Newton, IL has a population of 2,631 and is the 9,520th largest city in the United States. The population density is 1,258 per sq mi which is 466% higher than the Illinois average and 1289% higher than the national average. The median age in Newton is 48 which is approximately 27% higher than the Illinois average of 37. In Newton, 52% of the population over 15 years of age are married, 98% speak English and 2% speak Spanish. 86% of Newton residents were born in Illinois, 13% were born out of state, 0% were born outside of the United States and 1% were foreign born.