Resident Population in Summit County, OH was 535.73300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Summit County, OH reached a record high of 553.37100 in January of 1970 and a record low of 507.99200 in January of 1986. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Summit County, OH - last updated from the United States Federal Reserve on May of 2024.