El Dorado is a city in Union County, Arkansas, located on the southern border of the state and serving as the county seat. According to the 2020 census, the city has a population of 17,755 and has an African American majority population.
As the county seat of Union County, El Dorado serves as an administrative and commercial center for the region. The city's location in southern Arkansas positions it as part of the state's lower portion near the Louisiana border.