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.
Adams County, ID Climate
Adams County, ID has an average annual temperature of 7.1°C (45°F) and receives about 606 mm of precipitation per year. The warmest month is August and the coldest is January. Figures are 1970–2000 climate normals.
7.1°C
Avg Temp
606
Precip (mm/yr)
Aug
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -4° / 24° | 80 mm |
| February | -2° / 28° | 61 mm |
| March | 2° / 35° | 57 mm |
| April | 6° / 43° | 47 mm |
| May | 10° / 51° | 50 mm |
| June | 15° / 58° | 45 mm |
| July | 19° / 66° | 18 mm |
| August | 19° / 67° | 20 mm |
| September | 14° / 58° | 31 mm |
| October | 9° / 47° | 41 mm |
| November | 1° / 35° | 72 mm |
| December | -4° / 25° | 84 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Adams County, ID
The most comfortable months to visit Adams County, ID are typically August, July and September, when temperatures are mildest and rainfall is relatively low. The hottest month is August (around 30°C high). The coldest is January (near -10°C low). December is usually the wettest month.
Where to stay near Adams County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.