Illinois Route 172

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Illinois Route 172 marker

Illinois Route 172
Route information
Maintained by IDOT
Length 13.06 mi[2] (21.02 km)
Existed 1946[1] – present
Major junctions
South end IL 92 in Yorktown
North[3] end IL 40 in Tampico
Counties Bureau, Whiteside
Highway system
I-172 IL 173

Illinois Route 172 is an inverted-'L' shaped highway in northwestern Illinois, though it is marked as being a north–south highway on signage. It runs from Illinois Route 40 to Illinois Route 92 by way of Tampico. This is a distance of 13.06 miles (21.02 km).[2] Illinois 172 is also a part of the Ronald Reagan Trail.

Route description[edit]

Illinois 172 runs north from Illinois 92 through Tampico. It then runs east over a feeder for the Hennepin Canal to Illinois 40. Illinois 172 is a two-lane surface road for its entire length. It is known as Main Street through Tampico, Tampico Road around Tampico, and Star Road for the east–west portion.


SBI Route 172 originally ran from Libertyville to Gurnee; this became Illinois Route 63, and then Illinois Route 21. In 1946 Illinois 172 was used on former Illinois Route 226, which in addition to its current route ran west to Prophetstown, forming a 'T'-shaped route. The 'spur' to Prophetstown was dropped in 1974. There have been no changes since.[1]

Major Intersections[edit]

County Location mi[2] km Destinations Notes
Bureau 0.00 0.00 IL 92 – Mendota, Moline
Whiteside 13.06 21.02 IL 40
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b Carlson, Rich (2005-04-15). "Illinois Highways Page: Routes 161 thru 180". Retrieved 2006-08-15. 
  2. ^ a b c Illinois Technology Transfer Center (2006). "T2 GIS Data". Retrieved 2007-11-08. 
  3. ^ Sarjeant, Charles (2005-06-18). "Illinois Highway Ends: Illinois 172". Retrieved 2006-08-15.