State 16 · ID

Idaho county map

Idaho has 44 counties. Idaho County is the largest by land at 8,478 square miles, and Ada County is the most populous with 535,799 residents.

Population 2024
2,001,619
#38 of 51
Land area
82,645 sq mi
#11 of 51
Density
24.2 / sq mi
#45 of 51
Counties
44
Capital: Boise
N
Boise 43.62° N, 116.22° W

Map of all 44 counties in Idaho

Every county is labeled on Census 2024 boundaries. Download it as a PDF to print, a PNG, or an editable SVG. For blank, colored or city versions, see the printable Idaho map sheets.

AdaAdamsBannockBear LakeBenewahBinghamBlaineBoiseBonnerBonnevilleBoundaryButteCamasCanyonCaribouCassiaClarkClearwaterCusterElmoreFranklinFremontGemGoodingIdahoJeffersonJeromeKootenaiLatahLemhiLewisLincolnMadisonMinidokaNez PerceOneidaOwyheePayettePowerShoshoneTetonTwin FallsValleyWashingtonIdaho county map. Online Map Tools (onlinemaptools.com), Census 2024 boundaries, free to reuse with credit.
44 units labeled. The orange dot marks the capital.

Idaho population and land area

Idaho had 2,001,619 residents in the Census Vintage 2024 estimates, the sum of its counties. That ranks 38th of the 50 states and DC. Its 82,645 square miles of land rank 11th. Idaho averages 24.2 people per square mile of land, about 4.0 times sparser than the national figure of 96.3. By density it ranks 45th.

Population, 2024
2,001,61938th of 51
Land area
82,645 sq mi11th of 51
Density
24.2 per sq mi45th of 51
Number of counties
44
Capital
Boise43.618° N, 116.215° W
State FIPS code
16

Idaho counties by population, density and income

Each shape is shaded by quintile, darker for higher values. Switch the measure above the map. Select a shape to open that county's page. The pin marks the capital, Boise.

Madison County: 118Idaho County: 2.1Benewah County: 14Gooding County: 22Lincoln County: 4.6Minidoka County: 30Custer County: 0.9Boundary County: 11Lemhi County: 1.8Twin Falls County: 50Franklin County: 24Oneida County: 4.2Gem County: 39Shoshone County: 5.3Fremont County: 7.7Clearwater County: 3.7Kootenai County: 152Cassia County: 10Blaine County: 9.6Clark County: 0.5Jerome County: 44Bonner County: 31Elmore County: 9.7Caribou County: 4.1Bonneville County: 72Jefferson County: 32Power County: 6.0Lewis County: 7.8Nez Perce County: 51Ada County: 509Adams County: 3.7Valley County: 3.5Bingham County: 24Bannock County: 82Owyhee County: 1.7Washington County: 7.9Latah County: 39Teton County: 29Camas County: 1.2Boise County: 4.5Bear Lake County: 6.9Butte County: 1.2Canyon County: 455Payette County: 68
Density
  1. < 3.7
  2. 3.7+
  3. 7.7+
  4. 22+
  5. 44+
no data

Largest county in Idaho by land area

Idaho County ranks first at 8,478 square miles and Payette County last at 407 square miles. The top value is 21 times the bottom one.

  1. 01Idaho County8,478
  2. 02Owyhee County7,668
  3. 03Custer County4,922
  4. 04Lemhi County4,564
  5. 05Valley County3,665
  6. 06Elmore County3,075
  7. 07Blaine County2,638
  8. 08Shoshone County2,637
  9. 09Cassia County2,566
  10. 10Clearwater County2,457

Most populous county in Idaho

Ada County ranks first at 535,799 residents and Clark County last at 794 residents. The gap is more than a hundredfold.

  1. 01Ada County535,799
  2. 02Canyon County266,892
  3. 03Kootenai County188,323
  4. 04Bonneville County133,644
  5. 05Twin Falls County96,509
  6. 06Bannock County91,010
  7. 07Madison County55,549
  8. 08Bonner County53,955
  9. 09Bingham County50,889
  10. 10Nez Perce County42,847

Least populous county in Idaho

The smallest populations, fewest first. Estimates for small counties carry more uncertainty than those for large ones.

  1. 01Clark County794
  2. 02Camas County1,247
  3. 03Butte County2,735
  4. 04Lewis County3,728
  5. 05Custer County4,597
Log scale, so small counties stay visible next to the largest.

Most densely populated county in Idaho

Ada County ranks first at 509.2 people per square mile and Clark County last at 0.5 people per square mile. The gap is more than a hundredfold.

  1. 01Ada County509.2
  2. 02Canyon County454.6
  3. 03Kootenai County152.1
  4. 04Madison County118.4
  5. 05Bannock County81.8
  6. 06Bonneville County71.6
  7. 07Payette County68.0
  8. 08Nez Perce County50.5
  9. 09Twin Falls County50.2
  10. 10Jerome County43.6
People per square mile of land, log scale.

Highest median household income in Idaho

Teton County ranks first at $94,895 and Lewis County last at $53,212. The two are within a factor of 1.78.

  1. 01Teton County$94,895
  2. 02Blaine County$94,471
  3. 03Ada County$90,513
  4. 04Valley County$84,024
  5. 05Jefferson County$81,566
  6. 06Franklin County$80,768
  7. 07Kootenai County$75,235
  8. 08Bonneville County$74,948
  9. 09Boise County$74,433
  10. 10Bingham County$73,409

Towns and cities in Idaho

The Census Vintage 2024 subcounty estimates list 86 incorporated places in Idaho with 1,000 or more residents, holding 1,381,809 people together, or 69% of the state total. 36 of them have 5,000 or more. The northernmost is Moyie Springs at 48.725° N and the southernmost is Franklin at 42.010° N. Among places of 5,000+, Star grew fastest from July 2020 to July 2024, by 58.8%.

  1. 01Boise City237,963
  2. 02Meridian139,740
  3. 03Nampa117,350
  4. 04Caldwell73,088
  5. 05Idaho Falls69,523
  6. 06Pocatello58,231
  7. 07Coeur d'Alene57,355
  8. 08Twin Falls55,589
  9. 09Post Falls45,800
  10. 10Rexburg40,695
  11. 11Lewiston34,693
  12. 12Eagle33,451
Largest incorporated places, Vintage 2024 estimates.

Boise, the capital

55.2% of Idaho's place population, 762,388 of 1,381,809 people, lives in places within 100 miles of Boise. That ranks 35th of 51 for how central the capital is. The most remote town of 1,000 to 9,999 people is Salmon, 78 miles in a straight line from the nearest place of 10,000+ (Butte-Silver Bow).

See all states in the capital radius ranking and the most remote towns ranking. Sunrise and sunset times for Boise, month by month, are on the Boise daylight page.

States bordering Idaho

Idaho borders 6 states or districts. The nearest neighboring capital is Helena, 290 miles NE of Boise in a straight line.

UTM zones in Idaho

The internal points of Idaho's counties fall in UTM zones 11, 12. Zones are 6 degrees of longitude wide, numbered from 180° W: zone = floor((longitude + 180) / 6) + 1. Because Idaho spans 2 zones, no single UTM zone covers the whole state.

All 44 counties in Idaho

Sort by any column. The small orange number marks the top 3 in the state by population.

FIPS
16001Ada County535,799#11,052509.2$90,513
16027Canyon County266,892#2587454.6$72,059
16055Kootenai County188,323#31,238152.1$75,235
16019Bonneville County133,6441,86671.6$74,948
16083Twin Falls County96,5091,92250.2$66,664
16005Bannock County91,0101,11281.8$67,371
16065Madison County55,549469118.4$58,236
16017Bonner County53,9551,73331.1$68,030
16011Bingham County50,8892,09424.3$73,409
16069Nez Perce County42,84784850.5$70,340
16057Latah County42,1801,07639.2$63,916
16051Jefferson County34,8541,09431.9$81,566
16039Elmore County29,7293,0759.7$64,247
16075Payette County27,66240768.0$67,532
16053Jerome County26,05659843.6$62,543
16031Cassia County25,9762,56610.1$68,267
16013Blaine County25,2612,6389.6$94,471
16067Minidoka County22,69175730.0$68,029
16045Gem County21,85756039.0$62,479
16049Idaho County17,9128,4782.1$57,210
16047Gooding County16,18972922.2$65,662
16041Franklin County15,63866323.6$80,768
16043Fremont County14,3991,8647.7$72,061
16079Shoshone County14,0742,6375.3$59,937
16021Boundary County14,0401,26911.1$65,044
16081Teton County12,93244928.8$94,895
16085Valley County12,7773,6653.5$84,024
16073Owyhee County12,7487,6681.7$60,701
16087Washington County11,5391,4537.9$57,369
16009Benewah County10,52977713.6$60,872
16035Clearwater County9,1512,4573.7$58,757
16015Boise County8,5811,8994.5$74,433
16059Lemhi County8,3974,5641.8$57,562
16077Power County8,3811,4046.0$68,403
16029Caribou County7,2391,7644.1$70,183
16007Bear Lake County6,7799766.9$67,519
16063Lincoln County5,5561,2014.6$65,511
16003Adams County4,9981,3633.7$59,829
16071Oneida County4,9761,1994.2$67,137
16037Custer County4,5974,9220.9$58,294
16061Lewis County3,7284797.8$53,212
16023Butte County2,7352,2361.2$57,678
16025Camas County1,2471,0741.2$72,175
16033Clark County7941,7630.5$55,625

Download all 44 counties as CSV

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 Gazetteer, places
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.