You should take Maryland out of the “May Issue” category on that map. It is very, very difficult to get a CCW permit in Maryland; I am reliably told that only one or two are granted every year.
It's still may issue. The CLEO just exercises his choice not to do so.
In Wisconsin and Illinois, there's no maybe about it -- there is no such thing as lawful carry; the exception being for the Chicago aldermen who have a convenient state law granting them special dispensation.
There's an even more detailed map available from gunmap.org, including printer-ready PDFs.