PO | County | Dates | Comments |
| LABELLE | Jefferson | 1889-1906 | |
| LACLEDE | Bonner | 1901-Date | was MARKHAM |
| LACROSSE | Kootenai | 1904-1910 | renamed GIBBS |
| LAGO | Caribou | 1887-1954 | |
| LAKE | Fremont | 1889-1941 | |
| LAKE FORK | Valley | 1934-1984 | |
| LAKEVIEW | Bonner | 1890-1944 | |
| LAMONT | Fremont | 1915-1972 | |
| LANARK | Bear Lake | 1894-1896 | |
| LANDING | Power | 1898-1914 | |
| LANDORE | Adams | 1901-1920 | |
| LANE | Kootenai | 1891-1892 | |
| 1896-1956 | |||
| LAPHAM | Madison | 1885-1887 | |
| LAPWAI | Nez Perce | 1868-1884 | |
| 1894-Date | |||
| LARDO | Valley | 1889-1917 | |
| LARSON | Shoshone | 1907-1912 | |
| 1912-1916 | |||
| LATAH | Latah | 1889-1890 | renamed KENDRICK |
| LAVA | Bannock | 1890-1895 | |
| LAVA | Jefferson | 1879-1884 | renamed CAMAS |
| LAVA HOT SPRINGS | Bannock | 1915-Date | was DEMPSEY |
| LEADORE | Lemhi | 1911-Date | |
| LEBANON | Nez Perce | 1898-1899 | |
| LEDUC | Blaine | 1886-1887 | |
| 1887-1900 | renamed PICABO | ||
| LEESBURG | Lemhi | 1894-1900 | was LEESBURGH |
| 1901-1942 | was HUNT | ||
| LEESBURGH | Lemhi | 1869-1878 | |
| 1880-1894 | renamed LEESBURG | ||
| LEIGH | Teton | 1896-1906 | renamed CLAWSON |
| LELAND | Cassia | 1881-1883 | |
| LELAND | Nez Perce | 1888-1942 | |
| LEMHI | Lemhi | 1911-Date | |
| LEMHI AGENCY | Lemhi | 1877-1879 | |
| 1883-1907 | |||
| LEMP | Canyon | 1901-1904 | was LOWER BOISE |
| renamed NOTUS | |||
| LENIA | Boundary | 1901-1923 | was LEONAI |
| renamed LEONIA | |||
| LENLANDING | Kootenai | 1897-1905 | |
| LENORE | Nez Perce | 1900-Date | |
| LENOX | Elmore | 1906-1924 | |
| LENVILLE | Latah | 1890-1901 | |
| LEONA | Cassia | 1885-1888 | |
| LEONAI | Boundary | 1892-1901 | renamed LENIA |
| LEONIA | Boundary | 1923-1954 | was LENIA |
| LEORIN | Bonneville | 1892-1910 | |
| LESLIE | Custer | 1888-1980 | |
| LETHA | Gem | 1911-1996 | now CPO |
| LEVEL | Jefferson | 1915-1935 | |
| LEWISTON | Nez Perce | 1862-Date | |
| LEWISVILLE | Jefferson | 1886-1889 | |
| 1893-Date | was TAYLOR | ||
| LEYBURN | Clearwater | 1892-1896 | |
| LIBERTY | Bear Lake | 1867-1920 | |
| LIDYVILLE | Latah | 1879-1883 | |
| LILLIAN | Fremont | 1906-1915 | |
| LINCOLN | Adams | 1909-1909 | renamed FRUITVALE |
| LINDEN | Latah | 1889-1929 | |
| LINDSAYVILLE | Bear Lake | 1905-1909 | |
| LINFOR | Shoshone | 1916-1918 | |
| 1919-1925 | |||
| LITTLE CAMAS | Elmore | 1899-1912 | |
| LITTLE KAMAS | Elmore | 1866-1868 | |
| LITTLEFIELD | Shoshone | 1884-1889 | |
| LOCUST | Cassia | 1903-1908 | |
| LODI | Fremont | 1896-1907 | |
| LOGAN | Valley | 1904-1909 | renamed EDWARDSBURG |
| LOLO | Clearwater | 1882-1884 | |
| 1884-1892 | |||
| LOOKOUT | Nez Perce | 1901-1916 | was BEEMAN |
| LOON CREEK | Custer | 1872-1873 | |
| LORENA | Idaho | 1902-1903 | was KOOSKIA |
| renamed KUPRO | |||
| LORENZO | Jefferson | 1901-1973 | |
| LOST RIVER | Butte | 1885-1912 | |
| LOWE | Idaho | 1898-1906 | renamed WINONA |
| LOWELL | Idaho | 1908-1943 | was SYRINGA |
| LOWER BOISE | Canyon | 1869-1873 | |
| 1874-1882 | |||
| 1894-1901 | renamed LEMP | ||
| LOWMAN | Boise | 1903-1966 | now CPO |
| LOWRY | Owyhee | 1902-1912 | renamed FAIRYLAWN |
| LUCAS | Boundary | 1892-1898 | |
| LUCERNE | Jefferson | 1904-1907 | |
| LUCILE | Idaho | 1899-Date | |
| LUND | Caribou | 1898-1962 | was HAWLEY |
| LUTHER | Kootenai | 1904-1909 | |
| LYMAN | Madison | 1887-1889 | |
| 1892-1914 | |||
| LYON | Bonneville | 1900-1909 | |
| LYONDALE | Kootenai | 1906-1910 |
Contributed 2021 Oct 05 by Mark Metkin
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