Cresskill, NJ has a population of 8,745 and is the 4,359th largest city in the United States. The population density is 4,248 per sq mi which is 424668% higher than the New Jersey average and 4588% higher than the national average. The median age in Cresskill is 43 which is approximately 9% higher than the New Jersey average of 40. In Cresskill, 71% of the population over 15 years of age are married, 61% speak English and 7% speak Spanish. 35% of Cresskill residents were born in New Jersey, 31% were born out of state, 2% were born outside of the United States and 32% were foreign born.