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.
Granite County, MT Climate
Granite County, MT has an average annual temperature of 3.8°C (39°F) and receives about 397 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
3.8°C
Avg Temp
397
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -6° / 20° | 24 mm |
| February | -4° / 25° | 18 mm |
| March | -1° / 29° | 26 mm |
| April | 3° / 37° | 34 mm |
| May | 7° / 45° | 59 mm |
| June | 12° / 53° | 55 mm |
| July | 15° / 59° | 33 mm |
| August | 15° / 59° | 38 mm |
| September | 10° / 50° | 36 mm |
| October | 5° / 40° | 27 mm |
| November | -2° / 28° | 24 mm |
| December | -6° / 21° | 23 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 Granite County, MT
The most comfortable months to visit Granite County, MT 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 January (near -12°C low). May is usually the wettest month.
Where to stay near Granite County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.