Denver County, CO - Resident Population in Denver County/city, CO was 716.57700 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Denver County, CO - Resident Population in Denver County/city, CO reached a record high of 725.50800 in January of 2019 and a record low of 468.13900 in January of 1990. Trading Economics provides the current actual value, an historical data chart and related indicators for Denver County, CO - Resident Population in Denver County/city, CO - last updated from the United States Federal Reserve on May of 2024.