
Sweet Grass County
- State:
- Montana
- County Seat:
- Big Timber
Sweet Grass County's estimated 2025 population is 3,835 with a growth rate of 0.95% in the past year according to the most recent United States census data. Sweet Grass County is the 39th largest county in Montana. The 2010 population was 3,617 and has seen a growth of 6.03% since that time.