Coolidge, AZ has a population of 12,073 and is the 3,403rd largest city in the United States. The population density is 166 per sq mi which is 156% higher than the Arizona average and 83% higher than the national average. The median age in Coolidge is 34 which is approximately 8% lower than the Arizona average of 37. In Coolidge, 50% of the population over 15 years of age are married, 73% speak English and 25% speak Spanish. 63% of Coolidge residents were born in Arizona, 31% were born out of state, 1% were born outside of the United States and 5% were foreign born.