Union County, Arkansas

Union County
County
Union County Courthouse in El Dorado
Location within the U.S. state of Arkansas
Arkansas's location within the U.S.
Coordinates: 33°11′14″N 92°35′29″W / 33.187222222222°N 92.591388888889°W / 33.187222222222; -92.591388888889
Country	United States
State	Arkansas
Founded	November 2, 1829
Seat	El Dorado
Largest city	El Dorado
Area
• Total	1,055 sq mi (2,730 km2)
• Land	1,039 sq mi (2,690 km2)
• Water	16 sq mi (40 km2)  1.5%
Population  (2020)
• Total	39,054
• Density	40/sq mi (20/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	4th
Website	www.unioncountyar.com

Union County is a county located on the central southern border of the U.S. state of Arkansas. As of the 2020 census, the population was 39,054.^[1] The county seat is El Dorado. The county was formed on November 2, 1829, and named in recognition of the citizens' petition for a new county, which said that they were petitioning "in the spirit of Union and Unity." The county is directly adjacent to the south to Union Parish in the state of Louisiana.

The El Dorado, AR Micropolitan Statistical Area includes all of Union County.

Called by boosters the "Queen City of South Arkansas", El Dorado was at the heart of the 1920s oil boom in South Arkansas. More recently, the city has been called "Arkansas's Original Boomtown," as it emphasizes its historic assets for heritage tourism.^[2] The chemical and timber industries became important during and after World War II, and still have a place in the economy.