Jacksonville, Florida is 6,658 times larger than Mobile, Alabama.
Area: 0 km2 calculated
Mobile is the county seat of Mobile County, Alabama. The population within the city limits was 195,111 as of the 2010 United States Census, making it the third most populous city in the U.S. Wikipedia
Area: 1,988 km2 calculated
Jacksonville is the largest city in the U.S. state of Florida by population and the largest city by area in the contiguous United States. It is the county seat of Duval County, with which the city government consolidated in 1968. Wikipedia