Boundary County, Idaho Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 25th-largest in Idaho
The population of Boundary County, Idaho is 12,695 as of the 2023 American Community Survey, making it the 25th-largest county in Idaho. The median household income is $62,438, the median home value is $344,100, and the median age is 42.8.
The population of Boundary County has grown 27.7% since 2010 (10,998 → 14,040), a +1.76% annualized rate.
12,695
Population
+1.76%
Annual growth
10
People / sq mi
$62,438
Median Income
$344,100
Median Home Value
Boundary County covers 1,269 sq mi of land at 10.0 people per square mile.
About Boundary County, ID
Boundary County is a county in Idaho with a population of 12,695. It ranks #25 among counties in Idaho by population. The median age is 42.8, older than the national median. The population is 51.1% male and 48.9% female.
The median household income in Boundary County is $62,438, below the US median of $74,580. 16.4% of residents live below the federal poverty level. Home values sit at a median of $344,100, with monthly rent averaging $867. The homeownership rate of 78.0% is higher than the national rate of 64.8%.
Educational attainment in Boundary County reflects 19.6% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 8.5% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 20.6 minutes each way.
Boundary County Population History (2010-2024)
The county of Boundary County had a population of 10,998 in 2010 and 14,040 in 2024, a 27.7% growth over 14 years. The peak was 14,040 in 2024. Average annual growth rate: 1.78%.
14,040
Population (2024)
10,998
Population (2010)
14,040
Peak (2024)
1.78%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 10,998 |
| 2011 | 10,822 |
| 2012 | 10,816 |
| 2013 | 10,856 |
| 2014 | 10,963 |
| 2015 | 11,310 |
| 2016 | 11,714 |
| 2017 | 11,995 |
| 2018 | 12,073 |
| 2019 | 12,340 |
| 2020 | 12,141 |
| 2021 | 12,627 |
| 2022 | 13,377 |
| 2023 | 13,677 |
| 2024 | 14,040 |
Race & Ethnicity
| White | 88.8% |
| Black or African American | 0.7% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 3.2% |
| Two or More Races | 0.0% |
Age & Sex
42.8
Median Age
48.9%
Female
51.1%
Male
23.5%
Age 65+
Age Distribution
Children (under 15): 19.2% · Seniors (65+): 23.5%
Income & Poverty
| Median household income | $62,438$-12,198 vs state |
| Mean household income | $75,791 |
| Per-capita income | $29,672 |
| Poverty rate | 16.4%+9.4% vs state |
| Unemployment rate | 1.7% |
| Employment-to-population | 48.3% |
Top Industries by Employment
The largest employment sector in Boundary County is professional & business services, accounting for 13.6% of workers.
How residents commute
0.0%
Drive alone
4.9%
Carpool
74.4%
Public transit
8.5%
Work from home
20.6 min
Avg commute
Housing
$344,100$-31,900 vs state
Median home value
$867
Median rent
78.0%
Homeownership rate
5,535
Total housing units
87.4%
Occupied
12.6%
Vacant
22.0%
Renter-occupied
Social & access
86.4%
With health insurance
95.1%
With broadband internet
62.3%
Foreign-born
11.8%
Veterans (18+)
17.9%
With a disability
93.3%
Speak language other than English at home
Education
87.2%
High School+
19.6%
Bachelor's+
Largest cities in Idaho
Other counties in Idaho
Part of Idaho
Metro areas in Idaho
County rankings
Frequently Asked Questions
Boundary County, Idaho has a population of 12,695 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 25th-largest county in Idaho. Population density is 10 people per square mile.
The population of Boundary County has grown 27.7% since 2010 (10,998 → 14,040), a +1.76% annualized rate.
The median household income in Boundary County, Idaho is $62,438, with mean (average) household income of $75,791 and per-capita income of $29,672. 16.4% of residents live below the federal poverty level.
In Boundary County, the largest racial and ethnic groups are White (88.8%), Hispanic or Latino (3.2%), Black or African American (0.7%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Boundary County, Idaho is 42.8 years. Residents are 48.9% female and 51.1% male.
The median home value in Boundary County is $344,100 and median monthly rent is $867. 78.0% of occupied housing units are owner-occupied. The county has 5,535 total housing units, 12.6% of which are vacant.
The largest employment sector in Boundary County, Idaho is professional, scientific, and management services, employing 13.6% of workers. The unemployment rate is 1.7%.
Boise City is among the largest cities associated with Boundary 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.