Idaho County, Idaho Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 20th-largest in Idaho
The population of Idaho County, Idaho is 17,120 as of the 2023 American Community Survey, making it the 20th-largest county in Idaho. The median household income is $60,975, the median home value is $284,600, and the median age is 49.6.
The population of Idaho County has grown 9.8% since 2010 (16,311 → 17,912), a +0.67% annualized rate.
17,120
Population
+0.67%
Annual growth
2
People / sq mi
$60,975
Median Income
$284,600
Median Home Value
Idaho County covers 8,477 sq mi of land at 2.0 people per square mile.
About Idaho County, ID
Idaho County is a county in Idaho with a population of 17,120. It ranks #20 among counties in Idaho by population. The median age is 49.6, older than the national median. The population is 52.3% male and 47.7% female.
The median household income in Idaho County is $60,975, below the US median of $74,580. 7.8% of residents live below the federal poverty level. Home values sit at a median of $284,600, with monthly rent averaging $797. The homeownership rate of 80.1% is higher than the national rate of 64.8%.
Educational attainment in Idaho County reflects 22.0% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 9.4% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 19.7 minutes each way.
Idaho County Population History (2010-2024)
The county of Idaho County had a population of 16,311 in 2010 and 17,912 in 2024, a 9.8% growth over 14 years. The peak was 17,928 in 2023. Average annual growth rate: 0.68%.
17,912
Population (2024)
16,311
Population (2010)
17,928
Peak (2023)
0.68%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 16,311 |
| 2011 | 16,465 |
| 2012 | 16,448 |
| 2013 | 16,256 |
| 2014 | 16,285 |
| 2015 | 16,312 |
| 2016 | 16,247 |
| 2017 | 16,392 |
| 2018 | 16,469 |
| 2019 | 16,623 |
| 2020 | 16,590 |
| 2021 | 17,059 |
| 2022 | 17,670 |
| 2023 | 17,928 |
| 2024 | 17,912 |
Race & Ethnicity
| White | 91.6% |
| Black or African American | 0.1% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 4.7% |
| Two or More Races | 0.0% |
Age & Sex
49.6
Median Age
47.7%
Female
52.3%
Male
28.6%
Age 65+
Age Distribution
Children (under 15): 16.0% · Seniors (65+): 28.6%
Income & Poverty
| Median household income | $60,975$-13,661 vs state |
| Mean household income | $77,479 |
| Per-capita income | $32,073 |
| Poverty rate | 7.8%+0.8% vs state |
| Unemployment rate | 1.8% |
| Employment-to-population | 47.8% |
Top Industries by Employment
The largest employment sector in Idaho County is professional & business services, accounting for 21.9% of workers.
How residents commute
0.0%
Drive alone
6.4%
Carpool
72.3%
Public transit
9.4%
Work from home
19.7 min
Avg commute
Housing
$284,600$-91,400 vs state
Median home value
$797
Median rent
80.1%
Homeownership rate
8,881
Total housing units
73.9%
Occupied
26.1%
Vacant
19.9%
Renter-occupied
Social & access
84.7%
With health insurance
92.7%
With broadband internet
48.5%
Foreign-born
10.7%
Veterans (18+)
16.3%
With a disability
95.2%
Speak language other than English at home
Education
91.8%
High School+
22.0%
Bachelor's+
Largest cities in Idaho
Other counties in Idaho
Part of Idaho
Metro areas in Idaho
County rankings
Frequently Asked Questions
Idaho County, Idaho has a population of 17,120 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 20th-largest county in Idaho. Population density is 2 people per square mile.
The population of Idaho County has grown 9.8% since 2010 (16,311 → 17,912), a +0.67% annualized rate.
The median household income in Idaho County, Idaho is $60,975, with mean (average) household income of $77,479 and per-capita income of $32,073. 7.8% of residents live below the federal poverty level.
In Idaho County, the largest racial and ethnic groups are White (91.6%), Hispanic or Latino (4.7%), Black or African American (0.1%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Idaho County, Idaho is 49.6 years. Residents are 47.7% female and 52.3% male.
The median home value in Idaho County is $284,600 and median monthly rent is $797. 80.1% of occupied housing units are owner-occupied. The county has 8,881 total housing units, 26.1% of which are vacant.
The largest employment sector in Idaho County, Idaho is professional, scientific, and management services, employing 21.9% of workers. The unemployment rate is 1.8%.
Boise City is among the largest cities associated with Idaho County, Idaho, with a population of 235,701.
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Full rankings of Idaho counties
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.