Idaho County Map With Cities
By Marko Visic · Updated Oct 5, 2026
Idaho has 44 counties, covering 82,645 square miles of land. The Census Bureau estimates its population at 2,029,733 as of July 1, 2025. The largest county by land area is Idaho County; the most populous is Ada County; the least populous is Clark County.
Tap or click any county for details. Need a printable version? Blank Idaho map (PDF/PNG/SVG).
All 44 Idaho counties
| County | FIPS code | Population (July 1, 2025) ▼ | Change since April 2020 | Land area (sq mi) | People per sq mi | Median household income (2020–2024) |
|---|---|---|---|---|---|---|
| Ada County | 16001 | 546,141 | +10.3% | 1,052 | 519 | $91,502 |
| Canyon County | 16027 | 275,123 | +19.0% | 587 | 469 | $76,488 |
| Kootenai County | 16055 | 191,864 | +12.0% | 1,238 | 155 | $81,861 |
| Bonneville County | 16019 | 135,771 | +9.5% | 1,866 | 73 | $79,068 |
| Twin Falls County | 16083 | 97,539 | +8.3% | 1,922 | 51 | $67,409 |
| Bannock County | 16005 | 91,591 | +5.2% | 1,112 | 82 | $66,499 |
| Madison County | 16065 | 55,172 | +4.3% | 469 | 118 | $60,160 |
| Bonner County | 16017 | 54,420 | +15.5% | 1,733 | 31 | $66,979 |
| Bingham County | 16011 | 51,153 | +6.6% | 2,094 | 24 | $77,878 |
| Nez Perce County | 16069 | 42,905 | +1.9% | 848 | 51 | $72,599 |
| Latah County | 16057 | 41,842 | +5.9% | 1,080 | 39 | $65,424 |
| Jefferson County | 16051 | 35,297 | +14.3% | 1,094 | 32 | $86,679 |
| Elmore County | 16039 | 29,465 | +2.8% | 3,075 | 10 | $65,359 |
| Payette County | 16075 | 27,824 | +9.6% | 407 | 68 | $67,673 |
| Cassia County | 16031 | 26,397 | +6.9% | 2,566 | 10 | $70,830 |
| Jerome County | 16053 | 26,362 | +8.7% | 598 | 44 | $71,724 |
| Blaine County | 16013 | 25,517 | +5.1% | 2,638 | 10 | $92,566 |
| Minidoka County | 16067 | 22,911 | +6.1% | 757 | 30 | $70,377 |
| Gem County | 16045 | 21,773 | +13.8% | 560 | 39 | $64,605 |
| Idaho County | 16049 | 17,874 | +8.0% | 8,477 | 2 | $66,325 |
| Gooding County | 16047 | 16,446 | +5.4% | 729 | 23 | $63,559 |
| Franklin County | 16041 | 15,889 | +11.9% | 663 | 24 | $71,950 |
| Fremont County | 16043 | 14,208 | +6.1% | 1,864 | 8 | $72,683 |
| Shoshone County | 16079 | 14,130 | +7.3% | 2,638 | 5 | $55,527 |
| Boundary County | 16021 | 13,997 | +16.1% | 1,269 | 11 | $67,237 |
| Teton County | 16081 | 13,254 | +13.9% | 449 | 30 | $99,805 |
| Valley County | 16085 | 12,831 | +9.3% | 3,665 | 4 | $76,078 |
| Owyhee County | 16073 | 12,661 | +6.3% | 7,668 | 2 | $64,406 |
| Washington County | 16087 | 11,583 | +10.4% | 1,453 | 8 | $54,000 |
| Benewah County | 16009 | 10,508 | +10.2% | 777 | 14 | $59,794 |
| Clearwater County | 16035 | 9,118 | +4.4% | 2,453 | 4 | $60,000 |
| Boise County | 16015 | 8,545 | +12.3% | 1,899 | 4 | $78,774 |
| Lemhi County | 16059 | 8,474 | +6.3% | 4,564 | 2 | $53,202 |
| Power County | 16077 | 8,246 | +4.7% | 1,404 | 6 | $61,146 |
| Caribou County | 16029 | 7,252 | +3.2% | 1,764 | 4 | $68,782 |
| Bear Lake County | 16007 | 6,727 | +5.7% | 976 | 7 | $75,260 |
| Lincoln County | 16063 | 5,603 | +9.2% | 1,201 | 5 | $71,453 |
| Oneida County | 16071 | 5,085 | +11.4% | 1,199 | 4 | $74,954 |
| Adams County | 16003 | 5,013 | +14.5% | 1,363 | 4 | $61,808 |
| Custer County | 16037 | 4,636 | +8.4% | 4,922 | 1 | $67,574 |
| Lewis County | 16061 | 3,704 | +4.8% | 479 | 8 | $51,615 |
| Butte County | 16023 | 2,783 | +8.2% | 2,236 | 1 | $53,015 |
| Camas County | 16025 | 1,316 | +22.8% | 1,074 | 1 | $57,955 |
| Clark County | 16033 | 783 | -0.6% | 1,763 | 0 | $55,208 |
FIPS code: the Census Bureau’s five-digit county ID, a two-digit state code plus a three-digit county code. It is not a ZIP code.
How many counties does Idaho have?
Idaho has 44 counties covering 82,645 square miles. The state was admitted to the Union in 1890 as the 43rd state.
The largest county by land area is Idaho County at 8,477 square miles, home to 17,874 residents. The most populous is Ada County with 546,141 residents — a density of 519 people per square mile. At the other end of the scale, Clark County has 783 residents.
Boise is both the state capital and the largest city in Idaho.
Related resources
Download a printable outline of Idaho’s county boundaries from our blank map of Idaho page — available in SVG, PNG, and PDF.
Use the What County Am I In? tool to detect which Idaho county a GPS location or address falls in, or the Address to County Lookup for batch input.
For demographic radius analysis, the Find ZIP Codes in Radius and Population Within Radius tools let you draw a circle around any Idaho address and see every ZIP code and the total population inside.
Two SimpleMapLab studies cover Idaho specifically: the 100-mile radius around Boise measures how much of the state lives within 100 miles of its capitol, and the loneliest town in Idaho ranks the state’s most isolated inhabited place. The county-counts blog post puts Idaho’s 44 counties in national context.
Frequently asked questions
- County Population Totals, Vintage 2025: estimates for July 1, 2025, released March 2026
- Gazetteer Files, 2026: county land and water area
- American Community Survey 5-Year Estimates, 2020–2024: median household income (table B19013)
- County boundaries on the map: US Atlas TopoJSON build of the US Census Bureau’s TIGER/Line shapefiles. All figures are US Census Bureau data in the public domain.