Erie, IL has a population of 1,545 and is the 12,504th largest city in the United States. The population density is 1,071 per sq mi which is 382% higher than the Illinois average and 1082% higher than the national average. The median age in Erie is 40 which is approximately 7% higher than the Illinois average of 37. In Erie, 65% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 68% of Erie residents were born in Illinois, 29% were born out of state, 0% were born outside of the United States and 3% were foreign born.