Newton, NJ has a population of 7,982 and is the 4,690th largest city in the United States. The population density is 2,376 per sq mi which is 237452% higher than the New Jersey average and 2522% higher than the national average. The median age in Newton is 41 which is approximately 4% higher than the New Jersey average of 40. In Newton, 48% of the population over 15 years of age are married, 86% speak English and 10% speak Spanish. 67% of Newton residents were born in New Jersey, 18% were born out of state, 1% were born outside of the United States and 15% were foreign born.