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
Iantha
Barton
1881-Present
Iatan
Platte
1855-1968
Iberia
Miller
1838-1861, 1871-Present
Icie
Butler
1898-1899
Iconium
Saint Clair
1871-1874, 1878-1959
Ida
Adair
1874-1878
Ida
Livingston
1880-1900
Ida
Washington
1914-1915
Idaho
Adair
1871-1873
Idalia
Stoddard
1889-1966
Idlewild
Stoddard
1884
Idumea
Douglas
1890-1912
Igo
Vernon
1881-1886
Igo
Ozark
1892-1914
Ike
Taney
1920-1927
Ilasco
Ralls
1919-1960
Ilia
Mercer
1881-1906
Illmo
Scott
1904-Present
Imperial
Jefferson
1951-Present
Impo
Texas
1919-1955
INDEPENDENCE
Jackson
1827-Present
Index
Cass
1874-1903
Indian Creek
Franklin
1828-1830E
Indian Creek
Monroe
1839-1906
Indian Ford
Stoddard
1854-1864, 1867-1872
Indian Grove
Chariton
1878-1906
Indian Springs
Mc Donald
1881-1901
Industrial City
Buchanan
1924-1964
Industry
Scotland
1861-1863
Industry
Henry
1881-1887
Ingalls
Polk
1890-1914
Ingleside
Oregon
1857-1858
Ingram
Greene
1900-1903
Ink
Shannon
1885-1954
Inkerman
Schuyler
1855-1859
Inlow
Butler
1891-1894
Ino
Christian
1882-1883
Inza
Buchanan
1902-1915
Ioka
Jasper
1851-1864, 1867-1869
Iona
Cape Girardeau
1877-1879
Ionia
Pettis
1895-1904
Ionia
Benton
1904-Present
Ionia City
Pettis
1867-1895
Iono
Barton
1886-1890
Ipsara
Carroll
1834-1835
Ira
Laclede
1899-1949
Irena
Worth
1883-1932
Iris
Linn
1900-1901
Irish Grove
Atchison
1850-1877
Irma
Taney
1901-1911
Iron Fork
Ozark
1872-1873
Iron Hill
Franklin
1856-1860
Iron Hill
Shannon
1856
Iron Mountain
Saint Francois
1846-1894, 1906-Present
Iron Ridge
Crawford
1872-1881
Iron Summit
Pulaski
1872-1879
Irondale
Washington
1859-Present
IRONTON
Iron
1858-Present
Irwin
Barton
1884-Present
Isabella
Ozark
1856-1864, 1867-Present
Isabelle Station
Osage
1869
Isadora
Worth
1866-1951
Isbell Station
Osage
1889-1941
Ishmael
Washington
1929-1953
Island City
Gentry
1858-1906
Isle au Bois
Jefferson
1834-1835, 1852-1859
Isle au Bois
Ste. Genevieve
1834
Isle Bois
Ste. Genevieve
1837-1839
Ithaca
Stoddard
1893-1894
Iuka Springs
Saint Clair
1887-1903
Ivanhoe
Shelby
1873-1883
Ivy
Wayne
1886-1887
Ivy
Cedar
1888-1908
73 Post Offices entered in the letter “I”
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Updated on 27 Nov 2009 23:28:50.
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Missouri Postal History Society, St. Louis, Missouri.