Resident Population in Harrison County, OH was 14.04200 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Harrison County, OH reached a record high of 18.15200 in January of 1980 and a record low of 14.04200 in January of 2024. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Harrison County, OH - last updated from the United States Federal Reserve on April of 2026.