• county
  • FIPS 30031
  • Largest town: Bozeman

Gallatin County, Montana

Gallatin County had 126,984 residents in the Census Vintage 2024 estimate, on 2,605.4 square miles of land. It ranks 2nd of 56 in Montana by population and 24th by land area.

Population
126,984
#2 of 56 in Montana · #515 in US
Area
2,605.4 sq mi
#24 of 56 in Montana · #204 in US
Density
49 / sq mi
#3 of 56 in Montana · #1,494 in US
Median household income
$90,942
#1 of 56 in Montana · #234 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Gallatin County within Montana. Pin: Helena.

Measure from here

Tools and pages that start from Gallatin County

Gallatin County population, land area and income

Gallatin County had 126,984 residents in the Census Vintage 2024 estimate, on 2,605.4 square miles of land. It ranks 2nd of 56 in Montana by population and 24th by land area. That works out to 48.7 people per square mile, below the US average of 96.3, and above the national county median.

The median county-equivalent in Montana has 7,814 residents, so Gallatin County is 16.3 times that size.

Its SAIPE 2023 median household income of $90,942 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

126,984

3144th1st

515th of 3,144 (US)

Land area

2,605 sq mi

3144th1st

204th of 3,144 (US)

Density

48.7 / sq mi

3144th1st

1494th of 3,144 (US)

Median household income

$90,942

3143rd1st

234th of 3,143 (US)

Rank within Montana (56)

Population

126,984

56th1st

2nd of 56 (MT)

Land area

2,605 sq mi

56th1st

24th of 56 (MT)

Density

48.7 / sq mi

56th1st

3rd of 56 (MT)

Median household income

$90,942

56th1st

1st of 56 (MT)

How Gallatin County's population changed since 2020

Gallatin County gained 7,377 residents between the July 2020 and July 2024 estimates, a rise of 6.2%. That ranks 15th of 56 in Montana for growth. The median Montana county changed by +2.8%, and the state as a whole by +4.6%.

Since the April 2020 estimates base, Gallatin County recorded 4,950 births and 2,863 deaths, a natural change of +2,087. Net international migration added +600 and net domestic migration, people moving to or from other US counties, came to +5,398. The largest single component was domestic migration, which added 5,398 people.

119.6k2020123.1k2021124.7k2022125.9k2023127.0k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
4,950
Deaths
2,863
Net international migration
+600
Net domestic migration
+5,398
Change, July 2023 to July 2024
+1,055

Where Gallatin County is

The Census internal point of Gallatin County is at 45.518100, -111.163900. It sits in UTM zone 12N. The map shades Montana's 56 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Gallatin County outlined. Dots are towns of 1,000+ people with residents in it.

Liberty County: -1.2%Golden Valley County: +5.1%Dawson County: -2.1%Flathead County: +9.2%Beaverhead County: +6.7%Prairie County: +2.0%Garfield County: +0.9%Lewis and Clark County: +5.5%Sweet Grass County: +2.4%Wheatland County: -0.7%Ravalli County: +8.5%Jefferson County: +9.6%Carter County: -0.6%Chouteau County: -0.6%Custer County: +0.9%Teton County: +3.1%Granite County: +9.0%Deer Lodge County: +4.1%Cascade County: +0.1%Powder River County: +2.4%Meagher County: +7.3%Daniels County: -1.7%Glacier County: -1.8%Wibaux County: -2.7%Fallon County: -2.7%McCone County: -0.7%Sheridan County: -2.5%Missoula County: +3.5%Toole County: +3.7%Sanders County: +11.5%Roosevelt County: -5.6%Rosebud County: -1.3%Treasure County: -2.5%Yellowstone County: +3.9%Blaine County: -1.4%Musselshell County: +14.8%Broadwater County: +21.0%Powell County: +2.6%Fergus County: +3.4%Phillips County: +0.1%Gallatin County: +6.2%Silver Bow County: +2.6%Madison County: +12.6%Richland County: -4.4%Lake County: +6.9%Valley County: -1.7%Judith Basin County: +4.3%Hill County: -1.2%Big Horn County: -2.2%Stillwater County: +5.0%Carbon County: +9.4%Mineral County: +13.7%Petroleum County: +4.6%Pondera County: +3.4%Park County: +4.9%Lincoln County: +12.4%
Change 2020 to 2024
  1. < -1.4%
  2. < +0.9%
  3. < +3.9%
  4. < +7.3%
  5. ≥ +7.3%
no data

Orange pin: Gallatin County internal point. Dark pin: Helena.

Internal point

Decimal
45.518100, -111.163900
DMS
45°31'5.16"N 111°09'50.04"W
UTM
12N 487199.1E 5040520.4N
Geohash
c80fyqkfj
Plus code
85QCGR9P+6C

Towns in Gallatin County

5 incorporated places of 1,000+ people have residents in Gallatin County, 75,850 people together, or 60% of the county. Each figure counts only the part of the town inside Gallatin County; towns marked "part" extend into another county. The largest is Bozeman with 57,894.

  1. 01Bozeman57,894
  2. 02Belgrade12,741
  3. 03Manhattan2,068
  4. 04Three Forks1,945
  5. 05West Yellowstone1,202
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Gallatin County

The Census 2024 county adjacency file lists 8 neighbors for Gallatin County, including 3 across a state line. The most populous is Park County, WY, with 31,082 residents. Distances run between Census internal points in a straight line.

Distance to Helena and the nearest big city

Helena is 84.4 miles NNW of Gallatin County's internal point in a straight line. The nearest place of 100,000 or more is Billings, MT (population 121,483), 127.5 miles away. The nearest place of 10,000 or more is Bozeman, MT (population 57,894), 12.6 miles away.

Gallatin County FIPS code

The FIPS code of Gallatin County is 30031: state code 30 for Montana plus county code 031. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $90,942.

Questions people ask

What is the population of Gallatin County, Montana?

The Census Vintage 2024 estimate for July 1, 2024 is 126,984. That is up 7,377 people (6.2%) from the July 2020 estimate of 119,607.

What is the FIPS code of Gallatin County?

30031. The first two digits (30) are Montana; the last three (031) identify the county.

What is the largest town in Gallatin County?

Bozeman, with 57,894 residents inside Gallatin County in 2024.

Which counties border Gallatin County?

8 county-equivalents border it in the Census 2024 adjacency file: Park County, WY; Teton County, WY; Park County, MT; Fremont County, ID; Jefferson County, MT; Madison County, MT; Broadwater County, MT; Meagher County, MT.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.