Gallatin County's estimated 2026 population is 129,982 with a growth rate of 0.96% in the past year according to the most recent United States census data. Gallatin County is the 2nd largest county in Montana. The 2010 population was 89,662 and has seen a growth of 44.97% since that time.
Data after 2023 is projected based on recent change
Overall: 34.2 years
Female: 35.1 years
Male: 33.2 years
There are 100,769 adults, (16,865 of whom are seniors) in Gallatin County.
Female: 59,123 (47.7%)
Male: 64,951 (52.3%)
The racial composition of Gallatin County includes 88.8% White, and smaller percentages for other race, Asian, Native American, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 110,173 | 88.8% |
| Two or more races | 8,455 | 6.81% |
| Other race | 2,563 | 2.07% |
| Asian | 1,560 | 1.26% |
| Native American | 755 | 0.61% |
| Black or African American | 555 | 0.45% |
| Native Hawaiian or Pacific Islander | 13 | 0.01% |
Gallatin County's average per capita income is $57,338. Household income levels show a median of $93,528. The poverty rate stands at 9.52%.
Name | Median | Mean |
|---|---|---|
| Married Families | $128,619 | $177,537 |
| Families | $117,341 | $162,320 |
| Households | $93,528 | $132,508 |
| Non Families | $62,039 | $88,943 |
Average Income
Median Household Income
Poverty Rate
