Resident Population in Frederick County, VA was 98.10900 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Frederick County, VA reached a record high of 98.10900 in January of 2024 and a record low of 24.10700 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Frederick County, VA - last updated from the United States Federal Reserve on April of 2026.