Darlington, SC has a population of 6,185 and is the 5,643rd largest city in the United States. The population density is 1,360 per sq mi which is 822% higher than the South Carolina average and 1401% higher than the national average. The median age in Darlington is 42 which is approximately 9% higher than the South Carolina average of 39. In Darlington, 48% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 76% of Darlington residents were born in South Carolina, 23% were born out of state, 0% were born outside of the United States and 1% were foreign born.