Thank you for visiting the Cook County Historic Archives and Records Office (CARO). We are committed to providing access to rich historical archival materials that explains the role of the growth and development of Cook County. We are currently closed to the public. We are slated to open for patron visits in the future. We welcome inquiries and offer remote reference services to which inquiries can be directed to

Follow the Cook County Historic Archives and Records Office on Twitter @CookCoArchives and on Instagram @CookCountyArchives.


We look forward to hearing from you soon!

Cook County Historic Archives and Records Office (CARO) continues its 190th Anniversary theme "Essential to You, Equity for All" in March for Women's History Month

Follow CARO on Twitter @cookcoarchives and on Instagram @cookcountyarchives to stay up to date with the Cook County Historic Archives and Records Office during the month of February to learn more about historic figures and leaders in Cook County Government past and present, and join us as we celebrate Women archivists, archives, collections and the broader archives-adjacent community.

Here's a sampling of our recent activity...

January 7, 2021

John H. Stroger Jr Hospital formerly known as Cook County Hospital was opened in 1857. since the very beginning it has always been a teaching hospital. @CookCtyHealth

January 1, 2021

Happy New Year! Let’s take COUNTY SEATS for $400, Alex... @Jeopardy @cookcountygov @CookCountyBoard @ToniPreckwinkle

According to a fan database, Cook County, in some form, is the “question” to at least 32 @Jeopardy  clues over the last 34 seasons of the show


December 31, 2020

New Year’s Flashback to 1999. @cookcountygov staff from several depts including @cookcountytech rang in the #NewYears doing #Y2K troubleshooting. Remain calm, all is well! #HappyNewYear2021