Gardnertown, NY has a population of 5,004 and is the 6,470th largest city in the United States. The population density is 1,037 per sq mi which is 189% higher than the New York average and 1045% higher than the national average. The median age in Gardnertown is 37 which is approximately 3% lower than the New York average of 38. In Gardnertown, 52% of the population over 15 years of age are married, 76% speak English and 17% speak Spanish. 79% of Gardnertown residents were born in New York, 7% were born out of state, 2% were born outside of the United States and 12% were foreign born.