According to the U.S. Census Bureau, Aurora is currently the third largest city in Colorado ** and 52nd largest city in the country***. Growth Image Description: Aurora's population total for the following years (population in parentheses): 2010 (338,774), 2015 (351,200), 2019 (374,154), 2020 (381,057), 2021 (386,502), 2022 (398,018), 2023 ...