Rockford is probably a little farther than what SIU typically considers central/southern IL. Having said that, if you're willing to spend a little extra money, it never hurts to apply.
We do have a few out of state students who went through the MEDPREP program. I believe they were allowed to use their new Carbondale address as their state of residence for the application. Basically, MEDPREP is an excellent post-bac/grad program to help students (both in and out of state) improve their chances of being accepted into med school. I don't know a whole lot about the program so I'll try to minimize misinformation by referring you to these links.
http://www.siumed.edu/medprep/home.html
http://forums.studentdoctor.net/threads/siu-medprep-2017.1210160/
http://forums.studentdoctor.net/threads/siu-medprep-2016.1159331/
If you have questions about MEDPREP program post them in the MEDPREP forum or you can DM me and I'll ask one of my friends who did the program.
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