PO | County | Dates | Comments |
| FAIRBURN | Lewis | 1901-1911 | |
| FAIRFIELD | Camas | 1912-Date | |
| FAIRVIEW | Franklin | 1883-1909 | |
| FAIRVIEW | Owyhee | 1872-1878 | |
| FAIRYLAWN | Owyhee | 1912-1933 | was LOWRY |
| FALCON | Shoshone | 1911-1933 | |
| FALK | Payette | 1910-1922 | was FALK'S STORE |
| FALK'S STORE | Payette | 1871-1910 | renamed FALK |
| FALLS | Adams | 1890-1897 | |
| FALLS | Franklin | 1881-1887 | |
| FALLS CITY | Jerome | 1911-1916 | was COPPDALE |
| FARNUM | Fremont | 1900-1921 | |
| FARRAGUT | Kootenai | 1947-1950 | |
| FEATHERVILLE | Elmore | 1906-1928 | |
| FELT | Teton | 1913-1985 | was BADGER |
| FENN | Idaho | 1915-1957 | was THARP |
| FERDINAND | Idaho | 1898-Date | |
| FERN | Valley | 1902-1913 | renamed SMITHS FERRY |
| FERNWOOD | Benewah | 1902-Date | |
| FERRELL | Benewah | 1902-1905 | renamed SAINT JOE |
| 1908-1921 | |||
| FILER | Twin Falls | 1905-Date | |
| FIR GROVE | Camas | 1912-1913 | |
| FIR GROVE | Kootenai | 1909-1910 | renamed TWIN LAKES |
| FIRTH | Bingham | 1905-1907 | was BASALT |
| 1916-Date | |||
| FISH HAVEN | Bear Lake | 1867-1962 | |
| FISH LAKE | Kootenai | 1909-1915 | |
| FISHER | Custer | 1900-1911 | |
| FISHERIE | Blaine | 1911-1912 | |
| FLETCHER | Lewis | 1896-1910 | |
| FLINT | Owyhee | 1913-1914 | |
| FLORENCE | Idaho | 1871-1879 | |
| 1881-1882 | |||
| 1895-1912 | |||
| FLORENCE CITY | Idaho | 1862-1866 | renamed MEADOW CREEK |
| 1867-1871 | was MEADOW CREEK | ||
| FLORODORO | Fremont | 1902-1903 | |
| FORD | Kootenai | 1911-1930 | |
| FOREST | Lewis | 1893-1948 | |
| FORNEY | Lemhi | 1896-1951 | renamed COBALT |
| FORT HALL | Bingham | 1866-1870 | |
| 1873-1875 | |||
| 1893-1898 | |||
| 1911-1959 | was ROSSFORK | ||
| now CPO | |||
| FORT LEMHI | Lemhi | 1870-1883 | |
| 1887-1902 | renamed HOVER | ||
| FOUR MILE | Latah | 1878-1883 | renamed VIOLA |
| FOX | Teton | 1892-1895 | renamed VICTOR |
| FRANCES | Nez Perce | 1896-1897 | |
| FRANKLIN | Franklin | 1864-Date | |
| FRASER | Clearwater | 1890-1920 | |
| FREEDOM | Caribou | 1891-1915 | in Wyoming |
| 1915-1916 | in Idaho | ||
| 1916-1921 | in Wyoming | ||
| 1921-1926 | in Idaho | ||
| 1926-Date | in Wyoming | ||
| FREEDOM | Idaho | 1880-1898 | |
| 1902-1908 | |||
| FREESE | Latah | 1899-1907 | |
| FREMONT | Fremont | 1903-1907 | |
| FRENCH | Payette | 1907-1935 | |
| FRENCH CREEK | Idaho | 1914-1915 | |
| 1937-1944 | |||
| FRENCH RANCH | Idaho | 1867-1869 | |
| FRITZ | Camas | 1901-1903 | |
| FROST | Custer | 1885-1887 | |
| FRUITLAND | Payette | 1910-Date | |
| FRUITVALE | Adams | 1909-1996 | was LINCOLN |
| FRY | Boundary | 1887-1892 | renamed BONNERS FERRY |
Contributed 2021 Oct 05 by Mark Metkin
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