County · Idaho
Ada County, Idaho
Ada County, Idaho. Ada County had 546,141 residents in 2025 by the Census Bureau's estimate, up 10.3% since 2020, in line with Idaho (+10.4%). It holds 8 places (6 cities, villages and boroughs and 2 census-designated) and 129 census tracts. GEOID 16001.
Ada County is one of the 5 counties of the Boise City, ID metropolitan statistical area (the Census Bureau's July 2023 delineation).
Residents, July 2025 estimate
546,141
Census Bureau estimate (no margin published)
2020 Census count: 494,967 · ACS 2020-2024: 518,935
Median household income
$91,502
±$1,355 (90% margin)
Idaho: $77,800
Median home value
$512,300
±$8,186 (90% margin)
Idaho: $418,600
Median gross rent
$1,577
±$32 (90% margin)
Idaho: $1,238
How many people live in Ada County, and is it growing?
The 2020 Census counted 494,967 residents in Ada County. The Census Bureau estimates 546,141 for July 1, 2025, up 10.3% since 2020, in line with Idaho (+10.4%). The 2020-2024 American Community Survey puts the population at 518,935 over 1,052 square miles of land.
| Measure | Ada County | Idaho | Change since 2015-2019 |
|---|---|---|---|
| Total population | 518,935 | 1,934,262 | +62,086 |
| Households | 202,543±934 | 713,005 | +29,190 |
| Average household size | 2.49±0.01 | 2.64 | −0.09 |
| Housing units | 211,440±130 | 795,014 | +29,907 |
Ada County's population since 2000
From 300,904 in 2000 to 546,141 in 2025: up 81.5%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Ada County?
Ada County holds 8 places: 6 cities, villages and boroughs (incorporated places) and 2 census-designated places. The largest is Boise City with 238,429 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Boise City | 235,684 | $83,904 |
|---|---|---|
| Meridian | 117,635 | $100,795 |
| Eagle | 30,346 | $122,894 |
| Kuna | 24,011 | $96,219 |
| Garden City | 12,316 | $70,124 |
| Star | 11,117 | $97,936 |
| Hidden Springs | 3,076 | $163,203 |
| AvimorGEOID 1604105 | 1,255 | $94,306 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Ada County?
The median resident of Ada County is 38.4 years old; 22.0% are under 18 and 16.2% are 65 or older. The largest group is non-Hispanic white residents at 80.9%, then Hispanic or Latino residents (of any race) at 9.8%. 6.2% of residents were born outside the United States.
| Measure | Ada County | Idaho | Change since 2015-2019 |
|---|---|---|---|
| Median age | 38.4±0.2 | 37.3 | +1.4 |
| Under 18 years | 22.0% | 24.1% | – |
| 65 years and over | 16.2%±0.1 pts | 17.0% | – |
| Hispanic or Latino (any race) | 9.8% | 13.6% | +1.6 pts |
| White alone, not Hispanic | 80.9%±0.3 pts | 78.6% | −3.8 pts |
| Black or African American alone, not Hispanic | 1.3%±0.1 pts | 0.7% | no clear change |
| Asian alone, not Hispanic | 2.7%±0.1 pts | 1.3% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.3%±0.1 pts | 0.7% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.2%±0.1 pts | 0.1% | – |
| Two or more races, not Hispanic | 4.3%±0.3 pts | 4.2% | – |
| Some other race alone, not Hispanic | 0.5%±0.1 pts | 0.6% | – |
| Born outside the United States | 6.2%±0.3 pts | 5.9% | no clear change |
| Speak a language other than English at home (age 5+) | 9.3%±0.4 pts | 11.0% | – |
| Civilian veterans (age 18+) | 7.8%±0.3 pts | 8.0% | – |
| With a disability | 11.8%±0.4 pts | 14.1% | – |
| No health insurance coverage | 6.4%±0.4 pts | 9.1% | −1.9 pts |
| High school graduate or higher (age 25+) | 95.2%±0.3 pts | 91.9% | – |
| Bachelor's degree or higher (age 25+) | 44.6%±0.7 pts | 31.8% | +6.1 pts |
| Graduate or professional degree (age 25+) | 15.6%±0.6 pts | 10.5% | – |
| Moved from another state in the past year | 5.1%±0.4 pts | 4.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Ada County earn?
Half of Ada County's 202,543 households earn less than $91,502 a year (±$1,355), against $77,800 in Idaho. In 2015-2019 the median was $81,586 in 2024 dollars, so it rose by $9,916 after inflation. 8.3% of residents live below the poverty line.
| Measure | Ada County | Idaho | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $91,502±$1,355 | $77,800 | +$9,916 |
| Mean household income | $124,631±$2,616 | $102,747 | – |
| Per capita income | $49,757±$1,078 | $38,952 | +$6,782 |
| People below the poverty line | 8.3%±0.6 pts | 10.6% | −2.5 pts |
| Children under 18 below the poverty line | 8.5%±1.2 pts | 12.4% | −3.2 pts |
| Households receiving SNAP | 5.1%±0.4 pts | 7.6% | – |
| Households with a broadband subscription | 94.7%±0.4 pts | 91.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Ada County?
Owners occupy 70.8% of Ada County's occupied homes and renters 29.2%. The median owner-occupied home is valued at $512,300 by its owner (±$8,186). The median renter pays $1,577 a month including utilities, and 38.5% of renters pay 35% or more of their income on rent.
| Measure | Ada County | Idaho | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $512,300±$8,186 | $418,600 | +$179,028 |
| Median gross rent | $1,577±$32 | $1,238 | +$352 |
| Renters paying 35% or more of income on rent | 38.5%±2.1 pts | 36.9% | no clear change |
| Median monthly owner costs, with a mortgage | $1,905±$24 | $1,687 | – |
| Owner-occupied homes | 70.8%±0.8 pts | 72.1% | +1.5 pts |
| Housing units | 211,440±130 | 795,014 | +29,907 |
| Homeowner vacancy rate | 0.6%±0.2 pts | 0.7% | – |
| Rental vacancy rate | 4.1%±0.7 pts | 3.9% | – |
| Single-family detached homes | 74.1%±0.7 pts | 73.8% | – |
| Mobile homes | 2.7%±0.3 pts | 6.9% | – |
| Built 2020 or later | 5.7%±0.4 pts | 3.9% | – |
| Built 1939 or earlier | 3.9%±0.3 pts | 7.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Ada County building?
Builders took permits for 5,221 new housing units across Ada County in 2025 (4,637 single-family), 9.6 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Ada County get to work?
69.3% of Ada County's workers drive alone and 18.5% work from home. The average trip to work takes 21.2 minutes. The unemployment rate in 2020-2024 averaged 3.1%.
| Measure | Ada County | Idaho | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 65.8%±0.5 pts | 63.0% | – |
| Unemployment rate | 3.1%±0.4 pts | 3.7% | −0.8 pts |
| Drove alone to work | 69.3%±0.7 pts | 72.7% | – |
| Carpooled | 7.1%±0.5 pts | 8.9% | – |
| Public transportation | 0.3%±0.1 pts | 0.5% | – |
| Walked | 2.1%±0.3 pts | 2.6% | – |
| Worked from home | 18.5%±0.7 pts | 13.3% | +11.2 pts |
| Mean travel time to work | 21.2 min±0.3 | 21.6 min | +0.5 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are Ada County's census tracts?
Ada County is divided into 129 census tracts. Among those with a reliable estimate, median household income runs from $22,048 (Tract 1.01) to $200,652 (Tract 7.03).
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Ada County compare with Idaho's other counties?
| Measure | Rank |
|---|---|
| Population | 1st of 44 |
| Growth 2020-2025 | 14th of 44 |
| Residents per square mile | 1st of 44 |
| Median household income | 3rd of 44 |
| Median home value | 5th of 44 |
| Median gross rent | 1st of 44 |
| Poverty rate | 39th of 43 |
| Bachelor's degree or higher | 3rd of 44 |
| Median age | 26th of 44 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Ada County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.