Rehoboth Beach is a city in Sussex County, Delaware, United States. According to the 2010 census, the population is 1,327, a decrease of 11.2% from 2000. It is part of the rapidly growing Delaware Beaches area and lies within the Seaford, Delaware Micropolitan Statistical Area.
A popular regional vacation destination, Rehoboth Beach's seasonal population expands to over 25,000 within the city limits and thousands more in the surrounding area in the summer.
In 2011, the NRDC awarded Rehoboth Beach with a 5-Star rating in water quality. This award was given only to 12 other locations, one being neighboring Dewey Beach. Out of the 30 states with coastline, the Delaware Beaches ranked number 1 in water quality in 2011.