1500Education
A new high school with a 1500-student capacity was completed in June 2011.
1829Government
== History ==
=== Timeline ===
1829, the territorial legislature took sections of Hempstead and Clark counties to establish Union County.
1843Government
1843, Matthew Rainey founded and named El Dorado.
1845History
1845, First Baptist Church was organized.
1870Government
1870, El Dorado Baptist Church was founded and El Dorado was incorporated.
1883History
1883, Albert Williams was lynched in El Dorado
1891, the first passenger train arrives in El Dorado from Camden.
1902History
1902, the Tucker-Parnell Feud erupts between Guy Tucker (city marshal), and a local businessman (Tom Parnell).
1908Education
1908, Washington High School opens.
1919Crime
1919, Frank Livingston, a black World War I veteran accused of murder with scant evidence, was burned alive by a mob near El Dorado.
1922Government
El Dorado is sometimes referred to as "Arkansas' Original Boomtown."
1922, El Dorado Oil Refinery was commissioned and the B'nai B'rith lodge was founded.
1927Architecture
1927, the Lion Oil-Exchange Building was completed.
1928Architecture
=== Attractions ===
The Union County Courthouse, opened in 1928.
1929Architecture
The Rialto Theater, listed on the National Register of Historic Places, opened in 1929 with seating for 1,400, and presented live stage shows and films.
1936History
Daniels, 1936–1992, founder of Country Music Television
Candice Earley, actress
Michael G.
1956Government
It has featured musical acts, entertainment shows, school productions, dance recitals and was formerly the location of the South Arkansas Symphony Orchestra, which was founded i...
1964Education
== Notable people ==
Beryl Anthony Jr., member of the United States House of Representatives
Michael Aiken, Chancellor of the University of Illinois Urbana-Champaign
Donna Axum,...
1965Architecture
The South Arkansas Arboretum, opened in 1965, is Arkansas's only state park located within a city.
2010History
=== 2010 census ===
As of the census of 2010, there were 18,884 people, 8,969 households, and 5,732 families residing in the city.
2011Architecture
The El Dorado Conference Center is a 50,764-square-foot (4,716.1 m2) multi-purpose facility opened in 2011, which features an assembly hall
main hall, small meeting rooms, the s...
2017Architecture
== Arts and culture ==
=== Venues ===
The Murphy Arts District (MAD) opened in 2017 in downtown El Dorado.
2020History
== Demographics ==
=== 2020 census ===
As of the 2020 United States census, there were 17,756 people, 7,164 households, and 4,466 families residing in the city.