Charlotte, North Carolina is 40 times larger than Cambridge, Massachusetts.
Area: 19 km2 calculated
Cambridge is a city in Middlesex County, Massachusetts, United States, in the Boston metropolitan area, situated directly north of the city of Boston proper, across the Charles River. Wikipedia
Area: 733 km2 calculated
Charlotte is the largest city in the U.S. state of North Carolina and the seat of Mecklenburg County. In 2013, the estimated population of Charlotte according to the U.S. Census Bureau was 792,862, making it the 16th largest city in the United States based on population. Wikipedia