Illinois Route 31
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| Route information | ||||
| Maintained by IDOT | ||||
| Length: | 58.41 mi (94.00 km) | |||
| Existed: | 1937 – present | |||
| Major junctions | ||||
| South end: |
 US 34 in Oswego
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| North end: |
  US 12 / CR A16 in Richmond
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| Location | ||||
| Counties: | Kendall, Kane, McHenry | |||
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| Location: | Aurora–Crystal Lake |
| Existed: | 1926–1934 |
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| Location: | Algonquin |
| Length: | 1.12 mi (1.80 km) |
| Existed: | August 31, 2014–present |
Illinois Route 31 (IL 31) is a north–south state road in northeastern Illinois, United States. It travels from U.S. Route 34 (US 34) in Oswego north to US 12, near the Wisconsin state line, just south of Richmond. IL 31 is 58.41 miles (94.00 km) long.
IL 31 follows the Fox River along the western bank. It parallels IL 25, which travels along the eastern bank of the Fox River. It travels concurrent with IL 120 in McHenry.
IL 31 is called Richmond Road north of IL 120 and Front Street south of IL 120 in McHenry, Main Street in Algonquin, Western Avenue in Carpentersville, Eighth Street in West Dundee, State Street in Elgin, La Fox Street in South Elgin, Second Street in St. Charles, First Street in Geneva, Batavia Avenue in Batavia, Lincolnway Street in North Aurora, Lake Street (Southbound) and River Street (Northbound) in Aurora & Momtgomery. It is also, along with IL 25, signed as part of the Fox River Valley area. IL 31 between Aurora and Geneva was considered part of the Lincoln Highway transcontinental route.
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Wikipedia