Getting started with the auto dealers license in Delaware. The city of Dover is the capital and second largest city in the U.S. state of Delaware. It is also the county seat of Kent County and the main town of Dover, Delaware Metropolitan Statistical Area, which includes all of Kent County. It is located on St. Jones River in the coastal plain of the Delaware River. He was appointed by William Penn for Dover in Kent, England. In 2010 the city had a population of 36,047.