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Understand Idaho

Idaho population density

24.6 per sq mi

Residents per square mile of land in Idaho, 2025 (estimate)

Source: U.S. Census Bureau, Population density (computed by Understand Idaho). Data period 2025. Status: estimate. Published .

July 1 resident population estimate divided by land area in square miles from the Census Bureau's Gazetteer file of the same year.

Change and comparison

Among 50 states and the District of Columbia, Idaho ranked 45th highest in 2025. District of Columbia was highest at 11,347.6 per sq mi and Alaska lowest at 1.3 per sq mi.

Among Idaho and its 6 neighboring states, Idaho ranks 5th highest; Nevada is next above at 29.9 per sq mi and Montana next below at 7.9 per sq mi.

Among 44 Idaho counties in 2025, Ada County was highest at 519 per sq mi and Clark County lowest at 0.4 per sq mi.

By county

  1. Ada519
  2. Canyon468.7
  3. Kootenai155
  4. Madison117.6
  5. Bannock82.3
  6. Bonneville72.8
  7. Payette68.4
  8. Twin Falls50.8
  9. Nez Perce50.6
  10. Jerome44.1
  11. Gem38.9
  12. Latah38.9
  13. Jefferson32.3
  14. Bonner31.4
  15. Minidoka30.3
  16. Teton29.5
  17. Bingham24.4
  18. Franklin24
  19. Gooding22.5
  20. Benewah13.5
  21. Boundary11
  22. Cassia10.3
  23. Blaine9.7
  24. Elmore9.6
  25. Washington8
  26. Lewis7.7
  27. Fremont7.6
  28. Bear Lake6.9
  29. Power5.9
  30. Shoshone5.4
  31. Lincoln4.7
  32. Boise4.5
  33. Oneida4.2
  34. Caribou4.1
  35. Adams3.7
  36. Clearwater3.7
  37. Valley3.5
  38. Idaho2.1
  39. Lemhi1.9
  40. Owyhee1.7
  41. Butte1.2
  42. Camas1.2
  43. Custer0.9
  44. Clark0.4

Source: U.S. Census Bureau, Population density (computed by Understand Idaho). Data period 2025. Published .

Ada County: 519 People per square mile (2025)Adams County: 3.7 People per square mile (2025)Bannock County: 82.3 People per square mile (2025)Bear Lake County: 6.9 People per square mile (2025)Benewah County: 13.5 People per square mile (2025)Bingham County: 24.4 People per square mile (2025)Blaine County: 9.7 People per square mile (2025)Boise County: 4.5 People per square mile (2025)Bonner County: 31.4 People per square mile (2025)Bonneville County: 72.8 People per square mile (2025)Boundary County: 11 People per square mile (2025)Butte County: 1.2 People per square mile (2025)Camas County: 1.2 People per square mile (2025)Canyon County: 468.7 People per square mile (2025)Caribou County: 4.1 People per square mile (2025)Cassia County: 10.3 People per square mile (2025)Clark County: 0.4 People per square mile (2025)Clearwater County: 3.7 People per square mile (2025)Custer County: 0.9 People per square mile (2025)Elmore County: 9.6 People per square mile (2025)Franklin County: 24 People per square mile (2025)Fremont County: 7.6 People per square mile (2025)Gem County: 38.9 People per square mile (2025)Gooding County: 22.5 People per square mile (2025)Idaho County: 2.1 People per square mile (2025)Jefferson County: 32.3 People per square mile (2025)Jerome County: 44.1 People per square mile (2025)Kootenai County: 155 People per square mile (2025)Latah County: 38.9 People per square mile (2025)Lemhi County: 1.9 People per square mile (2025)Lewis County: 7.7 People per square mile (2025)Lincoln County: 4.7 People per square mile (2025)Madison County: 117.6 People per square mile (2025)Minidoka County: 30.3 People per square mile (2025)Nez Perce County: 50.6 People per square mile (2025)Oneida County: 4.2 People per square mile (2025)Owyhee County: 1.7 People per square mile (2025)Payette County: 68.4 People per square mile (2025)Power County: 5.9 People per square mile (2025)Shoshone County: 5.4 People per square mile (2025)Teton County: 29.5 People per square mile (2025)Twin Falls County: 50.8 People per square mile (2025)Valley County: 3.5 People per square mile (2025)Washington County: 8 People per square mile (2025)
  • 0.4 to 3.6
  • 3.7 to 7.5
  • 7.6 to 23.6
  • 23.7 to 46.6
  • 46.7 to 519

Source: U.S. Census Bureau, Population density (computed by Understand Idaho). Data period 2025. Published .

Data table (44 rows)
County2025
Ada County519
Canyon County468.7
Kootenai County155
Madison County117.6
Bannock County82.3
Bonneville County72.8
Payette County68.4
Twin Falls County50.8
Nez Perce County50.6
Jerome County44.1
Gem County38.9
Latah County38.9
Jefferson County32.3
Bonner County31.4
Minidoka County30.3
Teton County29.5
Bingham County24.4
Franklin County24
Gooding County22.5
Benewah County13.5
Boundary County11
Cassia County10.3
Blaine County9.7
Elmore County9.6
Washington County8
Lewis County7.7
Fremont County7.6
Bear Lake County6.9
Power County5.9
Shoshone County5.4
Lincoln County4.7
Boise County4.5
Oneida County4.2
Caribou County4.1
Adams County3.7
Clearwater County3.7
Valley County3.5
Idaho County2.1
Lemhi County1.9
Owyhee County1.7
Butte County1.2
Camas County1.2
Custer County0.9
Clark County0.4

Compared with other states

  1. District of Columbia11,347.6
  2. New Jersey1,298.2
  3. Rhode Island1,078
  4. Washington120.4
  5. Oregon44.5
  6. Utah42.8
  7. Nevada29.9
  8. Idaho24.6
  9. Montana7.9
  10. Wyoming6.1
  11. Alaska1.3

Source: U.S. Census Bureau, Population density (computed by Understand Idaho). Data period 2025. Published .

An excerpt; the full table is below.

State2025
1. District of Columbia11,347.6
2. New Jersey1,298.2
3. Rhode Island1,078
4. Massachusetts917.1
5. Connecticut761.7
6. Maryland645.2
7. Delaware544
8. Florida437.3
9. New York424.5
10. Pennsylvania291.9
Data table (51 rows)
State2025
1. District of Columbia11,347.6
2. New Jersey1,298.2
3. Rhode Island1,078
4. Massachusetts917.1
5. Connecticut761.7
6. Maryland645.2
7. Delaware544
8. Florida437.3
9. New York424.5
10. Pennsylvania291.9
11. Ohio291.3
12. California252.5
13. North Carolina230.3
14. Illinois229.1
15. Virginia224.9
16. Hawaii223.1
17. Georgia195.8
18. Indiana194.6
19. South Carolina185.3
20. Michigan178.9
21. Tennessee177.4
22. New Hampshire158.1
23. Texas121.4
24. Washington120.4
25. Kentucky116.7
26. Wisconsin110.3
27. Louisiana106.9
28. Alabama102.5
29. Missouri91.2
30. West Virginia73.5
31. Minnesota73.2
32. Vermont69.9
33. Arizona67.1
34. Mississippi63
35. Oklahoma60.1
36. Arkansas59.9
37. Colorado58
38. Iowa58
39. Maine45.9
40. Oregon44.5
41. Utah42.8
42. Kansas36.4
43. Nevada29.9
44. Nebraska26.3
45. Idaho24.6
46. New Mexico17.5
47. South Dakota12.3
48. North Dakota11.6
49. Montana7.9
50. Wyoming6.1
51. Alaska1.3

Source

Organization
U.S. Census Bureau
Dataset
Population density (computed by Understand Idaho)
Geography
Nation, all 50 states and DC, Idaho's 44 counties, and the ten largest Idaho incorporated places
Time coverage
2010-2025
Update frequency
Annual
Published
Original file
https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/counties/totals/co-est2025-alldata.csv
License
Public domain. U.S. federal government work.
Our copy
Population density (computed by Understand Idaho), built by lib/derived.ts

Caveats

  • Computed by Understand Idaho from Population Estimates Program and Gazetteer Files, 2025 (counties and states); it is not a figure the publisher releases.
  • Totals for 2010-2019 are Vintage 2019 estimates and 2020-2025 are Vintage 2025; the two series are not reconciled, so a change at the seam includes the vintage revision.
  • City (incorporated place) totals cover 2020-2025 only; no 2010-2019 city series is included.
  • Components of change are published for the nation, states and Idaho's 44 counties; other states' county components are not included.
  • The ten places are Boise City, Meridian, Nampa, Caldwell, Idaho Falls, Pocatello, Coeur d'Alene, Twin Falls, Post Falls and Rexburg, the ten largest by 2025 population estimate.
  • Group quarters estimates, the residual component, population-based rates, and Puerto Rico are not included.
  • The national domestic migration cell is 0 by construction (moves between states net to nothing) and is not stored as an observation; the United States has international migration and natural change only.
  • Area follows the legal boundary vintage in effect January 1, 2025, and can change from one vintage to the next when a boundary is corrected, even where nothing changed on the ground.
  • ALAND_SQMI and AWATER_SQMI are derived by the Census Bureau from ALAND and AWATER, which it measures in square meters; this dataset stores the square-mile figure as the Bureau prints it, to three decimals.
  • The 2025 state/national file carries no United States total row, so no nation-level observation is stored; Puerto Rico is excluded because it is not in data/geographies.json.

Inputs: Population Estimates Program and Gazetteer Files, 2025 (counties and states).

Cite

Cite this page as Understand Idaho, “Idaho population density”, https://understandidaho.com/population/density/, retrieved on the date you read it, and the publisher named above for the figures themselves. The dataset behind it is described in the data catalog.

This page was last updated .