Bellmore, NY has a population of 15,722 and is the 2,728th largest city in the United States. The population density is 6,666 per sq mi which is 1758% higher than the New York average and 7258% higher than the national average. The median age in Bellmore is 43 which is approximately 13% higher than the New York average of 38. In Bellmore, 69% of the population over 15 years of age are married, 89% speak English and 3% speak Spanish. 86% of Bellmore residents were born in New York, 4% were born out of state, 0% were born outside of the United States and 9% were foreign born.