Where is Chester County?

3 Chester Counties in 3 states · 608,111 people (2025)

There are 3 counties named Chester County in the United States, in Pennsylvania, South Carolina and Tennessee. The most populous is Chester County, Pennsylvania (county seat: West Chester), with 557,116 people in 2025.

Map of the United States showing where all 3 Chester Counties are, labeled by state
Every Chester 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 Chester Counties

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Chester County, PennsylvaniaWest Chester557,1167511682Chester
Chester County, South CarolinaChester33,0015811785–
Chester County, TennesseeHenderson17,9942861882Robert I. Chester

Questions about Chester Counties

How many Chester Counties are there?

There are 3 Chester Counties in the United States, in Pennsylvania, South Carolina and Tennessee.

Which Chester County is the largest?

By population, Chester County, Pennsylvania (557,116 people in 2025). By land area, Chester County, Pennsylvania (751 sq mi).

Which Chester County is the oldest?

Chester County, Pennsylvania, established in 1682. The newest is Chester County, Tennessee (1882).

How do I find out which Chester 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.

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Other common county names