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This Idaho county map shows all 44 counties and their names. Listed below are the county details with population, housing units, and the area of each county in Idaho. Three counties were actually first selected as Washington state counties, but were later changed back to Idaho counties in 1861.
| County | Idaho County Population | Housing Units | Area (sq. mi.) |
|---|---|---|---|
| Ada County | 300904 | 118516 | 1055 |
| Adams County | 3476 | 1982 | 1365 |
| Bannock County | 75565 | 29102 | 1113 |
| Bear Lake County | 6411 | 3268 | 971 |
| Benewah County | 9171 | 4238 | 776 |
| Bingham County | 41735 | 14303 | 2095 |
| Blaine County | 18991 | 12186 | 2645 |
| Boise County | 6670 | 4349 | 1902 |
| Bonner County | 36835 | 19646 | 1738 |
| Bonneville County | 82522 | 30484 | 1868 |
| Boundary County | 9871 | 4095 | 1269 |
| Butte County | 2899 | 1290 | 2233 |
| Camas County | 991 | 601 | 1075 |
| Canyon County | 131441 | 47965 | 590 |
| Caribou County | 7304 | 3188 | 1766 |
| Cassia County | 21416 | 7862 | 2566 |
| Clark County | 1022 | 521 | 1765 |
| Clearwater County | 8930 | 4144 | 2461 |
| Custer County | 4342 | 2983 | 4925 |
| Elmore County | 29130 | 10527 | 3078 |
| Franklin County | 11329 | 3872 | 665 |
| Fremont County | 11819 | 6890 | 1867 |
| Gem County | 15181 | 5888 | 563 |
| Gooding County | 14155 | 5505 | 731 |
| Idaho County | 15511 | 7537 | 8485 |
| Jefferson County | 19155 | 6287 | 1095 |
| Jerome County | 18342 | 6713 | 600 |
| Kootenai County | 108685 | 46607 | 1245 |
| Latah County | 34935 | 13838 | 1077 |
| Lemhi County | 7806 | 4154 | 4564 |
| Lewis County | 3747 | 1795 | 479 |
| Lincoln County | 4044 | 1651 | 1206 |
| Madison County | 27467 | 7630 | 472 |
| Minidoka County | 20174 | 7498 | 760 |
| Nez Perce County | 37410 | 16203 | 849 |
| Oneida County | 4125 | 1755 | 1200 |
| Owyhee County | 10644 | 4452 | 7678 |
| Payette County | 20578 | 7949 | 408 |
| Power County | 7538 | 2844 | 1406 |
| Shoshone County | 13771 | 7057 | 2634 |
| Teton County | 5999 | 2632 | 450 |
| Twin Falls County | 64284 | 25595 | 1925 |
| Valley County | 7651 | 8084 | 3678 |
| Washington County | 9977 | 4138 | 1456 |