Carbon County, Montana Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 20th-largest in Montana
The population of Carbon County, Montana is 10,877 as of the 2023 American Community Survey, making it the 20th-largest county in Montana. The median household income is $71,017, the median home value is $379,300, and the median age is 50.5.
The population of Carbon County has grown 14.3% since 2010 (10,063 → 11,498), a +0.96% annualized rate.
10,877
Population
+0.96%
Annual growth
5
People / sq mi
$71,017
Median Income
$379,300
Median Home Value
Carbon County covers 2,048 sq mi of land at 5.3 people per square mile.
About Carbon County, MT
Carbon County is a county in Montana with a population of 10,877. It ranks #20 among counties in Montana by population. The median age is 50.5, older than the national median. The population is 50.9% male and 49.1% female.
The median household income in Carbon County is $71,017, near the US median of $74,580. 4.9% of residents live below the federal poverty level. Home values sit at a median of $379,300, with monthly rent averaging $882. The homeownership rate of 74.1% is higher than the national rate of 64.8%.
Educational attainment in Carbon County reflects 30.3% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 10.8% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 28.9 minutes each way.
Carbon County Population History (2010-2024)
The county of Carbon County had a population of 10,063 in 2010 and 11,498 in 2024, a 14.3% growth over 14 years. The peak was 11,498 in 2024. Average annual growth rate: 0.97%.
11,498
Population (2024)
10,063
Population (2010)
11,498
Peak (2024)
0.97%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 10,063 |
| 2011 | 10,089 |
| 2012 | 10,142 |
| 2013 | 10,338 |
| 2014 | 10,438 |
| 2015 | 10,404 |
| 2016 | 10,480 |
| 2017 | 10,687 |
| 2018 | 10,654 |
| 2019 | 10,703 |
| 2020 | 10,514 |
| 2021 | 10,900 |
| 2022 | 11,241 |
| 2023 | 11,426 |
| 2024 | 11,498 |
Race & Ethnicity
| White | 93.0% |
| Black or African American | 0.5% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 2.7% |
| Two or More Races | 0.0% |
Age & Sex
50.5
Median Age
49.1%
Female
50.9%
Male
27.2%
Age 65+
Age Distribution
Children (under 15): 13.9% · Seniors (65+): 27.2%
Income & Poverty
| Median household income | $71,017+$1,095 vs state |
| Mean household income | $94,240 |
| Per-capita income | $42,734 |
| Poverty rate | 4.9%-2.2% vs state |
| Unemployment rate | 3.1% |
| Employment-to-population | 57.9% |
Top Industries by Employment
The largest employment sector in Carbon County is professional & business services, accounting for 18.2% of workers.
How residents commute
0.7%
Drive alone
6.1%
Carpool
66.2%
Public transit
10.8%
Work from home
28.9 min
Avg commute
Housing
$379,300+$41,200 vs state
Median home value
$882
Median rent
74.1%
Homeownership rate
6,431
Total housing units
73.3%
Occupied
26.7%
Vacant
25.9%
Renter-occupied
Social & access
92.5%
With health insurance
94.2%
With broadband internet
51.2%
Foreign-born
8.7%
Veterans (18+)
17.1%
With a disability
97.3%
Speak language other than English at home
Education
96.7%
High School+
30.3%
Bachelor's+
Largest cities in Montana
Other counties in Montana
Part of Montana
Metro areas in Montana
County rankings
Frequently Asked Questions
Carbon County, Montana has a population of 10,877 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 20th-largest county in Montana. Population density is 5 people per square mile.
The population of Carbon County has grown 14.3% since 2010 (10,063 → 11,498), a +0.96% annualized rate.
The median household income in Carbon County, Montana is $71,017, with mean (average) household income of $94,240 and per-capita income of $42,734. 4.9% of residents live below the federal poverty level.
In Carbon County, the largest racial and ethnic groups are White (93.0%), Hispanic or Latino (2.7%), 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 Carbon County, Montana is 50.5 years. Residents are 49.1% female and 50.9% male.
The median home value in Carbon County is $379,300 and median monthly rent is $882. 74.1% of occupied housing units are owner-occupied. The county has 6,431 total housing units, 26.7% of which are vacant.
The largest employment sector in Carbon County, Montana is professional, scientific, and management services, employing 18.2% of workers. The unemployment rate is 3.1%.
Billings is among the largest cities associated with Carbon County, Montana, with a population of 118,321.
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Statewide data for Montana
Population, race, income, age, and trends across Montana
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.