BT's Detroit Road Guide: Covers regional freeways.
East Central States Road Guide: Many for Ohio.
Exit Numbers on Wisconsin's Freeways: Official Department of Transportation page.
Freeway Junctions of the Heartland: Some interstates and US freeways in Iowa and northwestern Illinois.
Freeways of the Deep South - Louisiana: Most interstates.
Houston Freeway Guide: Most freeways in Houston, Texas.
I-535/US-53 Exit Guide: In Minnesota and Wisconsin.
Lone Star Roads Exit Listings: Covers Texas Interstates.
Miami Valley Freeways: Covers the area around Dayton, Ohio.
Missouri Freeway Exit Lists: Includes data for completed highways as well as conjecture for proposed and fantasy alignments.
Ohio Interstate Exit Guide: Official Department of Transportation page. Contains a collection of .pdf files for each Interstate which list exit numbers, intersecting highways, and nearby businesses.
Southeast Texas Highways - Exit Guides: Includes all freeways.
Spaghetti Junction: Chicago Skyway/Indiana Toll Road and Indiana State Road 912.
The Cape Rock | Roads and Highways: I-55 and I-57 exit lists for Missouri, and all of I-155.
Twin Cities Freeway Exit Lists: All freeways in the Minneapolis/St Paul, Minnesota area.
Western Reserve Exit Guide Page: Covers Northeast Ohio.