# Illinois Route 15

Illinois Route 15 (IL 15) is a 149.64-mile-long (240.82 km) east–west highway in southern Illinois with its western terminus at Illinois Route 3, U.S. Route 40, I-55, and I-64, and its eastern terminus at Wabash River at the Illinois/Indiana Border where it meets State Road 64.

## History

West of Mt. Vernon, IL 15 was part of US 460. Until the 1960s, IL 15 went on the IL 160 corridor from Addieville to Okawville, then west on the present IL 177 corridor to Belleville. The section from Nashville to St. Libory was once IL 110, but this was back in the 1940s before US 460 was signed.
The current route was determined in 1967. US 460 was truncated in 1974.
In 2011, the old Parker truss bridge crossing the Wabash River was replaced by a beam bridge.

## Major intersections

| County | Location | mi | km | Destinations | Notes |
| St. Clair | East St. Louis | 0.0 | 0.0 | I-55 south / I-64 west / US 40 west / IL 3 south / Tudor Avenue – St. Louis, Cahokia | |
| St. Clair | East St. Louis | | | Historic National Road west (Riverpark Drive) – Eads Bridge | west end of National Road overlap |
| St. Clair | East St. Louis | | | Historic National Road east (10th Street) | east end of National Road overlap |
| St. Clair | Alorton | 3.4 | 5.5 | IL 163 south – Alorton, Centreville, Millstadt | Northern terminus of IL 163 |
| St. Clair | Alorton | 4.2 | 6.8 | I-255 / US 50 – Memphis, Chicago | I-255 exit 17 |
| St. Clair | Alorton–Centreville line | 5.6 | 9.0 | IL 157 (Bluff Road) – Cahokia | interchange |
| St. Clair | Belleville | 7.7 | 12.4 | IL 13 (North Belt) – Belleville, Centreville | interchange; no access from IL 15 east to IL 13 west or IL 13 east to IL 15 west |
| St. Clair | Belleville | | | Frank Scott Parkway West | interchange |
| St. Clair | Belleville | 12.1 | 19.5 | IL 158 (Centerville Avenue) – Millstadt | interchange |
| St. Clair | Belleville | 13.2 | 21.2 | IL 159 (Illinois Street) – Red Bud | interchange |
| St. Clair | Belleville | 14.6 | 23.5 | IL 13 west – Belleville | interchange; western end of IL 13 concurrency; westbound exit and eastbound entrance |
| St. Clair | Freeburg | 21.0 | 33.8 | IL 13 east – Pinckneyville | Eastern end of IL 13 concurrency |
| St. Clair | Fayetteville | 28.0 | 45.1 | IL 4 north – Mascoutah, Lebanon | Western end of IL 4 concurrency |
| St. Clair | St. Libory | 32.6 | 52.5 | IL 4 south – Marissa | Eastern end of IL 4 concurrency |
| Washington | Johannisburg Township | 38.7 | 62.3 | IL 153 south – Coulterville | Northern terminus of IL 153 |
| Washington | Plum Hill Township | 45.5 | 73.2 | IL 160 north – Addieville | Southern terminus of IL 160 |
| Washington | Nashville | 51.5 | 82.9 | IL 127 (Mill Street) – Carlyle, Pinckneyville, Washington County State Lake | |
| Washington | Ashley Township | 60.1 | 96.7 | US 51 south – Carbondale | Western end of US 51 concurrency |
| Washington | Ashley Township | 62.9 | 101.2 | US 51 north – Centralia | Eastern end of US 51 concurrency |
| Jefferson | Mt. Vernon | 75.7 | 121.8 | I-57 / I-64 – Effingham, East St. Louis, Cairo, Evansville | I-57 exit 95 |
| Jefferson | Mt. Vernon | 78.3 | 126.0 | IL 37 (10th Street) – Salem, Benton | |
| Wayne | Wayne City | 95.8 | 154.2 | IL 242 south – McLeansboro | Northern terminus of IL 242 |
| Wayne | Fairfield | 107 | 172 | US 45 north – Flora | Western end of US 45 concurrency |
| Wayne | Fairfield | 110 | 180 | US 45 south (1st Street) to I-64 – Enfield | Eastern end of US 45 concurrency |
| Edwards | Albion | 126 | 203 | IL 130 south – Grayville | west end of IL 130 concurrency |
| Edwards | Albion | 127 | 204 | IL 130 north – Olney | east end of IL 130 concurrency |
| Wabash | Mt. Carmel | 148 | 238 | IL 1 north – Lawrenceville | west end of IL 1 concurrency |
| Wabash | Mt. Carmel | 149 | 240 | IL 1 south (3rd Street) – Grayville | east end of IL 1 concurrency |
| Wabash | Mt. Carmel | 149.64 | 240.82 | SR 64 east – Princeton | Indiana state line (Mount Carmel Bridge over the Wabash River) |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus Incomplete access ||||||