Bradley, IL has a population of 15,668 and is the 2,737th largest city in the United States. The population density is 2,268 per sq mi which is 895% higher than the Illinois average and 2403% higher than the national average. The median age in Bradley is 34 which is approximately 9% lower than the Illinois average of 37. In Bradley, 57% of the population over 15 years of age are married, 90% speak English and 7% speak Spanish. 81% of Bradley residents were born in Illinois, 13% were born out of state, 1% were born outside of the United States and 5% were foreign born.