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 …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 receive protected status by the United States Government in 1892. Coolidge is also home to both Central Arizona College and the Central Arizona Valley Institute of Technology.
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