Waldo, AR has a population of 1,411 and is the 13,057th largest city in the United States. The population density is 605 per sq mi which is 990% higher than the Arkansas average and 567% higher than the national average. The median age in Waldo is 30 which is approximately 20% lower than the Arkansas average of 38. In Waldo, 55% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 74% of Waldo residents were born in Arkansas, 26% were born out of state, 0% were born outside of the United States and 0% were foreign born.