Passaic, NJ has a population of 70,536 and is the 518th largest city in the United States. The population density is 22,514 per sq mi which is 2251330% higher than the New Jersey average and 24750% higher than the national average. The median age in Passaic is 29 which is approximately 27% lower than the New Jersey average of 40. In Passaic, 42% of the population over 15 years of age are married, 26% speak English and 68% speak Spanish. 44% of Passaic residents were born in New Jersey, 11% were born out of state, 6% were born outside of the United States and 39% were foreign born.