Stillwater County, Montana Population 2026

Updated April 2026 · US Census ACS 2023 5-Year Estimates · 24th-largest in Montana

The population of Stillwater County, Montana is 9,052 as of the 2023 American Community Survey, making it the 24th-largest county in Montana. The median household income is $81,503, the median home value is $355,600, and the median age is 47.4.

The population of Stillwater County has grown 3.7% since 2010 (9,112 → 9,450), a +0.26% annualized rate.

Stillwater County within Montana · Source: US Census TIGER/Line via us-atlas

9,052

Population

+0.26%

Annual growth

People / sq mi

$81,503

Median Income

$355,600

Median Home Value

Stillwater County covers 1,797 sq mi of land at 5.0 people per square mile.

About Stillwater County, MT

Housing cost is the defining feature of Stillwater County: the median home is valued at $355,600. With 9,052 residents, Stillwater County is a county in Montana. It ranks #24 among counties in Montana by population.

Households take in a median $81,503, comfortably near the US median of $78,538. Poverty is relatively low for US counties at 6.0%, below the national 12.4%. Home values run above average at $355,600, with typical rent around $968.

About 29.8% of adults 25 and older have a bachelor’s degree, below the 35.0% national figure. About 7.9% of the workforce is home-based, below the national 14.0%, and the average commute runs about 29 minutes each way.

High housing values reframe the income picture in Stillwater County — even solid earnings stretch less against home prices and rents at this level.

Stillwater County Population History (2010-2024)

The county of Stillwater County had a population of 9,112 in 2010 and 9,450 in 2024, a 3.7% growth over 14 years. The peak was 9,671 in 2019. Average annual growth rate: 0.29%.

Stillwater County population, 2010–2024 · Source: U.S. Census Bureau — decennial census & Population Estimates

9,450

Population (2024)

9,112

Population (2010)

9,671

Peak (2019)

0.29%

Avg Annual Growth

Year	Population	Change	Annual %	Source
2010	9,112	-	-	estimate
2011	9,153	+41	+0.45%	estimate
2012	9,161	+8	+0.09%	estimate
2013	9,250	+89	+0.97%	estimate
2014	9,230	-20	-0.22%	estimate
2015	9,419	+189	+2.05%	estimate
2016	9,349	-70	-0.74%	estimate
2017	9,408	+59	+0.63%	estimate
2018	9,496	+88	+0.94%	estimate
2019	9,671	+175	+1.84%	estimate
2020	9,002	-669	-6.92%	estimate
2021	9,026	+24	+0.27%	estimate
2022	9,194	+168	+1.86%	estimate
2023	9,237	+43	+0.47%	estimate
2024	9,450	+213	+2.31%	estimate

Race & Ethnicity

White	93.3%
Black or African American	0.1%
Asian	0.0%
Hispanic or Latino (any race)	3.2%
Two or More Races	0.0%

Age & Sex

47.4

Median Age

49.8%

Female

50.2%

Male

25.0%

Age 65+

Age Distribution

Under 5

4.2%

5–9

6.2%

10–14

5.9%

15–19

6.6%

20–24

4.3%

25–34

9.1%

35–44

10.9%

45–54

12.2%

55–59

7.6%

60–64

8.1%

65–74

16.2%

75–84

6.7%

85+

2.1%

Children (under 15): 16.3% · Seniors (65+): 25.0%

Income & Poverty

Median household income	$81,503+$11,581 vs state
Mean household income	$111,489
Per-capita income	$48,923
Poverty rate	6.0%-1.1% vs state
Unemployment rate	2.1%
Employment-to-population	59.6%

Top Industries by Employment

Agriculture

20.5%

Professional & business services

19.1%

Construction

8.7%

Education & health care

8.6%

Finance & real estate

8.2%

Manufacturing

6.8%

Information

6.3%

Retail trade

5.4%

The largest employment sector in Stillwater County is agriculture, accounting for 20.5% of workers.

How residents commute

3.3%

Drive alone

4.1%

Carpool

61.9%

Public transit

7.9%

Work from home

28.5 min

Avg commute

Housing

$355,600+$17,500 vs state

Median home value

$968

Median rent

80.8%

Homeownership rate

4,657

Total housing units

83.1%

Occupied

16.9%

Vacant

19.2%

Renter-occupied

Social & access

95.4%

With health insurance

92.9%

With broadband internet

46.7%

Foreign-born

11.6%

Veterans (18+)

17.2%

With a disability

98.8%

Speak language other than English at home

Education

93.1%

High School+

29.8%

Bachelor's+

Largest cities in Montana

Billings (118,321)Missoula (75,600)Great Falls (60,412)Bozeman (55,042)Butte-Silver Bow (34,929)Helena (33,126)Kalispell (26,830)Belgrade (11,425)All Montana cities →

Other counties in Montana

Yellowstone County (167,340)Gallatin County (122,194)Missoula County (119,639)Flathead County (108,445)Cascade County (84,601)Lewis and Clark County (72,580)Ravalli County (45,807)Silver Bow County (35,589)Lake County (32,073)Lincoln County (20,656)All Montana counties →

Part of Montana

Montana demographic profile All Montana data →

Metro areas in Montana

Billings (187,269)Missoula (124,435)Bozeman (122,194)Helena (92,391)Great Falls (84,601)All US metros →

County rankings

US Counties by Population Richest US Counties by Median Household Income Expensive US Counties by Home Value Educated US Counties Counties With Highest Poverty Rates Youngest US Counties by Median Age Oldest US Counties by Median Age Cheapest US Counties by Median Home Value Racially Diverse US Counties Counties With Largest Hispanic Population All rankings →

Frequently Asked Questions

Stillwater County, Montana has a population of 9,052 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 24th-largest county in Montana. Population density is 5 people per square mile.

The population of Stillwater County has grown 3.7% since 2010 (9,112 → 9,450), a +0.26% annualized rate.

The median household income in Stillwater County, Montana is $81,503, with mean (average) household income of $111,489 and per-capita income of $48,923. 6.0% of residents live below the federal poverty level.

In Stillwater County, the largest racial and ethnic groups are White (93.3%), Hispanic or Latino (3.2%), 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 Stillwater County, Montana is 47.4 years. Residents are 49.8% female and 50.2% male.

The median home value in Stillwater County is $355,600 and median monthly rent is $968. 80.8% of occupied housing units are owner-occupied. The county has 4,657 total housing units, 16.9% of which are vacant.

The largest employment sector in Stillwater County, Montana is agriculture, forestry, fishing, and mining, employing 20.5% of workers. The unemployment rate is 2.1%.

Billings is among the largest cities associated with Stillwater County, Montana, with a population of 118,321.