Rehoboth Beach is a city 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.