Gainesville, Florida is 2.5 times larger than Manhattan (NYC borough).
Area: 145 km2 calculated
Gainesville is the county seat and largest city in Alachua County, Florida, and the principal city of the Gainesville, Florida Metropolitan Statistical Area. The population of Gainesville in the 2010 United States Census was 124,354. Wikipedia
Area: 59 km2 calculated
Manhattan is the most densely populated of the five boroughs of New York City. The borough is coterminous with New York County, an original county of the U.S. state of New York. Wikipedia