Duanesburg, NY has a population of 360 and is the 21,445th largest city in the United States. The population density is 147 per sq mi which is 59% lower than the New York average and 62% higher than the national average. The median age in Duanesburg is 41 which is approximately 7% higher than the New York average of 38. In Duanesburg, 70% of the population over 15 years of age are married, 84% speak English and 6% speak Spanish. 84% of Duanesburg residents were born in New York, 4% were born out of state, 12% were born outside of the United States and 0% were foreign born.