Bakersfield, California is 2.2 times larger than Rockford, Illinois.
Area: 362 km2 calculated
Bakersfield is a city near the southern end of the San Joaquin Valley in Kern County, California. It is roughly equidistant between Fresno and Los Angeles, which are 110 mi to the north and south, respectively. Wikipedia
Area: 166 km2 calculated
Rockford is the third largest city in the U.S. state of Illinois, the 160th most populous city in the United States, and the 112th most populous region in the United States. It is the county seat of Winnebago County and is located on both banks of the Rock River in far northern Illinois. Wikipedia