Wanamassa, NJ has a population of 4,591 and is the 6,849th largest city in the United States. The population density is 4,122 per sq mi which is 412060% higher than the New Jersey average and 4449% higher than the national average. The median age in Wanamassa is 38 which is approximately 3% lower than the New Jersey average of 40. In Wanamassa, 62% of the population over 15 years of age are married, 88% speak English and 5% speak Spanish. 72% of Wanamassa residents were born in New Jersey, 18% were born out of state, 1% were born outside of the United States and 9% were foreign born.