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
Udall
Ozark
1885-Present
Ulah
Gentry
1898-1903
Ulam
Ste. Genevieve
1889-1907
Ulf
Phelps
1893-1902
Ulman
Miller
1895-Present
Ulman’s Ridge
Miller
1857-1861, 1866-1895
Umber
Cedar
1897-1907
Umber
Cedar
1897-1907
Umpire
Wright
1884-1910
Una
Marion
1898-1901
Underwood
Reynolds
1888-1895
Undine
Howell
1880-1882
Undine
Washington
1891-1932
Undine
Washington
1891-1932
UNION
Franklin
1827-Present
Union City
Atchison
1871-1873
Union Grove
Newton
1840-1848
Union Grove
Jasper
1848-1849
Union Grove
Gentry
1866-1894
Union Hill
Greene
1861-1862
Union Mills
Platte
1856-1861, 1866-1871
Union Point
Jackson
1854-1857
Union Ridge
Sullivan
1864-1884
Union Star
De Kalb
1863-Present
Union Valley
Nodaway
1873-1880
Uniongrove
Gentry
1894-1900
Uniontown
Clark
1863-1865
Uniontown
Perry
1868-1965
UNIONVILLE
Putnam
1854-Present
Unis
Douglas
1906
Unity
Scotland
1857-1859, 1875-1907
Upalika
Wayne
1892-1894, 1899-1927
Upshaw
Douglas
1892-1895
Upton
Butler
1886-1887
Upton
Scotland
1890-1892
Upton
Texas
1907-1975
Urbana
Hickory
1848-1856
Urbana
Dallas
1856-Present
Urich
Henry
1872-Present
Ursa
Wayne
1894-1904
Useful
Osage
1881-1889, 1906-1918
Utica
Livingston
1837-Present
Utter
Ralls
1886-1890
43 Post Offices entered in the letter “U”
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Updated on 27 Nov 2009 23:28:53.
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Missouri Postal History Society, St. Louis, Missouri.