Market insights · Montana
Gallatin County, MT: growth, migration and housing
Gallatin County has 128,740 residents, up 7.7% since 2020 (+1.0% in the last year). In 2022–2023, 5,356 households moved in and 5,009 moved out (+347 net), bringing in a net $58.8M of income. Median household income is $93,528, the median home $667,600 and median rent $1,694 a month.
In Montana: 14th of 56 counties for 5-year population growth · 20th of 46 counties for net in-migration (per resident) · 2nd of 56 counties for median household income · 1st of 56 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Gallatin County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Yellowstone County, MT | 217 | $13.6M |
| Park County, MT | 155 | $11.5M |
| Missoula County, MT | 139 | $7.9M |
| Lewis and Clark County, MT | 120 | $5.9M |
| King County, WA | 120 | $15.3M |
| Flathead County, MT | 100 | $6.3M |
| Cascade County, MT | 77 | $4.0M |
| Los Angeles County, CA | 66 | $6.9M |
Where leavers went
Top counties by households leaving Gallatin County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Yellowstone County, MT | 239 | $14.6M |
| Park County, MT | 184 | $37.9M |
| Missoula County, MT | 167 | $8.4M |
| Flathead County, MT | 137 | $8.2M |
| Lewis and Clark County, MT | 134 | $7.5M |
| King County, WA | 117 | $9.0M |
| Broadwater County, MT | 107 | $10.0M |
| Cascade County, MT | 100 | $5.3M |
BizyFi in Gallatin County
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Sources: U.S. Census Bureau population estimates (vintage 2025), American Community Survey 5-year (2024), and IRS Statistics of Income county-to-county migration data (2022–2023). Migration counts are tax returns (roughly households) moving between U.S. counties; the IRS suppresses very small flows. Growth rates, per-1,000 figures, rent share and state ranks are BizyFi calculations. Data updated 2026-10-17. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.