Burnham, IL has a population of 4,212 and is the 7,207th largest city in the United States. The population density is 2,271 per sq mi which is 921% higher than the Illinois average and 2406% higher than the national average. The median age in Burnham is 34 which is approximately 9% lower than the Illinois average of 37. In Burnham, 32% of the population over 15 years of age are married, 78% speak English and 20% speak Spanish. 75% of Burnham residents were born in Illinois, 13% were born out of state, 1% were born outside of the United States and 11% were foreign born.