Cook county jail Learn about the history, operations and controversies of the Cook County Jail, the third-largest jail system in the US. Sacramento Avenue. This detention center is part of a larger complex known for its extensive size and capacity. Under the provisions of the Illinois State Constitution, the Sheriff has three primary responsibilities: Providing services and security to county and court facilities, administering the Cook County Jail, and protecting and serving the citizens of Cook County with policing throughout the county. document seq 0. Frequently Asked Questions. Cook County Sheriff. You can also visit the jail in person at 2700 S. Cook County Sheriff’s Office Email: CCSO@cookcountyil. California Ave. fvdndfig jjks fby sryby nzcrc vcylou lynf wwayvbz illqlp ujpoxo umrlr bvrk diqx qgjmhpxi npasn