Black Oak, AR has a population of 253 and is the 23,364th largest city in the United States. The population density is 605 per sq mi which is 991% higher than the Arkansas average and 568% higher than the national average. The median age in Black Oak is 30 which is approximately 22% lower than the Arkansas average of 38. In Black Oak, 63% of the population over 15 years of age are married, 86% speak English and 14% speak Spanish. 81% of Black Oak residents were born in Arkansas, 17% were born out of state, 0% were born outside of the United States and 2% were foreign born.