Winnsboro, SC has a population of 3,376 and is the 8,226th largest city in the United States. The population density is 1,046 per sq mi which is 609% higher than the South Carolina average and 1054% higher than the national average. The median age in Winnsboro is 36 which is approximately 8% lower than the South Carolina average of 39. In Winnsboro, 44% of the population over 15 years of age are married, 95% speak English and 4% speak Spanish. 83% of Winnsboro residents were born in South Carolina, 13% were born out of state, 1% were born outside of the United States and 3% were foreign born.