Rio Rico, AZ has a population of 18,589 and is the 2,349th largest city in the United States. The population density is 299 per sq mi which is 419% higher than the Arizona average and 230% higher than the national average. The median age in Rio Rico is 33 which is approximately 12% lower than the Arizona average of 37. In Rio Rico, 59% of the population over 15 years of age are married, 18% speak English and 81% speak Spanish. 49% of Rio Rico residents were born in Arizona, 15% were born out of state, 3% were born outside of the United States and 32% were foreign born.