New Berlin, IL has a population of 1,505 and is the 12,661st largest city in the United States. The population density is 1,315 per sq mi which is 491% higher than the Illinois average and 1351% higher than the national average. The median age in New Berlin is 36 which is approximately 5% lower than the Illinois average of 37. In New Berlin, 64% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 83% of New Berlin residents were born in Illinois, 16% were born out of state, 0% were born outside of the United States and 1% were foreign born.