PO | County | Dates | Comments |
| EAGLE | Ada | 1908-Date | |
| EAGLE | Shoshone | 1884-1888 | |
| EAGLE ROCK | Bonneville | 1866-1868 | renamed MARKET LAKE |
| 1869-1890 | renamed IDAHO FALLS | ||
| EAKIN | Idaho | 1906-1909 | |
| EARNCLIFF | Cassia | 1886-1890 | |
| EASTPORT | Boundary | 1906-1909 | |
| 1910-Date | |||
| EATONS | Washington | 1916-1924 | |
| ECHO | Elmore | 1898-1903 | |
| EDEN | Jerome | 1912-Date | |
| EDGEMERE | Bonner | 1913-1960 | |
| EDIE | Clark | 1906-1915 | |
| EDMUNDS | Fremont | 1889-1905 | was BRIGHTON |
| EDNA | Boise | 1893-1898 | |
| 1909-1911 | |||
| EDWARDSBURG | Valley | 1909-1918 | was LOGAN |
| EGIN | Fremont | 1880-1894 | renamed PARKER |
| 1894-1907 | |||
| EIGHTMILE | Bear Lake | 1906-1907 | |
| EILEEN | Boundary | 1912-1914 | |
| ELBA | Cassia | 1883-1996 | |
| ELDORADO | Boise | 1905-1914 | |
| ELGIN | Benewah | 1898-1899 | |
| ELIZABETH | Lincoln | 1882-1883 | |
| ELK CITY | Idaho | 1862-1869 | |
| 1871-1881 | |||
| 1882-1883 | |||
| 1888-Date | |||
| ELK PAIRIE | Shoshone | 1909-1911 | |
| ELK RIVER | Clearwater | 1909-Date | was TRUMBULL |
| ELKHORN | Oneida | 1898-1902 | |
| ELLIS | Custer | 1890-1894 | |
| 1896-1899 | |||
| 1904-1906 | |||
| 1918-Date | |||
| ELLIS | Lemhi | 1899-1904 | |
| 1906-1918 | |||
| ELMIRA | Bonner | 1892-1894 | was HALFWAY |
| 1900-1954 | now CPO | ||
| ELO | Valley | 1905-1909 | renamed MCCALL |
| ELVA | Bonneville | 1898-1900 | renamed AKO |
| EMERALD | Shoshone | 1923-1929 | |
| EMIDA | Benewah | 1898-1967 | |
| EMMETT | Gem | 1885-Date | was EMMETTSVILLE |
| EMMETTSVILLE | Gem | 1868-1869 | |
| 1870-1885 | renamed EMMETT | ||
| ENAVILLE | Shoshone | 1891-1893 | |
| 1903-1976 | |||
| ENTERPRISE | Owyhee | 1894-1917 | renamed GIVENS SPRINGS |
| ERA | Butte | 1885-1894 | |
| ESMERALDA | Elmore | 1864-1868 | operated as ROCKY BAR |
| renamed ROCKY BAR | |||
| ETHELS | Elmore | 1880-1882 | |
| EUGENE | Valley | 1891-1893 | |
| EUREKA | Ada | 1898-1899 | |
| EVANS | Elmore | 1906-1907 | |
| EVERGREEN | Adams | 1905-1906 | renamed STARKEY |
| EVOLUTION | Shoshone | 1887-1888 |
Contributed 2021 Oct 05 by Mark Metkin
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