
Ottawa County
- State:
- Michigan
- County Seat:
- Grand Haven
Ottawa County's estimated 2025 population is 308,280 with a growth rate of 0.8% in the past year according to the most recent United States census data. Ottawa County is the 7th largest county in Michigan. The 2010 population was 264,114 and has seen a growth of 16.72% since that time.