Harrison, NJ has a population of 15,007 and is the 2,832nd largest city in the United States. The population density is 12,391 per sq mi which is 1238960% higher than the New Jersey average and 13576% higher than the national average. The median age in Harrison is 35 which is approximately 13% lower than the New Jersey average of 40. In Harrison, 52% of the population over 15 years of age are married, 26% speak English and 41% speak Spanish. 34% of Harrison residents were born in New Jersey, 10% were born out of state, 4% were born outside of the United States and 52% were foreign born.