Casa Grande (O'odham: Wainom Wo:g) is a city in Pinal County, approximately halfway between Phoenix and Tucson, in the U.S. state of Arizona. According to the 2020 census, the population of the city was 55,653. It is named after the Casa Grande Ruins National Monument which is actually located in Coolidge. Casa Grande is Spanish for "big house". Among resident English speakers, there is no consensus on how to pronounce the city's name.