Netcong, NJ has a population of 3,248 and is the 8,408th largest city in the United States. The population density is 3,901 per sq mi which is 389960% higher than the New Jersey average and 4205% higher than the national average. The median age in Netcong is 40 which is approximately 1% higher than the New Jersey average of 40. In Netcong, 41% of the population over 15 years of age are married, 75% speak English and 15% speak Spanish. 71% of Netcong residents were born in New Jersey, 12% were born out of state, 1% were born outside of the United States and 16% were foreign born.