The Ultimate Guide To Denver, CO Real Estate & Homes for Sale - Realtor.com Inc. 1885. Location city, 155 square miles (401 square km). Pop. (2010) 600,158; Denver-Aurora-Broomfield City Area, 2,543,482; (2020) 715,522; Denver-Aurora-Lakewood City Location, 2,963,821. History The website worked as an