
Mountrail County
- State:
- North Dakota
Mountrail County's estimated 2025 population is 9,667 with a growth rate of 1.49% in the past year according to the most recent United States census data. Mountrail County is the 16th largest county in North Dakota. The 2010 population was 7,708 and has seen a growth of 25.42% since that time.