Brighton, IL has a population of 2,316 and is the 10,225th largest city in the United States. The population density is 1,237 per sq mi which is 456% higher than the Illinois average and 1265% higher than the national average. The median age in Brighton is 38 which is approximately 1% higher than the Illinois average of 37. In Brighton, 60% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 80% of Brighton residents were born in Illinois, 20% were born out of state, 0% were born outside of the United States and 0% were foreign born.