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
What distinguishes Idaho County is density: among the most sparsely settled of US counties, around 2 people per square mile. With 17,120 residents, Idaho County is a county in Idaho. It ranks #20 among counties in Idaho by population.
The typical household here earns about $60,975, below the US median of $78,538. About 7.8% of residents live below the federal poverty level, below the national 12.4%. A typical home is worth $284,600, with typical rent around $797.
Degree attainment is mid-range for US counties: 22.0% of adults hold a four-year degree, below the national 35.0%. Around 9.4% of workers work from home, below the national 14.0%, and the average commute runs about 20 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.
Idaho County, ID Climate
Idaho County, ID has an average annual temperature of 4.9°C (41°F) and receives about 742 mm of precipitation per year. The warmest month is July and the coldest is December. Figures are 1970–2000 climate normals.
4.9°C
Avg Temp
742
Precip (mm/yr)
Jul
Hottest Month
Dec
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -5° / 23° | 87 mm |
| February | -3° / 27° | 61 mm |
| March | 1° / 33° | 66 mm |
| April | 4° / 39° | 61 mm |
| May | 8° / 47° | 78 mm |
| June | 12° / 54° | 72 mm |
| July | 15° / 60° | 34 mm |
| August | 15° / 59° | 37 mm |
| September | 11° / 51° | 49 mm |
| October | 6° / 42° | 51 mm |
| November | -1° / 31° | 69 mm |
| December | -5° / 23° | 77 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 Idaho County, ID
The most comfortable months to visit Idaho County, ID are typically July, August and June, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 25°C high). The coldest is December (near -11°C low). January is usually the wettest month.
Where to stay near Idaho County
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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.