Charlotte, North Carolina is 5.7 times larger than Boston.
Area: 129 km2 calculated
Boston is the capital and largest city of the Commonwealth of Massachusetts in the United States. Boston also serves as county seat of Suffolk County. 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