Arivaca, AZ has a population of 607 and is the 18,368th largest city in the United States. The population density is 22 per sq mi which is 62% lower than the Arizona average and 76% lower than the national average. The median age in Arivaca is 64 which is approximately 74% higher than the Arizona average of 37. In Arivaca, 58% of the population over 15 years of age are married, 87% speak English and 13% speak Spanish. 22% of Arivaca residents were born in Arizona, 73% were born out of state, 1% were born outside of the United States and 3% were foreign born.