Manassas Park City, VA - Resident Population in Manassas Park city, VA was 16.36100 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Manassas Park City, VA - Resident Population in Manassas Park city, VA reached a record high of 18.07100 in January of 2019 and a record low of 6.02800 in January of 1981. Trading Economics provides the current actual value, an historical data chart and related indicators for Manassas Park City, VA - Resident Population in Manassas Park city, VA - last updated from the United States Federal Reserve on May of 2024.