Ellendale is a town in Sussex County, Delaware, United States. The population was 487 at the 2020 census, an increase of 27.8% since the 2010 census, and a 48.9% increase since the year 2000. It is part of the Salisbury, Maryland-Delaware Metropolitan Statistical Area. Ellendale is the "Gateway to Delaware's Resort Beaches" because it is the town located on U.S. Route 113, the resort area's westernmost border, and Delaware Route 16, the resort area's northernmost border with the eastern border being the Delaware Bay and Atlantic Ocean and the southern border being the state line with Maryland.

U.S. Route 113 (US 113) is a U.S. Highway that is a spur of US 13 in the U.S. states of Maryland and Delaware. The route runs 74.75 miles (120.30 km) from US 13 in Pocomoke City, Maryland, north to Delaware Route 1 (DE 1) in Milford, Delaware. In conjunction with DE 1, US 113 is one of two major north–south highways on the Delmarva Peninsula that connect Dover with Pocomoke City and the Eastern Shore of Virginia. The U.S. Highway is the primary north–south highway in Worcester County, Maryland, where it connects Pocomoke City with Snow Hill and Berlin. US 113 is one of three major north–south highways in Sussex County, Delaware, where it connects Selbyville, Millsboro, and Georgetown with Milford. While US 113 does not pass through Ocean City or the Delaware Beaches, the U.S. Highway intersects several highways that serve the Atlantic seaboard resorts, including US 50, Maryland Route 90 (MD 90), US 9, DE 404, DE 16, and DE 1. US 113 is a four-lane divided highway for its whole length.