Resident Population in Putnam County, OH was 34.19900 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Putnam County, OH reached a record high of 34.79900 in January of 1998 and a record low of 31.13400 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Putnam County, OH - last updated from the United States Federal Reserve on May of 2024.