County Boundary Signs In Illinois
I-255 North - Saint Clair County
Entering Saint Clair County on I-255 North.
Taken 03-29-2026
Columbia
St. Clair County
Illinois
United States
IL-3 North - Jackson County/Big Muddy River
Entering Jackson County on IL-3 North. At the Big Muddy River bridge.
Taken 03-29-2026
Grand Tower
Jackson County
Illinois
United States
IL-3 North/IL-146 East - Union County
Entering Union County on IL-3 North/IL-146 East.
Taken 03-29-2026
McClure
Union County
Illinois
United States