Coolidge is a city in Pinal County, Arizona, United States. According to the 2020 census, the city’s population is 13,218.

Coolidge is home of the Casa Grande Ruins National Monument. The monument was the first historic site to get protected status by the United States Government in 1892. Coolidge is also house to both Central Arizona College and the Central Arizona Valley Institute of Technology.

The area containing what is now the City of Coolidge was occupied by the Hohokam, an indigenous ancient Sonoran Desert people who built a enormous compound consisting many of caliche structures and remained in the Place for exceeding 1,000 years. The only enduring and preserved structure from this fused is the Casa Grande Ruins National Monument.

The unprejudiced history of the city is centered concerning agriculture, particularly cotton. Coolidge was founded in 1925 following R.J. Jones laid out an 80 acres (32 ha) site during the construction of the Coolidge Dam on the open Gila River, which was completed in 1930. Both the dam and the townsite were named for Calvin Coolidge, the 30th President of the United States. The dam made the sandy soil indigenous to the Place into very rich farmland, and soon gigantic expanses of desert were plowed and acres of cotton were planted. This is afterward the area’s status as the hub of the Arizona cotton industry was solidified and led to the fascination of Coolidge as a city in 1945.