Southside, AR has a population of 2,519 and is the 9,797th largest city in the United States. The population density is 257 per sq mi which is 363% higher than the Arkansas average and 183% higher than the national average. The median age in Southside is 33 which is approximately 12% lower than the Arkansas average of 38. In Southside, 53% of the population over 15 years of age are married, 98% speak English and 2% speak Spanish. 77% of Southside residents were born in Arkansas, 22% were born out of state, 0% were born outside of the United States and 1% were foreign born.