Diaz, AR has a population of 1,407 and is the 13,071st largest city in the United States. The population density is 239 per sq mi which is 330% higher than the Arkansas average and 163% higher than the national average. The median age in Diaz is 41 which is approximately 9% higher than the Arkansas average of 38. In Diaz, 53% of the population over 15 years of age are married, 98% speak English and 2% speak Spanish. 81% of Diaz residents were born in Arkansas, 18% were born out of state, 0% were born outside of the United States and 1% were foreign born.