Aurora, Colorado is 2.7 times larger than Hartford, Connecticut.
Area: 125 km2 calculated
The City of Aurora is a Home Rule Municipality in the State of Colorado, spanning Arapahoe and Adams counties, with the extreme southeastern portion of the city extending into Douglas County. Aurora is one of the principal cities of the Denver-Aurora-Broomfield, CO Metropolitan Statistical Area. Wikipedia
Area: 47 km2 calculated
Hartford is the capital of the U.S. state of Connecticut and the historic seat of Hartford County until Connecticut disbanded county government in 1960. Wikipedia