PO | County | Dates | Comments |
| WAHA | Nez Perce | 1879-1888 | |
| 1890-1941 | |||
| WAINO | Valley | 1906-1907 | |
| WALKER | Shoshone | 1909-1910 | renamed UNION |
| WALLACE | Shoshone | 1886-Date | |
| WALTERS | Canyon | 1888-1898 | |
| WAPELLO | Bingham | 1904-1908 | |
| WAPI | Blaine | 1892-1898 | |
| 1904-1908 | |||
| WARD | Cassia | 1891-1913 | |
| WARDBORO | Bear Lake | 1894-1910 | |
| WARDNER | Shoshone | 1887-1973 | was WORDNER |
| WARM LAKE | Valley | 1940-1960 | SPO |
| WARM RIVER | Fremont | 1907-1917 | |
| 1923-1924 | |||
| WARREN | Idaho | 1885-1983 | was WASHINGTON |
| now CPO | |||
| WARRINERVILLE | Boise | 1865-1867 | renamed HORSE SHOE BEND |
| WARRIOR | Elmore | 1889-1890 | |
| WASHINGTON | Idaho | 1868-1868 | |
| 1870-1885 | renamed WARREN | ||
| WASHOE | Payette | 1873-1875 | |
| 1885-1898 | |||
| WAY | Caribou | 1910-1912 | |
| 1915-1921 | |||
| WAYAN | Caribou | 1894-1988 | now CPO |
| WAYLAND | Owyhee | 1896-1898 | |
| WEBB | Nez Perce | 1901-1921 | |
| WEIPPE | Clearwater | 1887-Date | |
| WEISER | Washington | 1871-1880 | |
| 1883-Date | was WEISER BRIDGE | ||
| WEISER BRIDGE | Washington | 1878-1883 | renamed WEISER |
| WIESER RANCH | Washington | 1866-1870 | |
| WELTY | Bonner | 1909-1910 | renamed DOVER |
| WENDELL | Gooding | 1908-Date | |
| WESLEYAN | Gooding | 1925-1938 | |
| WESTBRANCH | Bonner | 1909-1913 | |
| WESTLAKE | Idaho | 1893-1900 | was MASON |
| 1900-1951 | |||
| WESTMOND | Bonner | 1903-1925 | |
| WESTON | Franklin | 1870-Date | |
| WHITE | Bonner | 1903-1908 | renamed BLANCHARD |
| WHITE BEAR | Clark | 1918-1922 | |
| WHITE BIRD | Idaho | 1866-1874 | |
| 1879-1879 | |||
| 1890-Date | |||
| WHITE KNOB | Custer | 1916-1934 | |
| WHITNEY | Franklin | 1892-1939 | |
| WICKAHONEY | Owyhee | 1894-1911 | |
| WILBERT | Butte | 1914-1915 | |
| WILBURUS | Washington | 1891-1924 | |
| WILDER | Canyon | 1916-Date | was WILDERIA |
| WILDERIA | Canyon | 1916-1916 | renamed WILDER |
| WILDHORSE | Adams | 1907-1952 | |
| WILFORD | Fremont | 1887-1889 | renamed BERRY |
| 1893-1905 | was BERRY | ||
| WILLIAMS | Bonner | 1900-1907 | was COOLIN |
| WILLIAMSBURG | Caribou | 1900-1920 | |
| WILLOLA | Nez Perce | 1899-1912 | |
| WILSON | Owyhee | 1897-1923 | |
| WINCHESTER | Lewis | 1899-Date | |
| WINONA | Idaho | 1906-1945 | was LOWE |
| WINSPER | Clark | 1915-1948 | |
| WOODBINE | Camas | 1882-1885 | |
| WOODFELL | Latah | 1903-1910 | was HOODOO |
| WOODLAND | Idaho | 1898-1957 | |
| WOODLAND | Lemhi | 1887-1889 | |
| WOODROW | Fremont | 1913-1917 | |
| WOODRUFF | Oneida | 1894-1909 | |
| WOODSIDE | Lewis | 1902-1913 | |
| WOODVILLE | Bingham | 1901-1905 | |
| WORDNER | Shoshone | 1886-1887 | renamed WARDNER |
| WORLEY | Kootenai | 1911-Date | |
| WRENCOE | Bonner | 1901-1916 |
Contributed 2021 Oct 05 by Mark Metkin
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