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Denver CO · Denver County 729,019 residents Colorado Springs CO · El Paso County 493,554 residents Aurora CO · Arapahoe County 403,130 residents Fort Collins CO · Larimer County 170,924 residents Lakewood CO · Jefferson County 156,868 residents Thornton CO · Adams County 146,689 residents Arvada CO · Jefferson County 121,873 residents Westminster CO · Adams County 115,302 residents Greeley CO · Weld County 114,363 residents Pueblo CO · Pueblo County 111,166 residents Centennial CO · Arapahoe County 108,853 residents Boulder CO · Boulder County 106,803 residents Longmont CO · Boulder County 99,818 residents Castle Rock CO · Douglas County 83,213 residents Loveland CO · Larimer County 81,102 residents Broomfield CO · Broomfield County 78,323 residents Grand Junction CO · Mesa County 70,554 residents Commerce City CO · Adams County 70,245 residents Parker CO · Douglas County 65,473 residents Littleton CO · Arapahoe County 44,879 residents Brighton CO · Adams County 43,473 residents Windsor CO · Weld County 41,734 residents Erie CO · Weld County 38,594 residents Northglenn CO · Adams County 38,287 residents