Where is Sussex County?

3 Sussex Counties in 3 states · 435,958 people (2025)

There are 3 counties named Sussex County in the United States, in Delaware, New Jersey and Virginia. The most populous is Sussex County, Delaware (county seat: Georgetown), with 277,140 people in 2025. 3 of them are named after Sussex, historic county of England, United Kingdom.

Map of the United States showing where all 3 Sussex Counties are, labeled by state
Every Sussex County in the United States (red), labeled with its state. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).

All 3 Sussex Counties

Sorted by state. Each link opens the county's map.

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Sussex County, DelawareGeorgetown277,1409361683Sussex
Sussex County, New JerseyNewton148,0635191753Sussex
Sussex County, VirginiaSussex10,7554901754Sussex

Questions about Sussex Counties

How many Sussex Counties are there?

There are 3 Sussex Counties in the United States, in Delaware, New Jersey and Virginia.

Which Sussex County is the largest?

By population, Sussex County, Delaware (277,140 people in 2025). By land area, Sussex County, Delaware (936 sq mi).

Which Sussex County is the oldest?

Sussex County, Delaware, established in 1683. The newest is Sussex County, Virginia (1754).

Why are there so many Sussex Counties?

3 of the 3 are named after Sussex, historic county of England, United Kingdom. Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Sussex County an address is in?

Open the county map of the state: it has a search box for cities, towns and ZIP codes. On a phone, the "what county am I in" tool on our sister site uses your location.

What county am I in? →

Other common county names