Eldorado, Illinois
Eldorado is a city in Saline County, Illinois, United States. The population was 4,122 at the 2010 census, with a 1980 peak of 5,198. Although the city's name is spelled as if it were Spanish, the name was originally "Elderedo" or “Elder-Redo”—a combination of the last names of the town's two founders, Judge Samuel Elder, his son William, grandson Francis Marion, and neighbor Joseph Reed, and his brother William. According to legend, a signpainter... Show more for the railroad painted the name "Eldorado" on the train depot; as a result, the spelling and pronunciation was forever changed.Eldorado is included in the Illinois–Indiana–Kentucky tri-state area and is a bedroom community in the Harrisburg micropolitan statistical area.