Peak, SC has a population of 45 and is the 28,280th largest city in the United States. The population density is 116 per sq mi which is 22% lower than the South Carolina average and 28% higher than the national average. The median age in Peak is 57 which is approximately 46% higher than the South Carolina average of 39. In Peak, 54% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 91% of Peak residents were born in South Carolina, 9% were born out of state, 0% were born outside of the United States and 0% were foreign born.