Illinois Route 15
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| Route information | ||||
| Maintained by IDOT | ||||
| Length: | 149.64 mi[2] (240.82 km) | |||
| Existed: | 1918[1] – present | |||
| Major junctions | ||||
| West end: |     I-55 / I-64 / US 40 / IL 3 in East St. Louis |
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  I-255 / US 50 in East St. Louis US 51 in Ashley  I-57 / I-64 in Mt. Vernon US 45 in Fairfield |
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| East end: |  SR 64 in Mt. Carmel |
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| Location | ||||
| Counties: | St. Clair, Washington, Jefferson, Wayne, Edwards, Wabash | |||
| Highway system | ||||
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Illinois Route 15 is an east–west highway 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. This is a distance of 149.64 miles (240.82 km).[2]
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.[2]
The current route was determined in 1967. US 460 was truncated in 1974.[1]
Major intersections
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| County | Location | mi | km | Destinations | Notes |
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| St. Clair | East St. Louis |   I-55 north / I-64 east / US 40 east IL 3 north |
Western terminus of IL 15; southbound exit and northbound entrance onto I-55/I-64/US 40/IL 3 | ||
| Alorton |  IL 163 south |
Northern terminus of IL 163 | |||
| I-255 / US 50 |
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 IL 157 |
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| Belleville |  IL 13 |
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 IL 158 |
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 IL 159 |
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| IL 13 west |
western end of IL 13 concurrency; westbound exit and eastbound entrance | ||||
| Freeburg | IL 13 east |
Eastern end of IL 13 concurrency | |||
| Fayetteville |  IL 4 north |
Western end of IL 4 concurrency | |||
| St. Libory | IL 4 south |
Eastern end of IL 4 concurrency | |||
| Washington | Johannisburg Township |  IL 153 south |
Northern terminus of IL 153 | ||
| Plum Hill Township |  IL 160 north |
Southern terminus of IL 160 | |||
| Nashville |  IL 127 |
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| Ashley Township | US 51 south |
Western end of US 51 concurrency | |||
| Ashley | US 51 north |
Eastern end of US 51 concurrency | |||
| Jefferson | Mt. Vernon | I-57 / I-64 – Champaign, St. Louis, Evansville |
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 IL 37 |
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| Wayne | Wayne City |  IL 242 south |
Northern terminus of IL 242 | ||
| Fairfield | US 45 north |
Western end of US 45 concurrency | |||
| US 45 south |
Eastern end of US 45 concurrency | ||||
| Edwards | Albion |  IL 130 south |
Southern end of IL 130 concurrency | ||
| IL 130 north |
Northern end of IL 130 concurrency | ||||
| Wabash | Mt. Carmel |  IL 1 north |
Northern end of IL 1 concurrency | ||
| IL 1 south |
Southern end of IL 1 concurrency | ||||
| SR 64 east |
Indiana state line | ||||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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External links
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