Cook County Jails

Cook County Jails is at 2700 South California Avenue, Chicago, IL 60608 (Cook County, Illinois).

You can reach Cook County Jails on (773) 674-7100. If the line has changed, the agency's website will have the current number.

Use the agency's official inmate lookup, linked on this page, or call the facility on (773) 674-7100. Official agency records are the final authority on custody status.

The official website is linked on this page. Use it for general questions; urgent matters are best handled by phone.

Cook County Jails is a county jail run by the county sheriff's office. County jails hold people awaiting trial and those serving short sentences, usually under a year.

Its sources list a capacity of 10,000 places. Actual occupancy changes from day to day.

Most facilities ask visitors to book ahead and to show photo ID on arrival. Cook County Jails's own visiting times and dress rules are the ones that count, so check with the facility on (773) 674-7100 first.

Address the envelope with the person's full name and booking or inmate number, followed by Cook County Jails, 2700 South California Avenue, Chicago, IL 60608. Many facilities only accept plain letters and photos, so check its mail rules before sending anything else.