Eloy is a city in Pinal County, Arizona, United States, located 50 miles from Tucson. The city got its name from the Southern Pacific Railroad Eloy, which stands for East Line Of Yuma. This railway was created in 1880 and was the main route for the export of cotton. Thus, the city of Cotton City was founded in 1918, but in 1919 it was renamed to Eloy. The town was incorporated as part of Pinal County in 1949. As of the 2019 United States Census, Eloy had a population of 19,625.