PO | County | Dates | Comments |
| GALENA | Blaine | 1880-1888 | |
| GALENA | Kootenai | 1912-1913 | |
| GANNETT | Blaine | 1911-1966 | |
| GARDEN VALLEY | Boise | 1875-1876 | |
| 1879-1888 | |||
| 1888-Date | |||
| GARDENA | Boise | 1915-1976 | |
| GARNER | Franklin | 1891-1892 | |
| GARNET | Elmore | 1896-1910 | renamed COMET |
| GARWOOD | Kootenai | 1907-1933 | |
| GEM | Shoshone | 1888-1965 | |
| GENESEE | Latah | 1878-Date | |
| GENEVA | Bear Lake | 1898-Date | |
| GENTILE VALLEY | Franklin | 1874-1900 | renamed THATCHER |
| GEORGETOWN | Bear Lake | 1877-Date | |
| GERICH | Bonner | 1910-1911 | renamed RIVERSIDE |
| GIBBONSVILLE | Lemhi | 1878-1999 | |
| GIBBS | Kootenai | 1910-1915 | was LACROSSE |
| 1918-1954 | |||
| GIFFORD | Nez Perce | 1901-1964 | |
| GILBERT | Clearwater | 1894-1898 | |
| 1903-1922 | |||
| GILMAN | Blaine | 1882-1887 | |
| GILMORE | Lemhi | 1902-1957 | |
| GIMLET | Blaine | 1881-1883 | |
| 1895-1899 | |||
| GIVENS SPRINGS | Owyhee | 1917-1934 | was ENTERPRISE |
| GLADYS | Custer | 1903-1904 | |
| GLEN | Bonneville | 1905-1916 | |
| GLEN DAVIES | Elmore | 1895-1895 | renamed DAVIES |
| GLENCOE | Camas | 1880-1880 | |
| 1881-1881 | |||
| GLENDALE | Franklin | 1895-1904 | |
| GLENGARY | Bonner | 1906-1944 | |
| GLENGROVE | Blaine | 1881-1882 | |
| GLENN | Clearwater | 1885-1891 | |
| 1896-1900 | renamed BLAKE | ||
| GLENNS FERRY | Elmore | 1879-Date | |
| GLENWOOD | Idaho | 1880-1893 | renamed BROWNSVILLE |
| 1904-1934 | was GLOVER | ||
| GLOVER | Idaho | 1901-1904 | renamed GLENWOOD |
| GOFF | Idaho | 1894-1913 | |
| GOLDBURG | Custer | 1890-1942 | |
| GOLDEN | Idaho | 1910-1966 | |
| GOODING | Gooding | 1900-Date | was TOPONIS |
| GOODRICH | Adams | 1901-1906 | |
| 1912-1957 | was MILLIGAN | ||
| GOOSE CREEK | Cassia | 1878-1888 | renamed THATCHER |
| GORDON | Shoshone | 1894-1906 | renamed REMINGTON |
| GOSHEN | Bingham | 1896-1905 | |
| GRACE | Caribou | 1894-Date | |
| GRAHAM | Boise | 1888-1892 | |
| GRAND VIEW | Owyhee | 1888-Date | |
| GRANGEMONT | Clearwater | 1917-1955 | |
| GRANGEVILLE | Idaho | 1876-Date | |
| GRANITE | Bonner | 1883-1884 | |
| 1888-1896 | |||
| 1897-1898 | |||
| 1900-1954 | |||
| GRANT | Jefferson | 1893-1906 | |
| GRASMERE | Owyhee | 1910-1919 | |
| 1945-1973 | |||
| GRASSY HILL | Owyhee | 1915-1918 | |
| GRAY | Bonneville | 1892-1960 | was GRAY'S |
| GRAY'S | Bonneville | 1888-1892 | renamed GRAY |
| GREEN TIMBER | Fremont | 1906-1912 | |
| GREENCREEK | Idaho | 1897-1975 | |
| GREENDALE | Elmore | 1915-1915 | |
| GREENLEAF | Canyon | 1908-Date | |
| GREER | Clearwater | 1899-1957 | |
| GREGG | Idaho | 1898-1903 | |
| GREYHOUND | Custer | 1908-1910 | |
| GRIMES PASS | Boise | 1913-1942 | was GRIMPASS |
| GRIMPASS | Boise | 1912-1913 | renamed GRIMES PASS |
| GROSS | Gem | 1906-1919 | |
| 1919-1932 | |||
| GROUSE | Custer | 1899-1976 | |
| GUFFEY | Owyhee | 1897-1899 | renamed MURPHY |
| 1910-1919 | |||
| GUILD | Fremont | 1925-1934 | renamed BIG SPRINGS |
| GUNNELL | Cassia | 1911-1912 | |
| GUYAZ | Bonneville | 1920-1937 | |
| GWENFORD | Oneida | 1899-1923 | |
| 1923-1937 |
Contributed 2021 Oct 05 by Mark Metkin
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