Richland County Flag

Richland County

State:
Montana
County Seat:
Sidney

Richland County's estimated 2026 population is 11,683 with a growth rate of 2.69% in the past year according to the most recent United States census data. Richland County is the 19th largest county in Montana. The 2010 population was 9,760 and has seen a growth of 19.7% since that time.

11,683
Total Population
6
Population Density (mi²)
19
Population Rank (State)
306 2.69%
Annual Population Growth

Richland County Population

Demographics

Economics and Income Statistics