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
Housing cost is the defining feature of Blaine County: the median home is valued at $663,800. Blaine County is a county in Idaho with a population of 24,579. It ranks #17 among counties in Idaho by population.
Households take in a median $84,470, comfortably above the US median of $78,538. Poverty is relatively low for US counties at 5.1%, below the national 12.4%. Housing is expensive: the median home is worth $663,800, with typical rent around $1,217.
Blaine County is among the best-educated US counties: 45.5% of adults 25 and older hold a bachelor’s degree, above the national 35.0%. A solid 13.3% of workers are based at home, close to the national 14.0%, and the average commute runs about 18 minutes each way.
High housing values reframe the income picture in Blaine County — even solid earnings stretch less against home prices and rents at this level.
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.
Blaine County, ID Climate
Blaine County, ID has an average annual temperature of 6°C (43°F) and receives about 372 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
6°C
Avg Temp
372
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -7° / 19° | 48 mm |
| February | -4° / 24° | 36 mm |
| March | 0° / 32° | 33 mm |
| April | 5° / 41° | 25 mm |
| May | 10° / 49° | 36 mm |
| June | 14° / 58° | 30 mm |
| July | 19° / 66° | 16 mm |
| August | 19° / 66° | 18 mm |
| September | 14° / 57° | 21 mm |
| October | 8° / 46° | 20 mm |
| November | 0° / 32° | 41 mm |
| December | -6° / 21° | 48 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 Blaine County, ID
The most comfortable months to visit Blaine County, ID are typically July, August and June, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 29°C high). The coldest is January (near -13°C low). January is usually the wettest month.
Where to stay near Blaine County
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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.