Berkeley, IL has a population of 5,201 and is the 6,281st largest city in the United States. The population density is 3,714 per sq mi which is 1571% higher than the Illinois average and 3999% higher than the national average. The median age in Berkeley is 39 which is approximately 4% higher than the Illinois average of 37. In Berkeley, 49% of the population over 15 years of age are married, 67% speak English and 27% speak Spanish. 69% of Berkeley residents were born in Illinois, 14% were born out of state, 1% were born outside of the United States and 16% were foreign born.