Gallatin County, MT Demographics
Gallatin County, MT is the 2nd most populous of 56 counties in Montana, with 118,960 residents across 2,605 square miles. That is about 46 people per square mile.
At the 2020 census
| Population | 118,960 |
|---|---|
| Land area | 2,605 sq mi |
| Density | 46 / sq mi |
Data: 2020 Census · American Community Survey 2024
How Gallatin County compares to the US
We're computing this county's comparison table — check back shortly. Population, land area, and density above are already exact.
Central Location: Gallatin County, MT
Measured from the county's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around Gallatin County, MT — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Census tracts in Gallatin County, MT
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| Census Tract 5.02 | 8,247 | 40.6 | 203 |
| Census Tract 5.05 | 6,750 | 2.9 | 2,331 |
| Census Tract 5.06 | 6,713 | 2.0 | 3,365 |
| Census Tract 1.01 | 6,362 | 32.6 | 195 |
| Census Tract 2.01 | 6,119 | 5.7 | 1,068 |
| Census Tract 2.02 | 5,898 | 18.0 | 327 |
| Census Tract 4 | 5,866 | 179.4 | 33 |
| Census Tract 11.01 | 5,535 | 0.7 | 8,096 |
| Census Tract 10.02 | 5,113 | 3.8 | 1,358 |
| Census Tract 11.02 | 5,049 | 7.8 | 645 |
| Census Tract 12 | 4,972 | 243.1 | 20 |
| Census Tract 1.05 | 4,925 | 1.2 | 3,982 |
| Census Tract 5.07 | 4,551 | 4.5 | 1,011 |
| Census Tract 17 | 4,343 | 820.8 | 5 |
| Census Tract 7.04 | 4,338 | 0.8 | 5,696 |
| Census Tract 9 | 4,176 | 0.6 | 6,737 |
| Census Tract 1.04 | 4,057 | 1.3 | 3,089 |
| Census Tract 10.01 | 3,608 | 1.8 | 1,960 |
| Census Tract 3 | 3,583 | 289.3 | 12 |
| Census Tract 7.01 | 3,399 | 1.0 | 3,399 |
| Census Tract 16 | 3,396 | 427.9 | 8 |
| Census Tract 6 | 2,860 | 2.3 | 1,222 |
| Census Tract 5.04 | 2,690 | 20.5 | 131 |
| Census Tract 8 | 2,328 | 0.4 | 5,394 |
| Census Tract 7.03 | 2,126 | 0.5 | 4,010 |
| Census Tract 15 | 1,956 | 495.8 | 4 |
Related places
Other counties nearby
Nearest counties
Metro areas containing Gallatin County
About this page
This page shows demographics for a US county from the 2020 census and the American Community Survey: population, land area, density, urban share, and how the county compares to national averages for income, housing, age, and more.
Counties subdivide into census tracts, listed below with their populations. The drive-time and radius tables measure the population around the county's main population center.