Hackensack, NJ has a population of 44,271 and is the 922nd largest city in the United States. The population density is 10,563 per sq mi which is 1056160% higher than the New Jersey average and 11558% higher than the national average. The median age in Hackensack is 39 which is approximately 2% lower than the New Jersey average of 40. In Hackensack, 46% of the population over 15 years of age are married, 53% speak English and 32% speak Spanish. 37% of Hackensack residents were born in New Jersey, 21% were born out of state, 3% were born outside of the United States and 40% were foreign born.