Granite County, Montana Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 41st-largest in Montana
The population of Granite County, Montana is 3,419 as of the 2023 American Community Survey, making it the 41st-largest county in Montana. The median household income is $54,646, the median home value is $339,500, and the median age is 53.9.
The population of Granite County has grown 17.2% since 2010 (3,073 → 3,602), a +1.14% annualized rate.
3,419
Population
+1.14%
Annual growth
2
People / sq mi
$54,646
Median Income
$339,500
Median Home Value
Granite County covers 1,727 sq mi of land at 2.0 people per square mile.
About Granite County, MT
Granite County skews on age — the median resident is 53.9, older than the national median. With 3,419 residents, Granite County is a county in Montana. It ranks #41 among counties in Montana by population.
Incomes run on the lower side: a median household income of $54,646, below the US median of $78,538. Only 5.2% of residents live in poverty, below the national 12.4%. A typical home is worth $339,500, with typical rent around $734.
Educational attainment is on the higher side for US counties — 31.2% of adults hold a four-year degree, below the national 35.0%. Remote work is on the higher side at 10.8%, below the national 14.0%, and the average commute runs about 27 minutes each way.
The age structure shapes everything downstream in Granite County — from housing demand to the mix of working-age earners reflected in the income figures above.
Granite County Population History (2010-2024)
The county of Granite County had a population of 3,073 in 2010 and 3,602 in 2024, a 17.2% growth over 14 years. The peak was 3,602 in 2024. Average annual growth rate: 1.15%.
3,602
Population (2024)
3,073
Population (2010)
3,602
Peak (2024)
1.15%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 3,073 |
| 2011 | 3,077 |
| 2012 | 3,040 |
| 2013 | 3,067 |
| 2014 | 3,144 |
| 2015 | 3,160 |
| 2016 | 3,276 |
| 2017 | 3,343 |
| 2018 | 3,355 |
| 2019 | 3,335 |
| 2020 | 3,306 |
| 2021 | 3,354 |
| 2022 | 3,482 |
| 2023 | 3,565 |
| 2024 | 3,602 |
Race & Ethnicity
| White | 92.7% |
| Black or African American | 0.7% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 3.6% |
| Two or More Races | 0.0% |
Age & Sex
53.9
Median Age
48.9%
Female
51.1%
Male
30.8%
Age 65+
Age Distribution
Children (under 15): 12.5% · Seniors (65+): 30.8%
Income & Poverty
| Median household income | $54,646$-15,276 vs state |
| Mean household income | $80,224 |
| Per-capita income | $36,922 |
| Poverty rate | 5.2%-1.9% vs state |
| Unemployment rate | 3.2% |
| Employment-to-population | 46.4% |
Top Industries by Employment
The largest employment sector in Granite County is agriculture, accounting for 18.5% of workers.
How residents commute
0.0%
Drive alone
5.9%
Carpool
68.6%
Public transit
10.8%
Work from home
27.4 min
Avg commute
Housing
$339,500+$1,400 vs state
Median home value
$734
Median rent
76.4%
Homeownership rate
2,605
Total housing units
52.8%
Occupied
47.2%
Vacant
23.6%
Renter-occupied
Social & access
92.1%
With health insurance
90.5%
With broadband internet
48.5%
Foreign-born
11.1%
Veterans (18+)
17.4%
With a disability
98.7%
Speak language other than English at home
Education
93.0%
High School+
31.2%
Bachelor's+
Largest cities in Montana
Other counties in Montana
Part of Montana
Metro areas in Montana
County rankings
Frequently Asked Questions
Granite County, Montana has a population of 3,419 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 41st-largest county in Montana. Population density is 2 people per square mile.
The population of Granite County has grown 17.2% since 2010 (3,073 → 3,602), a +1.14% annualized rate.
The median household income in Granite County, Montana is $54,646, with mean (average) household income of $80,224 and per-capita income of $36,922. 5.2% of residents live below the federal poverty level.
In Granite County, the largest racial and ethnic groups are White (92.7%), Hispanic or Latino (3.6%), 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 Granite County, Montana is 53.9 years. Residents are 48.9% female and 51.1% male.
The median home value in Granite County is $339,500 and median monthly rent is $734. 76.4% of occupied housing units are owner-occupied. The county has 2,605 total housing units, 47.2% of which are vacant.
The largest employment sector in Granite County, Montana is agriculture, forestry, fishing, and mining, employing 18.5% of workers. The unemployment rate is 3.2%.
Billings is among the largest cities associated with Granite 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.