Bordering states

Idaho vs Wyoming

Short answer

Idaho has 2,001,619 residents, 3.4 times Wyoming's 587,618. Wyoming is the larger by land, 1.17 times the size of Idaho.
ID
2,001,619
WY
587,618

The two states, county by county

Both maps share one density scale, so the same shade means the same number of people per square mile on either side of the border. Darker counties are denser. Select a county to open its page.

Idaho

Madison County: 118.4 per sq miIdaho County: 2.1 per sq miBenewah County: 13.6 per sq miGooding County: 22.2 per sq miLincoln County: 4.6 per sq miMinidoka County: 30.0 per sq miCuster County: 0.9 per sq miBoundary County: 11.1 per sq miLemhi County: 1.8 per sq miTwin Falls County: 50.2 per sq miFranklin County: 23.6 per sq miOneida County: 4.2 per sq miGem County: 39.0 per sq miShoshone County: 5.3 per sq miFremont County: 7.7 per sq miClearwater County: 3.7 per sq miKootenai County: 152.1 per sq miCassia County: 10.1 per sq miBlaine County: 9.6 per sq miClark County: 0.5 per sq miJerome County: 43.6 per sq miBonner County: 31.1 per sq miElmore County: 9.7 per sq miCaribou County: 4.1 per sq miBonneville County: 71.6 per sq miJefferson County: 31.9 per sq miPower County: 6.0 per sq miLewis County: 7.8 per sq miNez Perce County: 50.5 per sq miAda County: 509.2 per sq miAdams County: 3.7 per sq miValley County: 3.5 per sq miBingham County: 24.3 per sq miBannock County: 81.8 per sq miOwyhee County: 1.7 per sq miWashington County: 7.9 per sq miLatah County: 39.2 per sq miTeton County: 28.8 per sq miCamas County: 1.2 per sq miBoise County: 4.5 per sq miBear Lake County: 6.9 per sq miButte County: 1.2 per sq miCanyon County: 454.6 per sq miPayette County: 68.0 per sq mi

Wyoming

Sublette County: 1.8 per sq miNiobrara County: 0.9 per sq miCarbon County: 1.8 per sq miGoshen County: 5.7 per sq miCampbell County: 10.0 per sq miPark County: 4.5 per sq miNatrona County: 15.1 per sq miLaramie County: 37.9 per sq miLincoln County: 5.2 per sq miCrook County: 2.7 per sq miAlbany County: 9.2 per sq miBig Horn County: 3.9 per sq miConverse County: 3.2 per sq miPlatte County: 4.1 per sq miSheridan County: 13.1 per sq miUinta County: 9.9 per sq miSweetwater County: 4.0 per sq miWeston County: 2.9 per sq miTeton County: 5.8 per sq miJohnson County: 2.1 per sq miHot Springs County: 2.3 per sq miFremont County: 4.3 per sq miWashakie County: 3.4 per sq mi
People per sq mi
  1. < 3
  2. < 5
  3. < 10
  4. < 31
  5. ≥ 31
no data

Residents, 2024

  1. 01Idaho2,001,619
  2. 02Wyoming587,618

Land, square miles

  1. 01Idaho82,645
  2. 02Wyoming97,089

People per square mile

  1. 01Idaho24.2
  2. 02Wyoming6.1

Median county household income

  1. 01Idaho$67,254
  2. 02Wyoming$70,330

Side by side

MeasureIdahoWyoming
Residents, 20242,001,619587,618
Rank by population38th51st
Land, sq mi82,64597,089
People per sq mi24.26.1
County-equivalents4423
Median county residents15,01914,250
Median county income$67,254$70,330
Most populous countyAda CountyLaramie County
Largest county by landIdaho CountySweetwater County
CapitalBoiseCheyenne
Daylight at capital, June 2115 h 26 min15 h 09 min
Census divisionMountainMountain
Census Vintage 2024 population, 2024 Gazetteer land area, SAIPE 2023 income. Daylight computed with SunCalc.

Population and density

Idaho has 2,001,619 residents, 3.4 times Wyoming's 587,618. Idaho ranks 38th and Wyoming 51st of the 50 states and DC. Idaho is the more crowded, with 24.2 people per square mile against 6.1, 4.0 times.

Land area

Wyoming has 97,089 square miles of land, 17% more than Idaho's 82,645. The largest county-equivalent in Idaho is Idaho County at 8,478 square miles; in Wyoming it is Sweetwater County at 10,427.

Counties

Idaho is divided into 44 county-equivalents and Wyoming into 23, so an average Idaho county covers 1,878 square miles against 4,221. The typical county in Idaho has 15,019 residents, against 14,250 in Wyoming. The most populous are Ada County (535,799) and Laramie County (101,783).

3 county names appear on both sides of the border: Fremont, Lincoln, Teton. Use the FIPS code, not the name, when joining data across the two states.

Household income

The median county in Wyoming has a household income of $70,330, 5% above Idaho's $67,254. The highest county incomes are Teton County ($94,895) in Idaho and Teton County ($130,156) in Wyoming, from SAIPE 2023.

Capitals and daylight

Boise and Cheyenne are 606 miles apart in a straight line; from Boise the initial bearing is 103°, ESE. On June 21, 2026, Boise gets 15 h 26 min of daylight and Cheyenne 15 h 09 min; on December 21 the figures are 8 h 56 min and 9 h 13 min. Month by month tables are on the Boise and Cheyenne daylight pages.

Where they sit

Both are in the Census Mountain division of the West region. By county internal points, Idaho spans 2 UTM zones and Wyoming 2.

Questions people ask

Which is bigger, Idaho or Wyoming?

Wyoming, with 97,089 square miles of land against 82,645, 1.17 times as large.

Which has more people, Idaho or Wyoming?

Idaho has 2,001,619 residents, 3.4 times Wyoming's 587,618.

How far is Boise from Cheyenne?

606 miles in a straight line, heading ESE (103°) from Boise.

Do Idaho and Wyoming have counties with the same name?

Yes, 3: Fremont, Lincoln, Teton.

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 Bureau regions and divisions of the United States (last verified 2026-09-30)

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