Berkeley is a village located in Cook County, Illinois, United States. Incorporated in 1924, the population at the 2020 census was 5,338. The town has a commuter railroad station on Metra's Union Pacific/…Berkeley is a village located in Cook County, Illinois, United States. Incorporated in 1924, the population at the 2020 census was 5,338. The town has a commuter railroad station on Metra's Union Pacific/West Line with service to downtown Chicago.