Mercer County, West Virginia

Mercer County
The Mercer County Courthouse in Princeton in 2007
Location within the U.S. state of West Virginia
West Virginia's location within the U.S.
Coordinates: 37°25′N 81°07′W / 37.41°N 81.11°W / 37.41; -81.11
Country United States
State West Virginia
FoundedMarch 17, 1837
SeatPrinceton
Largest townBluefield
Area
  Total
421 sq mi (1,090 km2)
  Land419 sq mi (1,090 km2)
  Water1.7 sq mi (4 km2)  0.4%
Population
 (2020)
  Total
59,664
  Estimate 
(2021)
59,097
  Density140/sq mi (55/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional district1st
Websitewww.mercercounty.wv.gov

Mercer County is a county in Southern West Virginia on the southeastern border of the U.S. state of West Virginia. At the 2020 census, the population was 59,664. Its county seat is Princeton. The county was originally established in the State of Virginia by act of its General Assembly on March 17, 1837, using lands taken from Giles and Tazewell counties.

Mercer County is part of the Bluefield, WV-VA Micropolitan Statistical Area.