Harlem-O'Hare Blue Line View Schedule on CTA Website View Full System Map Harlem-O'Hare - Average Ridership by Type of Day for September JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember Chart JSON If this is blank, your library will need to implement code in your JavaScript. Please see the README.md. Related Jurisdictions Council of Mayors Chicago Chicago Ward Ward 41 Anthony Napolitano County Cook Illinois House District 20 Brad Stephens Illinois Senate District 10 Robert Martwick Municipality Chicago US Congressional District 5 Mike Quigley