Harrisburg, AR has a population of 2,419 and is the 10,018th largest city in the United States. The population density is 1,028 per sq mi which is 1753% higher than the Arkansas average and 1034% higher than the national average. The median age in Harrisburg is 37 which is approximately 3% lower than the Arkansas average of 38. In Harrisburg, 62% of the population over 15 years of age are married, 98% speak English and 2% speak Spanish. 76% of Harrisburg residents were born in Arkansas, 21% were born out of state, 0% were born outside of the United States and 2% were foreign born.