Bound Brook, NJ has a population of 10,512 and is the 3,797th largest city in the United States. The population density is 6,328 per sq mi which is 421% higher than the New Jersey average and 6884% higher than the national average. The median age in Bound Brook is 34 which is approximately 13% lower than the New Jersey average of 40. In Bound Brook, 44% of the population over 15 years of age are married, 51% speak English and 44% speak Spanish. 51% of Bound Brook residents were born in New Jersey, 17% were born out of state, 2% were born outside of the United States and 30% were foreign born.