Oswego, SC has a population of 27 and is the 28,658th largest city in the United States. The population density is 22 per sq mi which is 85% lower than the South Carolina average and 75% lower than the national average. The median age in Oswego is 0 which is approximately 100% lower than the South Carolina average of 39. In Oswego, 100% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 100% of Oswego residents were born in South Carolina, 0% were born out of state, 0% were born outside of the United States and 0% were foreign born.