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Ada County, ID
8 cities and towns and 16 ZIP codes in Ada County, Idaho.
Population
518,935
Land area
1,052sq mi
People per sq mi
493
ZIP codes
16
Cities and towns in Ada County
Ada County at a glance
- Ada County is about 21 times as dense as Idaho as a whole.
- No county in Idaho has more people.
- The median household income is $91,502, 18% above the Idaho median of $77,800.
- A typical owner-occupied home is valued at $512,300 (22% above Idaho) and median rent is $1,577 a month.
- Its largest cities are Boise City (237,242), Meridian (130,138) and Eagle (32,855).
Local data for Ada County, ID
Counts from official public data
- Hospitals7
- Emergency Rooms3
- Nursing Homes13
- Schools185
- Colleges10
- Libraries18
- Banks112
- Post Offices14
- Parks208
- Grocery Stores120
- Restaurants1,440
- Affordable Housing23
- Home Health Agencies11
- Hospice Care15
- Dialysis Centers5
- Rehab & Long-Term Care Hospitals2
- Community Health Centers21
- Mental Health & Addiction Treatment76
- Private Schools31
- Community Colleges & Trade Schools6
- Toxic Release Facilities16
- Historic Places136
Housing and community stats
Ada County, ID, American Community Survey 2020-2024
Median household income
$91,502
Poverty rate
8.3%
Median home value
$512,300
Prices +2.7% in a year
Median rent
$1,577/mo
Homeownership
70.8%
Bachelor's or higher
44.6%
Median age
38.4
Average commute
21.2 min
Largest reported origins and ancestries: German Americans (93,607), Irish Americans (59,205), Mexican Americans (36,231).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
3.3%
Aug 2026, 0.0 pts in a year
Average annual pay
$73,786
295,234 jobs, 2025
Income per person
$76,921
BEA, 2024
Federal spending
$4.74B
FY 2026, $9,579 per person
PPP loans
$1.18B
15,836 loans, 145,732 jobs reported
Campaign donations
$4.77M
Itemized, 2026 cycle
How people get to work
Ada County, ID, workers 16 and older. American Community Survey 5-year estimates
- Drove alone69.3%
- Carpooled7.1%
- Public transit0.3%
- Walked2.1%
- Bicycle1.3%
- Taxi, ride-hailing, motorcycle or other1.4%
- Worked from home18.5%
Average one-way commute: 21.2 minutes for people who do not work from home.
Environment and hazard risk
Ada County, ID, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Moderate
Top: winter weather
Storm events since 1996
247
Most often thunderstorm wind
Flood insurance policies
1,541
0.9% of homes, county
July high / Jan low
93° / 26°F
11.5 inches of rain a year
Hazards, floods and storm historyCheck a flood zone136 historic places
Health statistics
Share of adults in Ada County, ID, CDC PLACES estimates
Obesity
29.0%
U.S. 33.3% -4.3 pts
Diabetes
9.0%
U.S. 12.1% -3.1 pts
Smoking
10.4%
U.S. 12.8% -2.4 pts
Uninsured (18-64)
8.5%
U.S. 11.1% -2.6 pts
Cities, towns and ZIP codes in Ada County
Population shown
Frequently asked questions
- What is the largest city in Ada County, ID?
- Boise City is the largest city or town in Ada County, with about 237,242 residents.
- How many ZIP codes are in Ada County?
- Ada County includes 16 ZIP Code Tabulation Areas, including 83616, 83634, 83642, 83646, 83669.
- What is the population of Ada County, ID?
- About 518,935 people live in Ada County, based on American Community Survey 5-year estimates.
- What counties border Ada County?
- Ada County borders Canyon County, Elmore County, Gem County, Owyhee County, Boise County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023