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 for water quality in 2011.
Many centuries ago, sea levels were lower, and the Atlantic Coast lay about 30 miles (48 km) farther east than it does today. At the time, the area would have resembled inland portions of southern Delaware today. By the time the first Europeans arrived in the area in the 17th century, the coastline was at its present location and several Native American Indian tribes lived in the area, including the Lenape (or Delaware), the Sikkonese, the Assateagues, and the Nanticoke. The site was the location of what may have been the most important Native American fishing village on the Middle Atlantic coast (the evidence has been obliterated by development).