Somerton, AZ has a population of 14,866 and is the 2,858th largest city in the United States. The population density is 2,004 per sq mi which is 3386% higher than the Arizona average and 2112% higher than the national average. The median age in Somerton is 28 which is approximately 25% lower than the Arizona average of 37. In Somerton, 60% of the population over 15 years of age are married, 9% speak English and 90% speak Spanish. 45% of Somerton residents were born in Arizona, 11% were born out of state, 2% were born outside of the United States and 42% were foreign born.