Retrieved from Idaho Postal History by Mark Metkin
| PO | Dates | Comments |
| AETNA | 1881-1882 | |
| AHSAHKA | 1899-Date | was JOSEPH |
| BIG ISLAND | 1908-1911 | |
| BLAKE | 1900-1913 | was GLENN |
| BLUCHNER | 1905-1906 | |
| CADY | 1890-1890 | |
| CAVENDISH | 1894-1944 | |
| CEDARVILLE | 1890-1898 | |
| DENT | 1896-1954 | |
| ELK RIVER | 1909-Date | was TRUMBULL |
| FRASER | 1890-1920 | |
| GILBERT | 1894-1898 | |
| 1903-1922 | ||
| GLENN | 1885-1891 | |
| 1896-1900 | renamed BLAKE | |
| GRANGEMONT | 1917-1955 | |
| GREER | 1899-1957 | |
| HEADQUARTERS | 1928-1993 | |
| JOSEPH | 1899-1899 | renamed AHSAHKA |
| LEYBURN | 1892-1896 | |
| LOLO | 1882-1884 | |
| 1884-1892 | ||
| MAGILL | 1925-1928 | |
| NEVA | 1916-1918 | |
| ORO FINO | 1862-1864 | |
| OROFINO | 1898-Date | county seat |
| PIERCE | 1894-Date | |
| PIERCE CITY | 1863-1881 | |
| 1882-1887 | ||
| 1887-1892 | ||
| STAUSS | 1896-1896 | |
| TEAKEAN | 1898-1899 | |
| 1899-1940 | ||
| TRUMBULL | 1906-1909 | renamed ELK RIVER |
| WEIPPE | 1887-Date |
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