USCCA has a free ap that lets you enter your CCL info and tells you what states you are covered in.
(e) Nothing in this Act shall prohibit a non-resident from transporting a concealed firearm within his or her vehicle in Illinois, if the concealed firearm remains within his or her vehicle and the non-resident: (1) is not prohibited from owning or possessing a firearm under federal law; (2) is eligible to carry a firearm in public under the laws of his or her state or territory of residence; and (3) is not in possession of a license under this Act. If the non-resident leaves his or her vehicle unattended, he or she shall store the firearm within a locked vehicle or locked container within the vehicle in accordance with subsection (b) of Section 65 of this Act.