St. Stephen, SC has a population of 1,763 and is the 11,770th largest city in the United States. The population density is 727 per sq mi which is 393% higher than the South Carolina average and 703% higher than the national average. The median age in St. Stephen is 36 which is approximately 8% lower than the South Carolina average of 39. In St. Stephen, 55% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 77% of St. Stephen residents were born in South Carolina, 23% were born out of state, 0% were born outside of the United States and 0% were foreign born.