Union County, Pennsylvania

Union County
Old Union County Courthouse in New Berlin
Old Union County Courthouse in New Berlin
Map of Pennsylvania highlighting Union County
Location within the U.S. state of Pennsylvania
Map of the United States highlighting Pennsylvania
Pennsylvania's location within the U.S.
Coordinates: 40°58′N 77°04′W / 40.96°N 77.06°W / 40.96; -77.06
Country United States
State Pennsylvania
FoundedMarch 22, 1813
SeatLewisburg
Largest boroughLewisburg
Area
 • Total318 sq mi (820 km2)
 • Land316 sq mi (820 km2)
 • Water1.8 sq mi (5 km2)  0.6%
Population
 (2020)
 • Total42,681 Decrease
 • Density142/sq mi (55/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional district15th
Websiteunionco.org

Union County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 42,681.[1] Its county seat is Lewisburg.[2] The county was created on March 22, 1813, from part of Northumberland County. Its name is an allusion to the federal Union. Mifflinburg was established by legislation as the first county seat until it was moved to New Berlin in 1815. Lewisburg became county seat in 1855 and has remained so since. Union County comprises the Lewisburg, PA Micropolitan Statistical Area, which is also included in the Bloomsburg-Berwick-Sunbury, PA Combined Statistical Area. The county is part of the Central Pennsylvania region of the state.[a]

  1. ^ "Census - Geography Profile: Union County, Pennsylvania". United States Census Bureau. Retrieved December 18, 2022.
  2. ^ "Find a County". National Association of Counties. Retrieved June 7, 2011.


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