
Custer County
- State:
- Montana
- County Seat:
- Miles City
Custer County's estimated 2025 population is 11,955 with a growth rate of -0.13% in the past year according to the most recent United States census data. Custer County is the 18th largest county in Montana. The 2010 population was 11,691 and has seen a growth of 2.26% since that time.