Prairie Grove, AR has a population of 4,997 and is the 6,481st largest city in the United States. The population density is 538 per sq mi which is 870% higher than the Arkansas average and 494% higher than the national average. The median age in Prairie Grove is 35 which is approximately 6% lower than the Arkansas average of 38. In Prairie Grove, 67% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 61% of Prairie Grove residents were born in Arkansas, 37% were born out of state, 1% were born outside of the United States and 1% were foreign born.