Willcox, AZ has a population of 3,617 and is the 7,894th largest city in the United States. The population density is 588 per sq mi which is 923% higher than the Arizona average and 549% higher than the national average. The median age in Willcox is 34 which is approximately 8% lower than the Arizona average of 37. In Willcox, 53% of the population over 15 years of age are married, 56% speak English and 43% speak Spanish. 55% of Willcox residents were born in Arizona, 25% were born out of state, 6% were born outside of the United States and 13% were foreign born.