Lancaster, SC has a population of 8,971 and is the 4,277th largest city in the United States. The population density is 1,393 per sq mi which is 705% higher than the South Carolina average and 1438% higher than the national average. The median age in Lancaster is 40 which is approximately 4% higher than the South Carolina average of 39. In Lancaster, 41% of the population over 15 years of age are married, 93% speak English and 6% speak Spanish. 74% of Lancaster residents were born in South Carolina, 22% were born out of state, 1% were born outside of the United States and 3% were foreign born.