Gallatin County, Montana Population 2026

Updated April 2026 · US Census ACS 2023 5-Year Estimates · 2nd-largest in Montana

The population of Gallatin County, Montana is 122,194 as of the 2023 American Community Survey, making it the 2nd-largest county in Montana. The median household income is $87,454, the median home value is $604,900, and the median age is 33.8.

The population of Gallatin County has grown 41.6% since 2010 (89,662 → 126,984), a +2.52% annualized rate.

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

122,194

Population

+2.52%

Annual growth

People / sq mi

$87,454

Median Income

$604,900

Median Home Value

Gallatin County covers 2,605 sq mi of land at 46.9 people per square mile.

About Gallatin County, MT

Housing cost is the defining feature of Gallatin County: the median home is valued at $604,900. Gallatin County is a county in Montana with a population of 122,194. It is the #2-largest of all counties in Montana nationally.

Earnings sit at the high end: a median household income of $87,454, above the US median of $78,538. Poverty is among the lowest of comparable US counties, at 4.1% — below the national 12.4%. Real estate commands a premium here — a median home value of $604,900, with typical rent around $1,574.

Gallatin County is among the best-educated US counties: 53.1% of adults 25 and older hold a bachelor’s degree, above the national 35.0%. Working from home is common here: 14.9% of workers do so, above the national 14.0%, and the average commute runs about 19 minutes each way.

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

Gallatin County Population History (2010-2024)

The county of Gallatin County had a population of 89,662 in 2010 and 126,984 in 2024, a 41.6% growth over 14 years. The peak was 126,984 in 2024. Average annual growth rate: 2.52%.

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

126,984

Population (2024)

89,662

Population (2010)

126,984

Peak (2024)

2.52%

Avg Annual Growth

Year	Population	Change	Annual %	Source
2010	89,662	-	-	estimate
2011	91,413	+1,751	+1.95%	estimate
2012	92,627	+1,214	+1.33%	estimate
2013	94,885	+2,258	+2.44%	estimate
2014	97,629	+2,744	+2.89%	estimate
2015	101,043	+3,414	+3.50%	estimate
2016	104,999	+3,956	+3.92%	estimate
2017	108,850	+3,851	+3.67%	estimate
2018	111,878	+3,028	+2.78%	estimate
2019	114,472	+2,594	+2.32%	estimate
2020	119,607	+5,135	+4.49%	estimate
2021	123,119	+3,512	+2.94%	estimate
2022	124,733	+1,614	+1.31%	estimate
2023	125,929	+1,196	+0.96%	estimate
2024	126,984	+1,055	+0.84%	estimate

Race & Ethnicity

White	89.7%
Black or African American	0.5%
Asian	0.1%
Hispanic or Latino (any race)	2.0%
Two or More Races	0.0%

Age & Sex

33.8

Median Age

47.7%

Female

52.3%

Male

13.3%

Age 65+

Age Distribution

Under 5

4.8%

5–9

5.3%

10–14

5.8%

15–19

7.3%

20–24

12.0%

25–34

16.4%

35–44

14.2%

45–54

10.7%

55–59

4.7%

60–64

5.5%

65–74

8.6%

75–84

3.5%

85+

1.2%

Children (under 15): 15.9% · Seniors (65+): 13.3%

Income & Poverty

Median household income	$87,454+$17,532 vs state
Mean household income	$124,551
Per-capita income	$51,148
Poverty rate	4.1%-3.0% vs state
Unemployment rate	1.7%
Employment-to-population	69.3%

Top Industries by Employment

Professional & business services

21.9%

Finance & real estate

13.1%

Construction

11.7%

Education & health care

11.5%

Manufacturing

6.2%

Information

5.6%

Arts, entertainment & food

5.2%

Agriculture

3.3%

The largest employment sector in Gallatin County is professional & business services, accounting for 21.9% of workers.

How residents commute

0.5%

Drive alone

5.4%

Carpool

68.1%

Public transit

14.9%

Work from home

18.8 min

Avg commute

Housing

$604,900+$266,800 vs state

Median home value

$1,574

Median rent

61.5%

Homeownership rate

55,589

Total housing units

90.0%

Occupied

10.0%

Vacant

38.5%

Renter-occupied

Social & access

92.7%

With health insurance

97.3%

With broadband internet

57.8%

Foreign-born

5.4%

Veterans (18+)

8.8%

With a disability

94.7%

Speak language other than English at home

Education

97.2%

High School+

53.1%

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)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)Park County (17,484)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

Gallatin County, Montana has a population of 122,194 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 2nd-largest county in Montana. Population density is 47 people per square mile.

The population of Gallatin County has grown 41.6% since 2010 (89,662 → 126,984), a +2.52% annualized rate.

The median household income in Gallatin County, Montana is $87,454, with mean (average) household income of $124,551 and per-capita income of $51,148. 4.1% of residents live below the federal poverty level.

In Gallatin County, the largest racial and ethnic groups are White (89.7%), Hispanic or Latino (2.0%), 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 Gallatin County, Montana is 33.8 years. Residents are 47.7% female and 52.3% male.

The median home value in Gallatin County is $604,900 and median monthly rent is $1,574. 61.5% of occupied housing units are owner-occupied. The county has 55,589 total housing units, 10.0% of which are vacant.

The largest employment sector in Gallatin County, Montana is professional, scientific, and management services, employing 21.9% of workers. The unemployment rate is 1.7%.

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