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Ada County, Idaho

1A

Indicators

Population and growth

MeasureAda CountyIdahoData periodSource
PopulationPeopleIdaho: 2,029,7332025 (estimate) · Census Bureau546,1412,029,7332025 (estimate)Census Bureau
Population densityPeople per square mileIdaho: 24.62025 (estimate) · Census Bureau519.024.62025 (estimate)Census Bureau
Population growth ratePercentIdaho: 1.4%2025 (estimate) · Census Bureau2.0%1.4%2025 (estimate)Census Bureau
Domestic migrationPeopleIdaho: 19,9152025 (estimate) · Census Bureau8,52819,9152025 (estimate)Census Bureau
Decennial census populationPeopleIdaho: 1,839,1062020 · Census Bureau494,9661,839,1062020Census Bureau
Population by race and Hispanic originPeopleIdaho: n/a2020–2024 (estimate) · Census Bureau419,728n/a2020–2024 (estimate)Census Bureau
Median ageYearsIdaho: 37.32020–2024 (estimate) · Census Bureau38.437.32020–2024 (estimate)Census Bureau

Housing and cost of living

MeasureAda CountyIdahoData periodSource
Median home valueDollarsIdaho: $418,6002020–2024 (estimate) · Census Bureau$512,300$418,6002020–2024 (estimate)Census Bureau
Median gross rentDollarsIdaho: $1,2382020–2024 (estimate) · Census Bureau$1,577$1,2382020–2024 (estimate)Census Bureau
Renters paying 30%+ of income on rentPercentIdaho: 46.9%2020–2024 (estimate) · Census Bureau49.0%46.9%2020–2024 (estimate)Census Bureau
Housing units authorized by building permitsCountIdaho: 17,9442025 (estimate) · Census Bureau5,22117,9442025 (estimate)Census Bureau
Subsidized housing units availableCountIdaho: 12,9422025 · HUD3,31012,9422025HUD

Jobs, wages and economy

MeasureAda CountyIdahoData periodSource
Median household incomeDollarsIdaho: $77,8002020–2024 (estimate) · Census Bureau$91,502$77,8002020–2024 (estimate)Census Bureau
Unemployment ratePercentIdaho: 3.7%2025 (estimate) · BLS3.3%3.7%2025 (estimate)BLS
Average annual wageDollarsIdaho: $62,3922025 · BLS$73,786$62,3922025BLS
Covered employmentPeopleIdaho: 874,2832025 · BLS295,234874,2832025BLS
Business establishmentsCountIdaho: 58,1002023 · Census Bureau17,02858,1002023Census Bureau
Poverty ratePercentIdaho: 10.6%2020–2024 (estimate) · Census Bureau8.3%10.6%2020–2024 (estimate)Census Bureau

Taxes, spending and government

MeasureAda CountyIdahoData periodSource
Average property tax rate by countyPercentIdaho: 0.680%2025 · Idaho Tax Commission0.652%0.680%2025Idaho Tax Commission
Ballots castCountIdaho: 917,4692024 · Idaho SOS271,186917,4692024Idaho SOS
Registered votersPeopleIdaho: 1,030,522September 2026 · Idaho SOS302,1321,030,522September 2026Idaho SOS

Education

MeasureAda CountyIdahoData periodSource
Public school enrollment by countyPeopleIdaho: n/a2024 · Idaho SDE79,841n/a2024Idaho SDE

Healthcare

MeasureAda CountyIdahoData periodSource
BirthsPeopleIdaho: 23,6952025 (estimate) · Census Bureau5,54923,6952025 (estimate)Census Bureau
Uninsured ratePercentIdaho: 9.1%2020–2024 (estimate) · Census Bureau6.4%9.1%2020–2024 (estimate)Census Bureau

Crime and public safety

MeasureAda CountyIdahoData periodSource
Group A offense ratePer 100,000 residentsIdaho: 3,166.522025 (preliminary) · Idaho State Police2,909.003,166.522025 (preliminary)Idaho State Police

Water

MeasureAda CountyIdahoData periodSource
Drought Severity and Coverage IndexIndexIdaho: 245October 6, 2026 · NDMC183245October 6, 2026NDMC
Irrigated landAcresIdaho: 3,167,4992022 · USDA NASS35,4793,167,4992022USDA NASS
Total water withdrawalsAcre-feetIdaho: 19,868,1562015 (estimate) · USGS355,65619,868,1562015 (estimate)USGS
Livestock water withdrawalsAcre-feetIdaho: 61,4802022 (estimate) · USGS1,54761,4802022 (estimate)USGS
Industrial water withdrawalsAcre-feetIdaho: 14,2422020 (estimate) · USGS1,23914,2422020 (estimate)USGS

Public lands, agriculture and wildfire

MeasureAda CountyIdahoData periodSource
FarmsCountIdaho: 22,8772022 · USDA NASS1,14222,8772022USDA NASS
Land in farmsAcresIdaho: 11,547,9632022 · USDA NASS112,55611,547,9632022USDA NASS
Market value of agricultural products soldDollarsIdaho: $10,892,201,0002022 · USDA NASS$191,322,000$10,892,201,0002022USDA NASS
Potato productionHundredweight (cwt)Idaho: 118,288,0002005 (estimate) · USDA NASS220,000118,288,0002005 (estimate)USDA NASS
Barley productionBushelsIdaho: 55,120,0002019 (estimate) · USDA NASS59,00055,120,0002019 (estimate)USDA NASS
Wildfires by countyCountIdaho: 1,5192025 · NIFC3911,5192025NIFC

Transportation and infrastructure

MeasureAda CountyIdahoData periodSource
Traffic deathsCountIdaho: 2382024 · NHTSA292382024NHTSA
Mean travel time to workMinutesIdaho: 21.62020–2024 (estimate) · Census Bureau21.221.62020–2024 (estimate)Census Bureau
County-maintained road milesMilesIdaho: 28,011.7512018 · ITD612.57228,011.7512018ITD

Compare every Idaho county side by side

Ada CountyAdams CountyBannock CountyBear Lake CountyBenewah CountyBingham CountyBlaine CountyBoise CountyBonner CountyBonneville CountyBoundary CountyButte CountyCamas CountyCanyon CountyCaribou CountyCassia CountyClark CountyClearwater CountyCuster CountyElmore CountyFranklin CountyFremont CountyGem CountyGooding CountyIdaho CountyJefferson CountyJerome CountyKootenai CountyLatah CountyLemhi CountyLewis CountyLincoln CountyMadison CountyMinidoka CountyNez Perce CountyOneida CountyOwyhee CountyPayette CountyPower CountyShoshone CountyTeton CountyTwin Falls CountyValley CountyWashington County
Ada County among Idaho’s 44 counties. Each county links to its page.

County facts

County seat
Boise
Established
Land area
1,052.254 sq mi, 519 per sq mi (2025)
Website
adacounty.id.gov

Source: Idaho Secretary of State, Blue Book of Idaho, 2025-2026.

Source: U.S. Census Bureau, Gazetteer Files, 2025 and 2026 (counties and states). Published .

The Boise River at Eagle.
The Boise River at Eagle. Photo: Michael Cooper.

Population

Population, Ada County, 2010 to 2025Population, Ada County, 2010 to 2025. Ada County: 393,354 in 2010, 546,141 in 2025.0200k400k600k20102020Ada CountyPeoplePopulation, Ada County, 2010 to 2025Population, Ada County, 2010 to 2025. Ada County: 393,354 in 2010, 546,141 in 2025.0200k400k600k2010201520202025Ada CountyPeoplePopulation, Ada County, 2010 to 2025Population, Ada County, 2010 to 2025. Ada County: 393,354 in 2010, 546,141 in 2025.0200k400k600k2010201520202025Ada CountyPeople

Source: U.S. Census Bureau, Population Estimates Program. Published .

Data table (16 rows)
PeriodAda County (people)
2010393,354
2011401,262
2012408,862
2013415,951
2014425,471
2015432,862
2016444,486
2017456,548
2018468,764
2019481,587
2020498,263
2021513,092
2022520,365
2023526,352
2024535,225
2025546,141

Unemployment rate

Unemployment rate, Ada County, 1990 to 2025Unemployment rate, Ada County, 1990 to 2025. Ada County: 3.7% in 1990, 3.3% in 2025.0.0%5.0%10.0%20002020Ada CountyPercentUnemployment rate, Ada County, 1990 to 2025Unemployment rate, Ada County, 1990 to 2025. Ada County: 3.7% in 1990, 3.3% in 2025.0.0%5.0%10.0%1990200020102020Ada CountyPercentUnemployment rate, Ada County, 1990 to 2025Unemployment rate, Ada County, 1990 to 2025. Ada County: 3.7% in 1990, 3.3% in 2025.0.0%5.0%10.0%1990200020102020Ada CountyPercent

Source: U.S. Bureau of Labor Statistics, Local Area Unemployment Statistics. Published .

Data table (36 rows)
PeriodAda County (percent)
19903.7%
19914.3%
19924.3%
19933.9%
19943.4%
19953.6%
19963.4%
19973.1%
19983.3%
19993.2%
20003.4%
20013.9%
20024.8%
20034.8%
20044.1%
20053.3%
20062.6%
20072.6%
20084.8%
20099.2%
20108.5%
20117.5%
20126.5%
20135.9%
20143.8%
20153.4%
20163.2%
20172.8%
20182.5%
20192.5%
20205.5%
20213.2%
20222.4%
20232.8%
20243.2%
20253.3%

Average annual wage

Average annual wage, Ada County, 2001 to 2025Average annual wage, Ada County, 2001 to 2025. Ada County: $33,081 in 2001, $73,786 in 2025.$0$20k$40k$60k$80k20102020Ada CountyDollarsAverage annual wage, Ada County, 2001 to 2025Average annual wage, Ada County, 2001 to 2025. Ada County: $33,081 in 2001, $73,786 in 2025.$0$20k$40k$60k$80k20102020Ada CountyDollarsAverage annual wage, Ada County, 2001 to 2025Average annual wage, Ada County, 2001 to 2025. Ada County: $33,081 in 2001, $73,786 in 2025.$0$20k$40k$60k$80k20052010201520202025Ada CountyDollars

Source: U.S. Bureau of Labor Statistics, Quarterly Census of Employment and Wages, annual averages. Published .

Data table (25 rows)
PeriodAda County (dollars)
2001$33,081
2002$33,658
2003$34,160
2004$35,712
2005$36,838
2006$39,192
2007$40,125
2008$39,671
2009$39,817
2010$40,783
2011$41,357
2012$41,846
2013$43,069
2014$44,905
2015$45,312
2016$46,017
2017$48,536
2018$50,463
2019$51,969
2020$56,192
2021$59,685
2022$63,343
2023$65,345
2024$70,588
2025$73,786

In this county

PlaceWhat it is
Boise River at Glenwood Bridge near BoiseUSGS river gage

A gage sits in the county the U.S. Geological Survey assigns it.

County officials

OfficeNameParty
Commissioner, District 1Ryan DavidsonR
Commissioner, District 2Rod W. BeckR
Commissioner, District 3Tom DayleyR
AssessorRebecca ArnoldR
ClerkTrent TrippleR
CoronerRichard D. RiffleR
ProsecutorJan M. BennettsR
SheriffMatt CliffordR
TreasurerElizabeth “Beth” MahnR

Source: Idaho Secretary of State, Blue Book of Idaho, 2025-2026.

Representation

Legislative districts

DistrictSenatorRepresentative, Seat ARepresentative, Seat B
10 (part)Tammy Nichols (R)Mike Moyle (R), Speaker of the HouseBruce D. Skaug (R)
14 (part)C. Scott Grow (R)Ted Hill (R)Josh Tanner (R)
15 (part)Codi Galloway (R)Steve Berch (D), Assistant Minority LeaderDori Healey (R)
16 (part)Alison “Ali” Rabe (D)Soñia R. Galaviz (D)Anne Henderson Haws (D)
17 (part)Carrie Semmelroth (D)John Gannon (D)Megan Egbert (D)
18 (part)Janie Ward-Engelking (D), Minority Caucus ChairIlana Rubel (D), Minority LeaderBrooke Green (D)
19 (part)Melissa Wintrow (D), Minority LeaderMonica C. Church (D), Minority Caucus ChairChris Mathias (D)
20 (part)Josh Keyser (R)Joe A. Palmer (R)James Holtzclaw (R)
21 (part)Treg A. Bernt (R)James Petzke (R)Jeff Ehlers (R)
22 (part)Lori Den Hartog (R), Majority LeaderJohn Vander Woude (R)Jason A. Monks (R), Majority Leader
23 (part)Todd M. Lakey (R)Chris Bruce (R)Shawn Dygert (R)

A district marked part covers a portion of the county; the rest of the county is in the other districts listed.

Congress

Congressional District 1 (part)
Russ Fulcher (R)
Congressional District 2 (part)
Michael K. Simpson (R)
U.S. Senate
James E. Risch (R); Mike Crapo (R)

Source: Idaho Legislature, Reapportionment plans L03 and C03, 2021. Published .

Source: Idaho Legislature, Senate and House membership.

Source: Clerk of the U.S. House of Representatives, Member lists of the House and Senate. Published .

This page was last updated .