History
SBI Route 21 ran from Chicago to Antioch along Milwaukee Avenue and current Illinois Routes 43, 83 and 137. In Chicago, it also ran along Elston Avenue. In 1940, the route was moved to a new route to Grayslake, and then continued to Antioch. In 1963, Illinois 21 was dropped entirely from Grayslake to Antioch, and in 1972, it was shortened further to its current southern terminus at Illinois 43. The next year, Illinois 21 was rerouted to Gurnee. Illinois 83 and 137 replaced the old Route 21 to (and through) Grayslake.
Read more about this topic: Illinois Route 21
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