Within Illinois, nearly all lines either presently have or previously had commuter service in and out of Chicago. Commuter service was eventually discontinued on some lines, while surviving commuter service is now operated by Metra. A few lines serving Indiana also previously had commuter service, now all discontinued. And a few commuter lines previously extended into Wisconsin, with all service in Wisconsin eventually discontinued except to Kenosha.
Known stations are marked, while some station locations in the Chicago area are estimated.