Blaine County, Idaho Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 17th-largest in Idaho
The population of Blaine County, Idaho is 24,579 as of the 2023 American Community Survey, making it the 17th-largest county in Idaho. The median household income is $84,470, the median home value is $663,800, and the median age is 45.5.
The population of Blaine County has grown 18.6% since 2010 (21,296 → 25,261), a +1.23% annualized rate.
24,579
Population
+1.23%
Annual growth
9
People / sq mi
$84,470
Median Income
$663,800
Median Home Value
Blaine County covers 2,638 sq mi of land at 9.3 people per square mile.
About Blaine County, ID
Blaine County is a county in Idaho with a population of 24,579. It ranks #17 among counties in Idaho by population. The median age is 45.5, older than the national median. The population is 52.6% male and 47.4% female.
The median household income in Blaine County is $84,470, above the US median of $74,580. 5.1% of residents live below the federal poverty level. Home values sit at a median of $663,800, with monthly rent averaging $1,217. The homeownership rate of 75.5% is higher than the national rate of 64.8%.
Educational attainment in Blaine County reflects 45.5% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 13.3% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 17.7 minutes each way.
Blaine County Population History (2010-2024)
The county of Blaine County had a population of 21,296 in 2010 and 25,261 in 2024, a 18.6% growth over 14 years. The peak was 25,261 in 2024. Average annual growth rate: 1.24%.
25,261
Population (2024)
21,296
Population (2010)
25,261
Peak (2024)
1.24%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 21,296 |
| 2011 | 21,085 |
| 2012 | 21,131 |
| 2013 | 21,333 |
| 2014 | 21,471 |
| 2015 | 21,659 |
| 2016 | 22,069 |
| 2017 | 22,401 |
| 2018 | 22,736 |
| 2019 | 23,012 |
| 2020 | 24,345 |
| 2021 | 24,784 |
| 2022 | 25,186 |
| 2023 | 25,180 |
| 2024 | 25,261 |
Race & Ethnicity
| White | 80.3% |
| Black or African American | 0.5% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.9% |
| Two or More Races | 0.0% |
Age & Sex
45.5
Median Age
47.4%
Female
52.6%
Male
21.9%
Age 65+
Age Distribution
Children (under 15): 15.6% · Seniors (65+): 21.9%
Income & Poverty
| Median household income | $84,470+$9,834 vs state |
| Mean household income | $121,425 |
| Per-capita income | $51,123 |
| Poverty rate | 5.1%-1.9% vs state |
| Unemployment rate | 1.8% |
| Employment-to-population | 66.1% |
Top Industries by Employment
The largest employment sector in Blaine County is education & health care, accounting for 18.0% of workers.
How residents commute
1.0%
Drive alone
3.3%
Carpool
71.0%
Public transit
13.3%
Work from home
17.7 min
Avg commute
Housing
$663,800+$287,800 vs state
Median home value
$1,217
Median rent
75.5%
Homeownership rate
15,769
Total housing units
62.3%
Occupied
37.7%
Vacant
24.5%
Renter-occupied
Social & access
89.7%
With health insurance
98.3%
With broadband internet
52.6%
Foreign-born
7.7%
Veterans (18+)
11.7%
With a disability
76.6%
Speak language other than English at home
Education
91.2%
High School+
45.5%
Bachelor's+
Largest cities in Idaho
Other counties in Idaho
Part of Idaho
Metro areas in Idaho
County rankings
Frequently Asked Questions
Blaine County, Idaho has a population of 24,579 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 17th-largest county in Idaho. Population density is 9 people per square mile.
The population of Blaine County has grown 18.6% since 2010 (21,296 → 25,261), a +1.23% annualized rate.
The median household income in Blaine County, Idaho is $84,470, with mean (average) household income of $121,425 and per-capita income of $51,123. 5.1% of residents live below the federal poverty level.
In Blaine County, the largest racial and ethnic groups are White (80.3%), Hispanic or Latino (1.9%), Black or African American (0.5%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Blaine County, Idaho is 45.5 years. Residents are 47.4% female and 52.6% male.
The median home value in Blaine County is $663,800 and median monthly rent is $1,217. 75.5% of occupied housing units are owner-occupied. The county has 15,769 total housing units, 37.7% of which are vacant.
The largest employment sector in Blaine County, Idaho is education, health care, and social assistance, employing 18.0% of workers. The unemployment rate is 1.8%.
Boise City is among the largest cities associated with Blaine 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.