Sussex County, Delaware

Sussex County, Delaware: key facts

Sussex County, Delaware has its county seat in Georgetown (county history) and is governed by a five-member elected County Council (county). The Census Bureau counted 237,378 residents in the 2020 Census and estimated 277,140 for July 1, 2025 (QuickFacts). The county's Cities and Towns page lists 25 municipalities.

Facts, each with its source

FactValueSource
County seatGeorgetownSource
Sussex County history page, 1791 entry: Georgetown "platted out and established as the new County seat"
Land area (2020)936.16 square milesSource
Census QuickFacts, land area in square miles, 2020
Total area as stated by the county938 square milesSource
Sussex County, About Sussex County: "spanning 938 square miles"
Population, 2020 Census237,378Source
Census QuickFacts, April 1, 2020 census
Population estimate, July 1, 2025 (estimate)277,140Source
Census QuickFacts, estimate V2025
Municipalities listed by the county25Source
Sussex County Cities and Towns page lists 25 names; the page does not state a total
Form of governmentCounty Council, five membersSource
Sussex County: "governed by a five-member elected Council"; each member is elected from one of five districts to a four-year term
Council members5Source
County Council page lists five members, one per council district
Year named1681 to 1682Source
Sussex County history timeline, 1681-1682: William Penn "names Delaware's southernmost county for his home county of Sussex in England."

Left out because no source consulted states them: the number of ZIP codes and any founding year on sussexcountyde.gov. The county's own pages do not give a county population. The 2025 figure is a Census Bureau estimate, not a count. Official county site: sussexcountyde.gov.