Delaware Counties Directory & Interactive Map
Complete official guide to all 3 counties in Delaware (DE). Explore 2024 US Census population estimates, county seats, FIPS codes, land areas, and interactive mapping tools powered by GeoMap Suite.
Delaware County Breakdown
Showing 3 of 3 documented counties and seats.
Geographic Structure of Delaware Counties
County Administration & Governance
In Delaware, county governments manage vital public infrastructure, tax assessments, law enforcement, judicial courts, election administration, and public records. The county seat (Wilmington and other municipal headquarters) houses the primary courthouse, commissioners, and sheriff’s department.
All Delaware counties carry a unique 5-digit Federal Information Processing Standard (FIPS) code, where the first two digits (10) designate the state and the remaining three digits identify each specific jurisdiction.
Geographic & Demographic Highlights
- Most Populous County:New Castle County (570,719 residents)
- Largest by Land Area:Sussex County (938 sq mi)
- State Capital:Dover
- Census Bureau Region:South United States
Demographic calculations derive from the United States Census Bureau 2024 Population Estimates Program (PEP) and TIGER/Line geographic boundary files.