Maddix
Dallas
1908-1911
Madelaine
Daviess
1890-1903
Madge
Mc Donald
1891-1903
Madison
Monroe
1837-Present
Madisonville
Ralls
1838-1906
Madry
Barry
1892-1918
Magill
Daviess
1900-1903
Magnet
Atchison
1880-1900
Magnolia
Clinton
1853-1855
Magnolia
Moniteau
1868-1875
Magnolia
Johnson
1896-1953
Magnolia Centre
Lawrence
1868-1871
Magoffin
Pettis
1872
Mahan
Texas
1903-1912
Mahan’s Creek
Shannon
1860-1867
Mahaska
Harrison
1894-1895
Maiden
Callaway
1891-1895
Main City
Cass
1879-1906
Mainard
Douglas
1903-1920
Maitland
Holt
1880-Present
Major
Clinton
1882-1889
Malcolm
Chariton
1885-1888
Malden
Dunklin
1877-Present
Malone
Texas
1905-1913
Malta Bend
Saline
1860-1861, 1866-Present
Malty
Barton
1890-1901
Mammoth
Ozark
1902-1955
Mammoth Springs
Reynolds
1852
Mammoth Springs
Oregon
1857-1860
Manchester
Saint Louis
1824-1902, 1904-1963
Manda
Gasconade
1901-1908
Mandeville
Carroll
1854-1903
Manes
Wright
1890-1977
Manila
Pettis
1898-1904
Manley
Dunklin
1908-1918
Manlius
Carroll
1841-1845, 1853-1861
Mann
Iron
1899-1917
Manning
Scott
1893-1903
Mano
Barry
1890-1939
Manor
Saint Charles
1840-1841
Mansfield
Wright
1882-Present
Manton
Maries
1860-1894
Many Springs
Oregon
1875-1907
Map
Shannon
1917-1936
Mapaville
Jefferson
1949-Present
Maple
Macon
1875-1887
Maple
Dallas
1903
Maple Grove
Jasper
1879-1894
Maple Park
Clay
1922-1935
Maplegrove
Jasper
1894-1901
Maples
Texas
1891-1901, 1903-1967
Mapleton
Putnam
1891-1909
Maplewood
Saint Louis
1892-1901
Marais
Gasconade
1839-1848
Marais
Osage
1848-1855
Marais
Maries
1855
Maramec
Crawford
1827-1873E
Maramec Iron Works
Crawford
1827-1873E
Marble Creek
Iron
1858-1862, 1866-1872, 1879-1883
MARBLE HILL
Bollinger
1868-Present
Marblecreek
Iron
1902-1904
Marblecreek
Madison
1904-1905
Marcelline
Linn
1887-Present
March
Dallas
1888-1915
Marco
Stoddard
1905-1914
Marcoot
Reynolds
1905-1938
Margaret
Gasconade
1895-1908
Marietta
Jasper
1849-1850
Marietta
Gentry
1857-1858
Marion C.H.
Cole
1823-1953
Marion City
Marion
1837-1861
Marion College
Marion
1833-1844
Marionville
Lawrence
1864-Present
Mark
Daviess
1877-1878
Mark
Marion
1914-1927
Marlin
Pettis
1873-1878
Marling
Montgomery
1894-1954
Marmaduke
Saline
1827-1829
Marmaduke
Barry
1886-1890
Marmaros
Stone
1886-1929
Marmiton
Bates
1848-1849
Marquand
Madison
1870-Present
Marsden
Washington
1875-1876
Marsh Creek
Madison
1921-1932
MARSHALL
Saline
1840-Present
MARSHFIELD
Webster
1856-Present
Marston
New Madrid
1898-Present
Martha
Buchanan
1895-1896
Martha
Reynolds
1898-1908
Marthasville
Montgomery
1818-1825
Marthasville
Warren
1825-Present
Martin
Greene
1861-1869
Martin City
Jackson
1888-1963
Martins Mills
Buchanan
1849-1851
Martinsburgh
Saline
1829-1830
Martinsburgh
Ripley
1842-1844, 1847-1867
Martinsburgh
Audrain
1870-Present
Martinstown
Putnam
1857-1900
Martinsville
Clay
1837-1839
Martinsville
Harrison
1868-Present
Martling
Newton
1873-1880
Marvel
Bates
1848-1864, 1866-1883
Marvin
Henry
1870-1887
Marvin
Texas
1899-1901
Marvin
Morgan
1904-1938
Mary’s Home
Miller
1884-1918
Maryden
Washington
1898-1903
Maryland Heights
Saint Louis
1925-1960
MARYVILLE
Nodaway
1846-Present
Marzolf
Pike
1898-1901
Mascott
Greene
1892-1904
Mashek
Lincoln
1888-1905
Mason
Clinton
1838-1843
Mason
Platte
1843-1845
Mason
Newton
1891-1892
Masonic College
Marion
1844-1847
Massie
Shannon
1883-1884
Mast
Butler
1891-1895
Masters
Cedar
1899-1907
Mathis
Dallas
1903-1905
Matkins
Harrison
1880-1907
Matneys
Webster
1890-Present
Matson
Saint Charles
1893-1971
Mattese
Saint Louis
1853-1869, 1882-1887, 1889-1902, 1904-1907
Matthews
Jackson
1871-1872
Matthews
New Madrid
1903-Present
Matthews Prairie
Scott
1828-1846
Matthews Prairie
Mississippi
1846-1847
Mattis
Saint Louis
1876
Maud
Shelby
1880-1903
Maunes Store
Franklin
1871-1883
Maupin
Franklin
1896-1942
Maurine
Henry
1885-1909
Max
Dent
1912-1954
Max Creek
Camden
1854-1860
Maxville
Jefferson
1873-1905
May
Mc Donald
1884-1907
May Apple
Laclede
1857-1859
Mayberry
Lewis
1849-1852
Mayesburgh
Bates
1879-1902
Mayfield
Bollinger
1882-1891, 1899-1909, 1912-1955
Mayflower
Barry
1887-1910
MAYSVILLE
De Kalb
1846-Present
Mayview
Lafayette
1865-Present
Maywood
Lewis
1872-Present
Mc Allister
Pettis
1881
Mc Allister
Saline
1881-1885, 1896-1907
Mc Baine
Boone
1894-1958
Mc Bride
Perry
1905-1961
Mc Cabe
Ozark
1894-1896, 1905-1924
Mc Cartney’s Cross Roads
De Kalb
1873-1886
Mc Clains Creek
Lincoln
1835-1838
Mc Clains Mills
Ray
1858-1860
Mc Clure
Barry
1891
Mc Clurg
Johnson
1871-1876
Mc Clurg
Taney
1894-2002
Mc Connell’s
Saint Charles
1827-1829E
Mc Cord
Stone
1888-1893
Mc Cormic
Jefferson
1890-1901
Mc Coy
Buchanan
1894-1895
Mc Cracken
Christian
1896-1932
Mc Credie
Callaway
1872-1970
Mc Cunes Station
Pike
1879-1920
Mc Curry
Gentry
1881-1901
Mc Doe
Reynolds
1888-1903
Mc Donald
Barry
1840-1851, 1854
Mc Dowell
Barry
1858-1868, 1872-1925
Mc Elhany
Newton
1896-1911
Mc Fall
Gentry
1879-Present
Mc Farland
Taney
1901-1911
Mc Gee
Jackson
1881-1883
Mc Gee
Wayne
1906-Present
Mc Ginty
Mc Donald
1906-1907
Mc Girk
Moniteau
1881-Present
Mc Grath
Laclede
1887-1895
Mc Guire
Dunklin
1905-1914
Mc Harques
Chariton
1838-1845
Mc Henry
Laclede
1893-1896
Mc Ilroy
Ripley
1894-1895
Mc Kinley
Lawrence
1891-1910
Mc Kinney’s Mill
Ripley
1877-1888
Mc Kittrick
Montgomery
1894-1967
Mc Knight
Osage
1880-1889
Mc Lelland’s Springs
Cass
1890-1896
Mc Mullin
Randolph
1880-1889
Mc Mullin
Scott
1903-1924
Mc Nail
Iron
1875-1883
Mc Natt
Mc Donald
1901-1907
Mc Neal
Lawrence
1903-1904
Mc Pherson
Adair
1880-1888
Meade
Linn
1854-1856
Meadland
Benton
1866-1868
Meadow
Cedar
1884-1891
Meadville
Linn
1869-Present
Mecca
Clinton
1898-1912
Mechanicsburg
Macon
1847-1858
Medford
Johnson
1905-1910, 1912-1937
Media
Bates
1874-1875
Medical Springs
Randolph
1881-1888
Medicine
Sullivan
1870-1883
Medicine
Livingston
1892-1895
Medicine Creek
Livingston
1837-1845
Medill
Clark
1889-1975
Medley
Mississippi
1880-1913, 1916-1927
Medoc
Jasper
1854-1864, 1866-1927
Medora
Osage
1858-1893
Mehlville
Saint Louis
1876-1902, 1904
Meinert
Dade
1890-1907
Melbourne
Harrison
1897-1966
Melissa
Ozark
1856-1862, 1869-1875
Mellville
Wright
1872-1873
Melrose
Saint Louis
1858-1904
Melva
Taney
1906-1931
Melville
Dade
1853-1858
Melvin
Benton
1896-1899
Melzo
Jefferson
1906-1938
Memphis
Lewis
1838-1841
MEMPHIS
Scotland
1841-Present
Mendon
Chariton
1872-Present
Mendota
Putnam
1858-1859, 1866-1947
Menfro
Perry
1904-1996
Mentor
Christian
1895-1896, 1898-1900
Mentor
Greene
1896-1898
Meramec
Phelps
1873-1886, 1888
Meramec Highlands
Saint Louis
1892-1907
Mercer
Mercer
1855-1871, 1880-Present
Mercyville
Macon
1867-1889
Merimec
Crawford
1894-1900
Merimec
Phelps
1900-1915
Merrellsville
Marion
1837-1843
Merrellsville
Lewis
1843-1844
Merrill
Webster
1896-1898
Merrimack
Crawford
1848
Merrimack Mill
Crawford
1848-1849
Merritt
Douglas
1903-1930
Merwin
Bates
1891-1969
Messler
Stoddard
1912-1939
Meta
Osage
1903-Present
Metalbound
Mississippi
1905-1907
Metcalf
Pulaski
1890-1892
Metz
Vernon
1870-Present
MEXICO
Audrain
1837-Present
Meyers Store
Franklin
1874-1891
Miami
Saline
1838-Present
Miami Station
Carroll
1869-1951
Micklin
Jackson
1868-1878
Micola
Pemiscot
1902-1926
Midco
Carter
1918-1932
Middle Fabius
Scotland
1841-1890
Middle Fork
Macon
1839-1858
Middle Grove
Ralls
1829-1835
Middle Grove
Monroe
1835-1894
Middle Ridge
Harrison
1872-1873
Middlebrook
Iron
1858-Present
Middleburg(h)
Boone
1850-1855, 1858
Middlebury
Mercer
1847-1869, 1875-1878
Middlebury
Grundy
1869-1875
Middlegrove
Monroe
1894-1907
Middletown
Montgomery
1832-1835, 1837-Present
Midland
Crawford
1875-1896
Midland
Saint Louis
1900-1903
Midridge
Shannon
1931-1964
Midway
Cooper
1843-1864
Midway
Moniteau
1864-1866
Midway
Boone
1869-1908
Mier
Madison
1851-1858
Mike
Chariton
1890-1906
MILAN
Sullivan
1847-Present
Milburn
Boone
1892-1894
Mildred
Taney
1910-1934
Miles Point
Carroll
1858-1903
Milford
Scotland
1841-1850
Milford
Johnson
1855-1863
Milford
Barton
1869-Present
Mill
Ste. Genevieve
1882-1906
Mill Bluff
Camden
1863-1864
Mill Creek
Ripley
1837-1865
Mill Grove
Madison
1850-1856
Mill Grove
Mercer
1873-1974
Mill Port
Knox
1858-1895
Mill Spring
Saint Louis
1865-1873
Mill Spring
Wayne
1874-Present
Millard
Adair
1870-1942
Millbrook
Cole
1893-1911
Millcreek
Madison
1909-1976
Miller
Lawrence
1891-Present
Millers Landing
Franklin
1855-1858
Millersburg
Callaway
1830-1953
Millersville
Cape Girardeau
1866-Present
Millford
Lewis
1840-1841
Millheim
Perry
1889-1938
Millport
Knox
1898-1901
Millville
Morgan
1834-1835
Millville
Ray
1849-1906
Millwood
Lincoln
1842-1903
Milo
Vernon
1883-Present
Milton
Randolph
1840-1872
Milton
Atchison
1877-1908
Miltondale
Clay
1895-1906
Minaville
Clay
1881, 1885, 1891-1909
Mincke
Saint Louis
1909-1910
Mincy
Taney
1870-1955
Minden
Lawrence
1860-1873
Minden
Warren
1899
Minden Mines
Barton
1884-1895
Mindenmines
Barton
1895-Present
Mine au Breton
Washington
1811-1824
Mine La Motte
Madison
1840-1861, 1867-1911, 1931E-Present
Mine Lamotte
Madison
1911-1931E
Mine Shibboleth
Washington
1823-1832E
Mineola
Montgomery
1881-1967
Miner’s
Washington
1847-1850
Mineral Point
Washington
1858-Present
Mineral Spring
Barry
1900-1940
Mineralspring
Barry
1895-1900
Minersville
Jasper
1858-1859
Minerva
Morgan
1857-1861
Minerville
Christian
1868-1874
Ming Spring
Wright
1871-1872
Mingo
Bates
1871-1872
Mingo
Wayne
1894-1896
Mingo
Stoddard
1899-1905, 1909-1952
Mingville
Wright
1871-1886, 1890-1918
Minimum
Iron
1904-1955
Mining
Morgan
1852-1872, 1883-1886
Minner
Scott
1893-1895
Minnie
Boone
1901-1907
Minnith
Ste. Genevieve
1877-1878, 1884-1963
Mint
Wright
1889-1910
Mint Hill
Osage
1870-1909, 1926-1954
Mint Spring
Wright
1854-1868, 1871-1872
Mirabile
Caldwell
1849-1941
Mission
Polk
1899-1905
Missouri City
Clay
1867-Present
Missouri State University
Boone
1877-1880
Missouriton
Carroll
1820-1821
Missouriton
Saint Charles
1833-1880
Mistletoe
Saint Francois
1905-1909
Mitch
Oregon
1893-1905
Mitchell
Phelps
1895-1911
Mitchellville
Harrison
1865-1888
Mize
Dunklin
1883
Moab
Pulaski
1891-1929
Moark
Dunklin
1900-1905
Moberly
Randolph
1869-Present
Moccasin Springs
Cape Girardeau
1903-1909
Mock’s Store
Jackson
1878-1879
Mockersonville
Cape Girardeau
1868
Mockville
Cass
1854-1855
Modena
Mercer
1858-1907, 1917-1972
Modesty
New Madrid
1882-1883
Modoc
Audrain
1874-1883
Mohawk
Polk
1899-1916
Mokane
Callaway
1893-Present
Mokeville
Saint Louis
1872-1879
Molino
Franklin
1856-1857
Mollie
Cedar
1896-1906
Monagan
Saint Clair
1847-1864, 1866-1871
Monarch
Saint Louis
1895-1907
Monarch
Laclede
1914-1928
Moncon
Johnson
1892
Monday
Franklin
1900-1908
Monegaw Springs
Saint Clair
1888-1953
Monett
Barry
1887-Present
Moniteau
Cole
1830-UNK
Moniteau
Moniteau
UNK-1850, 1882-1884
Monitor
Putnam
1899-1900
Monroe
Lincoln
1819-1823
Monroe City
Monroe
1860-Present
Monroe Court House
Monroe
1831-1841
Montague
Christian
1905-1908
Montana
Iron
1880-1904
Montauk
Crawford
1844-1851
Montauk
Dent
1851-1857, 1868-1974
Montauk
Texas
1857-1867
Montay
Carter
1911
Monteer
Shannon
1889-1924
Monterey
Reynolds
1894-1957
Montevallo
Bates
1854-1858
Montevallo
Vernon
1858-1865, 1867-1968
MONTGOMERY CITY
Montgomery
1857-Present
MONTICELLO
Lewis
1834-Present
Montier
Shannon
1924-Present
Montreal
Camden
1861-Present
Montrose
Henry
1870-Present
Montserrat
Johnson
1872-1954
Moody
Howell
1880-Present
Moore
Mercer
1897-1902
Mooreland
Scott
1900
Mooresville
Livingston
1860-Present
Moorham
Crawford
1834
Mora
Pettis
1877-1882
Mora
Benton
1882-Present
Morad
Barton
1882-1883
Moral
Mc Donald
1904-1908
Moreau
Cole
1837-1848
Morehead City
Cedar
1869
Morehouse
New Madrid
1888-Present
Morerod
Barton
1883-1886
Morgan
Adair
1861-1862
Morgan
Laclede
1896-1975
Morgans Grove
Pulaski
1879-1883
Morganville
Polk
1891-1894
Morley
Scott
1869-Present
Mormon’s Fork
Vernon
1852-Present
Mornington
Webster
1856-1883
Morrelton
Franklin
1893-1953
Morris Chapel
Harrison
1874-1875
Morris Ridge
Harrison
1870-1872
Morrison
Gasconade
1860-Present
Morristown
Van Buren
1848-1849
Morristown
Cass
1849-1862, 1867-1871
Morrisville
Polk
1872-Present
Morrow
Macon
1899-1901
Morse(’s) Mill
Jefferson
1859-Present
Morsey
Warren
1891-1908
Morton
Ray
1874-1904
Mosby
Johnson
1876
Mosby
Clay
1887-2005
Moscow
Lincoln
1821-1823
Moscow
Greene
1860-1867
Moscow
Clay
1874-1904
Moscow Mills
Lincoln
1878-Present
Moselle
Franklin
1860-1863, 1865-1971
Moselle Furnace
Franklin
1851
Mosier
Camden
1907-1919
Mosley
Johnson
1876
Moss
Lafayette
1846-1861
Moss
Jefferson
1892-1893
Moss
Reynolds
1894-1900, 1911-1917
Mott
Howell
1892-1911
Moulton
Shelby
1875-1884
Mounce
Dent
1892-1913
Mound
Carroll
1842-1848, 1857-1858
Mound City
Holt
1871-Present
Mounds
Vernon
1870-1886
Moundville
Vernon
1886-Present
Mount Airy
Randolph
1831-1854, 1865-1902
Mount Carmel
Cooper
1839-1858
Mount Carmel
Audrain
1881-1931
Mount Enterprise
Cedar
1872-1873
Mount Helicon
Franklin
1856-1860
Mount Hope
Lafayette
1833-1854, 1860-1861, 1865-1879
Mount Hulda
Benton
1916-1924
Mount Hullock
Franklin
1862-1863
Mount Leonard
Saline
1878-1957
Mount Meredian
Pulaski
1850-1852
Mount Moriah
Harrison
1867-1983
Mount Pleasant
Pike
1830-1835
Mount Pleasant
Barry
1836-1846
Mount Pleasant
Lawrence
1846-1857
Mount Pleasant
Gentry
1862-1879
Mount Prairie
Ralls
1825-1835
Mount Refuge
Clinton
1842-1849
Mount Sterling
Gasconade
1843-1864, 1893-1965, Contract-Present
Mount Tabor
Lafayette
1874-1876
MOUNT VERNON
Lawrence
1820-1823E, 1846-Present
Mount Vernon
Barry
1837-1841
Mount Vernon
Dade
1841-1846
Mount View
Benton
1848-1895
Mount Washington
Jackson
1890-1928
Mount Zion
Henry
1873-1876, 1878-1883, 1885-1910
Mountain
Mc Donald
1879-1914
Mountain Cove
Barry
1872-1874
Mountain Grove
Wright
1875-Present
Mountain View
Howell
1879-Present
Mounthope
Franklin
1903-1909
Mountolive
Ozark
1911-1915
Mouth of Sac
Rives
1837-1839
Muddy
Caldwell
1875-1877
Muddy Fork
Knox
1856-1859
Muddy Lane
Livingston
1868-1901
Mudville
Phelps
1903-1905
Muirton
Grundy
1871-1892
Mulberry
Bates
1870-1904
Mule Creek
Cedar
1856-1869
Muleshoe
Boone
1888-1889
Mulloy’s Station
Polk
1859-1860
Mumford
Greene
1887-1924
Munger
Iron
1884, 1901-1907
Munger
Reynolds
1884-1901, 1907-1932
Mungers Mill
Shannon
1840-UNK
Mungers Mill
Reynolds
UNK-1872
Mungy
Phelps
1906-1908
Murphy
Jefferson
1894-1906
Murphy’s Settlement
Saint Francois
1817-1823
Murphysburgh
Jasper
1872-1877
Murry
Boone
1893-1907
Muscle Fork
Chariton
1870-1895
Muscle Mills
Sullivan
1860-1864
Musick
Callaway
1890-1907
Myers
Howard
1859-1905
Myetta
Camden
1900-1904
Myrtle
Knox
1863-1873
Myrtle
Oregon
1884-Present
Mystic
Sullivan
1898-1903
511 Post Offices entered in the letter “M”
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Updated on 27 Nov 2009 23:28:51.
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Missouri Postal History Society, St. Louis, Missouri.