East Alton, IL has a population of 6,171 and is the 5,652nd largest city in the United States. The population density is 1,158 per sq mi which is 421% higher than the Illinois average and 1178% higher than the national average. The median age in East Alton is 43 which is approximately 14% higher than the Illinois average of 37. In East Alton, 54% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 71% of East Alton residents were born in Illinois, 25% were born out of state, 1% were born outside of the United States and 2% were foreign born.