South Glens Falls, NY has a population of 3,591 and is the 7,930th largest city in the United States. The population density is 2,644 per sq mi which is 637% higher than the New York average and 2818% higher than the national average. The median age in South Glens Falls is 41 which is approximately 8% higher than the New York average of 38. In South Glens Falls, 47% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 87% of South Glens Falls residents were born in New York, 12% were born out of state, 0% were born outside of the United States and 1% were foreign born.