Douglas, AZ has a population of 16,764 and is the 2,551st largest city in the United States. The population density is 1,678 per sq mi which is 2819% higher than the Arizona average and 1752% higher than the national average. The median age in Douglas is 33 which is approximately 10% lower than the Arizona average of 37. In Douglas, 33% of the population over 15 years of age are married, 35% speak English and 62% speak Spanish. 51% of Douglas residents were born in Arizona, 24% were born out of state, 1% were born outside of the United States and 24% were foreign born.