Old Brookville, NY has a population of 2,154 and is the 10,578th largest city in the United States. The population density is 539 per sq mi which is 50% higher than the New York average and 495% higher than the national average. The median age in Old Brookville is 41 which is approximately 6% higher than the New York average of 38. In Old Brookville, 67% of the population over 15 years of age are married, 76% speak English and 4% speak Spanish. 75% of Old Brookville residents were born in New York, 7% were born out of state, 1% were born outside of the United States and 16% were foreign born.