How many counties in Idaho? All 44 listed
Quick answer
Idaho has 44 counties and county equivalents holding 1,893,296 residents. The most populous county in Idaho is Ada County with 508,052 residents; the smallest is Clark County. County boundaries divide the state's land area — measured in square miles by the Census Bureau — into the units used for property assessment, elections and local sales tax. The statewide sales tax base rate is 6%, before county and city add-ons.
All 44 counties
Ranked by population, Census 2019-2023 ACS 5-year estimates.
| County | Population | Median income | Median home value | Median rent |
|---|---|---|---|---|
| Ada County | 508,052 | $88,907 | $476,000 | $1,465 |
| Canyon County | 242,405 | $72,355 | $350,300 | $1,259 |
| Kootenai County | 177,736 | $77,034 | $467,400 | $1,330 |
| Bonneville County | 127,056 | $76,646 | $327,000 | $1,054 |
| Twin Falls County | 92,121 | $65,338 | $292,700 | $1,011 |
| Bannock County | 88,457 | $64,080 | $267,200 | $879 |
| Madison County | 53,578 | $58,259 | $365,000 | $965 |
| Bonner County | 49,456 | $65,168 | $433,400 | $1,059 |
| Bingham County | 48,993 | $76,842 | $258,000 | $845 |
| Nez Perce County | 42,477 | $71,466 | $291,300 | $936 |
| Latah County | 40,315 | $65,179 | $342,500 | $905 |
| Jefferson County | 32,234 | $82,952 | $335,000 | $1,098 |
| Elmore County | 29,046 | $58,976 | $278,300 | $1,111 |
| Payette County | 26,190 | $65,723 | $310,700 | $874 |
| Cassia County | 25,165 | $67,042 | $257,300 | $920 |
| Jerome County | 24,788 | $69,338 | $254,000 | $862 |
| Blaine County | 24,579 | $84,470 | $663,800 | $1,217 |
| Minidoka County | 21,922 | $70,060 | $235,300 | $909 |
| Gem County | 19,854 | $66,245 | $367,300 | $887 |
| Idaho County | 17,120 | $60,975 | $284,600 | $797 |
| Gooding County | 15,740 | $62,395 | $231,800 | $859 |
| Franklin County | 14,715 | $65,991 | $304,000 | $831 |
| Fremont County | 13,701 | $72,767 | $281,800 | $803 |
| Shoshone County | 13,580 | $49,975 | $222,700 | $880 |
| Boundary County | 12,695 | $62,438 | $344,100 | $867 |
| Owyhee County | 12,284 | $59,773 | $281,600 | $771 |
| Valley County | 12,136 | $76,125 | $599,500 | $1,011 |
| Teton County | 12,101 | $90,740 | $595,900 | $1,196 |
| Washington County | 10,866 | $53,608 | $250,300 | $919 |
| Benewah County | 9,913 | $56,553 | $255,800 | $853 |
| Clearwater County | 8,921 | $57,961 | $240,800 | $847 |
| Lemhi County | 8,166 | $52,057 | $282,100 | $721 |
| Boise County | 8,045 | $77,349 | $424,100 | $854 |
| Power County | 8,018 | $59,760 | $191,200 | $729 |
| Caribou County | 7,118 | $66,653 | $220,200 | $800 |
| Bear Lake County | 6,552 | $67,304 | $234,200 | $687 |
| Lincoln County | 5,276 | $66,038 | $206,700 | $860 |
| Oneida County | 4,681 | $72,563 | $228,100 | $1,009 |
| Adams County | 4,599 | $59,286 | $327,300 | $823 |
| Custer County | 4,411 | $56,957 | $295,600 | $744 |
| Lewis County | 3,649 | $49,643 | $202,400 | $708 |
| Butte County | 2,654 | $43,281 | $195,800 | $525 |
| Camas County | 1,155 | $55,536 | $248,900 | $992 |
| Clark County | 776 | $52,083 | $203,000 | $771 |
Source: US Census Bureau, ACS 2019-2023 5-year estimates · rates as published for 2019-2023 ACS 5-year
Keep going
More Idaho data.