Resident Population in Middlesex County, VA was 10.92400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Middlesex County, VA reached a record high of 10.98100 in January of 2010 and a record low of 6.20000 in January of 1971. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Middlesex County, VA - last updated from the United States Federal Reserve on May of 2024.