Freeburg, IL has a population of 4,111 and is the 7,327th largest city in the United States. The population density is 609 per sq mi which is 174% higher than the Illinois average and 572% higher than the national average. The median age in Freeburg is 45 which is approximately 19% higher than the Illinois average of 37. In Freeburg, 65% of the population over 15 years of age are married, 96% speak English and 2% speak Spanish. 77% of Freeburg residents were born in Illinois, 21% were born out of state, 1% were born outside of the United States and 1% were foreign born.