Resident Population in Hamilton County, OH was 827.05800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Hamilton County, OH reached a record high of 925.94400 in January of 1970 and a record low of 800.74600 in January of 2011. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Hamilton County, OH - last updated from the United States Federal Reserve on May of 2024.