PO | County | Dates | Comments |
| NAF | Cassia | 1898-1971 | |
| NAMPA | Canyon | 1887-Date | |
| NAPLES | Boundary | 1892-Date | |
| NAPLES | Lincoln | 1882-1883 | renamed SHOSHONE |
| NEAL | Elmore | 1894-1899 | |
| NEELEY | Power | 1902-1912 | |
| 1912-1918 | |||
| NEELY | Power | 1886-1888 | |
| NELSON | Oneida | 1910-1916 | |
| NEPHUR | Bear Lake | 1883-1891 | |
| NETTIE | Elmore | 1906-1908 | |
| NEVA | Clearwater | 1916-1918 | |
| NEW MEADOWS | Adams | 1911-Date | |
| NEW PLYMOUTH | Payette | 1896-Date | |
| NEW WEISER | Washington | 1884-1884 | |
| NEWDALE | Fremont | 1916-Date | |
| NEWELL | Canyon | 1910-1911 | renamed BOWMONT |
| NEWMAN | Bonner | 1904-1914 | |
| NEWPORT | Bonner | 1891-1900 | in Idaho |
| 1900-Date | in Washington | ||
| NEWSOM CREEK | Idaho | 1871-1873 | |
| 1873-1875 | |||
| NEWSOME | Idaho | 1896-1927 | |
| NEZPERCE | Lewis | 1896-Date | |
| NICHOLIA | Lemhi | 1884-1916 | |
| 1930-1937 | |||
| NINE MILE | Bannock | 1879-1879 | |
| NITER | Caribou | 1904-1918 | was HANNA |
| NOBLE | Lemhi | 1900-1904 | |
| NOONDA | Blaine | 1890-1922 | |
| NORA | Latah | 1900-1906 | |
| NORDMAN | Bonner | 1915-Date | |
| NORTH FORK | Lemhi | 1910-Date | |
| NORTON | Elmore | 1907-1909 | |
| NORTON | Franklin | 1898-1905 | |
| NORWOOD | Valley | 1915-1941 | |
| NOTUS | Canyon | 1886-1887 | |
| 1904-Date | was LEMP | ||
| NOUNAN | Bear Lake | 1882-1883 | |
| 1898-1966 |
Contributed 2021 Oct 05 by Mark Metkin
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