Idaho maps at Digital Commonwealth/Massachusetts Collections Online, includes 1891, 1895, 1897 & 1903 mail routes
Retrieved from Idaho Postal History by Mark Metkin
| PO | Dates | Comments |
| ABERDEEN | 1907-Date | |
| ALRIDGE | 1915-1917 | |
| 1921-1950 | ||
| ATOMIC CITY | 1950-Date | |
| BASALT | 1888-1905 | renamed FIRTH |
| 1905-Date | ||
| BLACKFOOT | 1879-Date | was CENTRAL FERRY |
| county seat | ||
| BRYAN | 1896-1906 | |
| CENTRAL FERRY | 1878-1879 | renamed BLACKFOOT |
| CERRO GRANDE | 1915-1924 | |
| CORBETT'S STATION | 1873-1879 | |
| FIRTH | 1905-1907 | was BASALT |
| 1916-Date | ||
| FORT HALL | 1866-1870 | |
| 1873-1875 | ||
| 1893-1898 | ||
| 1911-1959 | was ROSSFORK | |
| now CPO | ||
| GOSHEN | 1896-1905 | |
| KEEVER | 1916-1918 | renamed MORELAND |
| MORELAND | 1918-Date | was KEEVER |
| OTIS | 1899-1911 | renamed STERLING |
| PINGREE | 1909-Date | |
| PRESTO | 1889-1907 | |
| RICH | 1896-1906 | |
| RIVERSIDE | 1894-1905 | |
| ROSS FORK | 1870-1896 | renamed ROSSFORK |
| ROSSFORK | 1896-1911 | was ROSS FORK |
| renamed FORT HALL | ||
| SHELLEY | 1893-Date | |
| SPRINGFIELD | 1905-1963 | now CPO |
| SPRINGVAIL | 1887-1887 | |
| STERLING | 1911-1978 | was OTIS |
| TABER | 1913-1926 | |
| TAYLOR | 1894-1905 | |
| THOMAS | 1898-1905 | |
| TILDEN | 1894-1910 | |
| TRAILTON | 1916-1921 | |
| WAPELLO | 1904-1908 | |
| WOODVILLE | 1901-1905 | |
| YUMA | 1908-1916 |
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