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Idaho county map

See all 44 counties on one clear, labelled map. Use the alphabetical table below to verify names and compare land area.

Boundary vintage: 2025Source: U.S. Census BureauUpdated September 15, 2026
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Labelled map of Idaho counties AdaAdamsBannockBear LakeBenewahBinghamBlaineBoiseBonnerBonnevilleBoundaryButteCamasCanyonCaribouCassiaClarkClearwaterCusterElmoreFranklinFremontGemGoodingIdahoJeffersonJeromeKootenaiLatahLemhiLewisLincolnMadisonMinidokaNez PerceOneidaOwyheePayettePowerShoshoneTetonTwin FallsValleyWashington
Boundary data: U.S. Census Bureau 2025 cartographic boundary files. Zoom in for county names, then drag the map or use the arrow keys to move around.
Map scope: This is a county boundary reference map. It does not show roads, parcels, ZIP codes, election precincts, or terrain.

Alphabetical list of Idaho counties

The land-area figures are rounded to the nearest square mile. Water area is shown separately so large lakes or coastal waters do not obscure the comparison.

NameFIPS codeLand areaWater area
Ada County160011,052 sq mi9 sq mi
Adams County160031,363 sq mi7 sq mi
Bannock County160051,112 sq mi36 sq mi
Bear Lake County16007976 sq mi74 sq mi
Benewah County16009777 sq mi7 sq mi
Bingham County160112,094 sq mi26 sq mi
Blaine County160132,638 sq mi17 sq mi
Boise County160151,899 sq mi7 sq mi
Bonner County160171,733 sq mi185 sq mi
Bonneville County160191,866 sq mi34 sq mi
Boundary County160211,269 sq mi9 sq mi
Butte County160232,236 sq mi2 sq mi
Camas County160251,074 sq mi4 sq mi
Canyon County16027587 sq mi17 sq mi
Caribou County160291,764 sq mi34 sq mi
Cassia County160312,566 sq mi15 sq mi
Clark County160331,763 sq mi1 sq mi
Clearwater County160352,457 sq mi31 sq mi
Custer County160374,922 sq mi16 sq mi
Elmore County160393,075 sq mi26 sq mi
Franklin County16041663 sq mi5 sq mi
Fremont County160431,864 sq mi32 sq mi
Gem County16045560 sq mi5 sq mi
Gooding County16047729 sq mi5 sq mi
Idaho County160498,477 sq mi26 sq mi
Jefferson County160511,094 sq mi12 sq mi
Jerome County16053598 sq mi5 sq mi
Kootenai County160551,238 sq mi71 sq mi
Latah County160571,076 sq mi1 sq mi
Lemhi County160594,564 sq mi5 sq mi
Lewis County16061479 sq mi1 sq mi
Lincoln County160631,201 sq mi4 sq mi
Madison County16065469 sq mi4 sq mi
Minidoka County16067757 sq mi5 sq mi
Nez Perce County16069848 sq mi8 sq mi
Oneida County160711,199 sq mi2 sq mi
Owyhee County160737,668 sq mi29 sq mi
Payette County16075407 sq mi3 sq mi
Power County160771,404 sq mi38 sq mi
Shoshone County160792,637 sq mi5 sq mi
Teton County16081449 sq mi1 sq mi
Twin Falls County160831,922 sq mi7 sq mi
Valley County160853,665 sq mi68 sq mi
Washington County160871,453 sq mi21 sq mi

Largest Idaho counties by land area

These are the five largest mapped units in Idaho by Census-reported land area:

  1. Idaho County — 8,477 square miles
  2. Owyhee County — 7,668 square miles
  3. Custer County — 4,922 square miles
  4. Lemhi County — 4,564 square miles
  5. Valley County — 3,665 square miles

How to read and use this map

County lines are administrative boundaries, not postal routes. A mailing address can use a city name associated with a neighboring area, and ZIP codes can cross county lines. When you need to identify a county for an address, confirm it with an official geocoder or local government source.

For classroom or planning use, print directly from this page. If labels become crowded, choose landscape orientation and reduce page margins. The underlying vector lines remain crisp at different sizes.

Frequently asked questions

How many counties are in Idaho?

Idaho has 44 counties in the U.S. Census Bureau’s 2025 cartographic boundary file.

Can I print this Idaho county map?

Yes. Choose Print map and use landscape orientation for the widest map. Because the map is SVG, its boundary lines stay sharp when scaled.

Are these legal survey boundaries?

No. This is a generalized reference map. Property, parcel, election, and legal boundary questions should be checked with the relevant state or local agency.

Map source

U.S. Census Bureau, 2025 Cartographic Boundary File, Counties, 1:20,000,000. Land and water area fields are supplied in the same file and converted from square meters to square miles. Accessed September 15, 2026.