Resident Population in Grant County, KY was 25.72200 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Grant County, KY reached a record high of 25.72200 in January of 2024 and a record low of 9.99900 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Grant County, KY - last updated from the United States Federal Reserve on April of 2026.