Florham Park, NJ has a population of 11,787 and is the 3,466th largest city in the United States. The population density is 1,613 per sq mi which is 161200% higher than the New Jersey average and 1680% higher than the national average. The median age in Florham Park is 39 which is approximately equal to the New Jersey average of 40. In Florham Park, 53% of the population over 15 years of age are married, 81% speak English and 6% speak Spanish. 57% of Florham Park residents were born in New Jersey, 26% were born out of state, 1% were born outside of the United States and 15% were foreign born.