Rehoboth Beach is a city on the Atlantic Ocean along the Delaware Beaches in eastern Sussex County, Delaware, United States. As of the 2010 United States Census, the population was 1,327, reflecting a decline of 161 (11.2%) from the 1,488 counted in the 2000 Census. Along with the neighboring coastal city of Lewes, Rehoboth Beach is one of the principal cities of Delaware's rapidly growing Cape Region. Rehoboth Beach lies within the Salisbury, Maryland-Delaware Metropolitan 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 one in water quality in 2011.