Resident Population in Ottawa County, MI was 303.37200 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Ottawa County, MI reached a record high of 303.37200 in January of 2023 and a record low of 128.18100 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Ottawa County, MI - last updated from the United States Federal Reserve on May of 2024.