Buchanan, NY has a population of 2,246 and is the 10,391st largest city in the United States. The population density is 1,641 per sq mi which is 358% higher than the New York average and 1712% higher than the national average. The median age in Buchanan is 44 which is approximately 16% higher than the New York average of 38. In Buchanan, 66% of the population over 15 years of age are married, 79% speak English and 14% speak Spanish. 77% of Buchanan residents were born in New York, 8% were born out of state, 0% were born outside of the United States and 15% were foreign born.