Adams County, Idaho Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 39th-largest in Idaho
The population of Adams County, Idaho is 4,599 as of the 2023 American Community Survey, making it the 39th-largest county in Idaho. The median household income is $59,286, the median home value is $327,300, and the median age is 54.3.
The population of Adams County has grown 26.1% since 2010 (3,962 → 4,998), a +1.67% annualized rate.
4,599
Population
+1.67%
Annual growth
3
People / sq mi
$59,286
Median Income
$327,300
Median Home Value
Adams County covers 1,363 sq mi of land at 3.4 people per square mile.
About Adams County, ID
Adams County skews on age — the median resident is 54.3, older than the national median. Adams County is a county in Idaho with a population of 4,599. It ranks #39 among counties in Idaho by population.
The typical household here earns about $59,286, below the US median of $78,538. The poverty rate is 11.2%, below the national 12.4%. A typical home is worth $327,300, with typical rent around $823.
Degree attainment is mid-range for US counties: 21.3% of adults hold a four-year degree, below the national 35.0%. An unusually large 15.3% of workers are remote, above the national 14.0%, and the average commute runs about 23 minutes each way.
The age structure shapes everything downstream in Adams County — from housing demand to the mix of working-age earners reflected in the income figures above.
Adams County Population History (2010-2024)
The county of Adams County had a population of 3,962 in 2010 and 4,998 in 2024, a 26.1% growth over 14 years. The peak was 4,998 in 2024. Average annual growth rate: 1.69%.
4,998
Population (2024)
3,962
Population (2010)
4,998
Peak (2024)
1.69%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 3,962 |
| 2011 | 3,981 |
| 2012 | 3,907 |
| 2013 | 3,865 |
| 2014 | 3,884 |
| 2015 | 3,891 |
| 2016 | 3,944 |
| 2017 | 4,128 |
| 2018 | 4,215 |
| 2019 | 4,265 |
| 2020 | 4,425 |
| 2021 | 4,621 |
| 2022 | 4,780 |
| 2023 | 4,898 |
| 2024 | 4,998 |
Race & Ethnicity
| White | 91.6% |
| Black or African American | 0.2% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 5.0% |
| Two or More Races | 0.0% |
Age & Sex
54.3
Median Age
48.7%
Female
51.3%
Male
30.4%
Age 65+
Age Distribution
Children (under 15): 13.7% · Seniors (65+): 30.4%
Income & Poverty
| Median household income | $59,286$-15,350 vs state |
| Mean household income | $88,154 |
| Per-capita income | $36,308 |
| Poverty rate | 11.2%+4.2% vs state |
| Unemployment rate | 3.2% |
| Employment-to-population | 45.6% |
Top Industries by Employment
The largest employment sector in Adams County is construction, accounting for 14.7% of workers.
How residents commute
0.0%
Drive alone
3.0%
Carpool
70.2%
Public transit
15.3%
Work from home
22.7 min
Avg commute
Housing
$327,300$-48,700 vs state
Median home value
$823
Median rent
83.1%
Homeownership rate
2,666
Total housing units
65.7%
Occupied
34.3%
Vacant
16.9%
Renter-occupied
Social & access
88.1%
With health insurance
92.8%
With broadband internet
57.9%
Foreign-born
10.8%
Veterans (18+)
15.6%
With a disability
98.4%
Speak language other than English at home
Education
92.9%
High School+
21.3%
Bachelor's+
Largest cities in Idaho
Other counties in Idaho
Part of Idaho
Metro areas in Idaho
County rankings
Frequently Asked Questions
Adams County, Idaho has a population of 4,599 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 39th-largest county in Idaho. Population density is 3 people per square mile.
The population of Adams County has grown 26.1% since 2010 (3,962 → 4,998), a +1.67% annualized rate.
The median household income in Adams County, Idaho is $59,286, with mean (average) household income of $88,154 and per-capita income of $36,308. 11.2% of residents live below the federal poverty level.
In Adams County, the largest racial and ethnic groups are White (91.6%), Hispanic or Latino (5.0%), Black or African American (0.2%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Adams County, Idaho is 54.3 years. Residents are 48.7% female and 51.3% male.
The median home value in Adams County is $327,300 and median monthly rent is $823. 83.1% of occupied housing units are owner-occupied. The county has 2,666 total housing units, 34.3% of which are vacant.
The largest employment sector in Adams County, Idaho is construction, employing 14.7% of workers. The unemployment rate is 3.2%.
Boise City is among the largest cities associated with Adams County, Idaho, with a population of 235,701.
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Statewide data for Idaho
Population, race, income, age, and trends across Idaho
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.