Check the NWS office pages. Some list repeaters, some don't.
Here's what Chicago listens to. Quad Cities used to have a list of their repeaters on their page but it seems to have been removed. St. Louis
has a good informative page as well. And of course these aren't comprehensive lists, there are other nets to listen to as well. Around Chicago Lake County is on 147.180 (127.3), McHenry County on 146.835 (91.5), Kane County on 145.470 (103.5), DuPage County is on one of the Wheaton repeaters but I can't recall which one, and the northern part of Will County has the Bolingbrook repeater on 147.330 (107.2) (linked to 443.525 114.8).