Buffalo, NY has a population of 258,989 and is the 77th largest city in the United States. The population density is 6,413 per sq mi which is 1688% higher than the New York average and 6979% higher than the national average. The median age in Buffalo is 33 which is approximately 14% lower than the New York average of 38. In Buffalo, 36% of the population over 15 years of age are married, 83% speak English and 8% speak Spanish. 74% of Buffalo residents were born in New York, 13% were born out of state, 4% were born outside of the United States and 9% were foreign born.