Gilbert, AZ has a population of 226,832 and is the 98th largest city in the United States. The population density is 3,335 per sq mi which is 5701% higher than the Arizona average and 3581% higher than the national average. The median age in Gilbert is 33 which is approximately 10% lower than the Arizona average of 37. In Gilbert, 60% of the population over 15 years of age are married, 86% speak English and 6% speak Spanish. 39% of Gilbert residents were born in Arizona, 51% were born out of state, 1% were born outside of the United States and 9% were foreign born.