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Delavan, Illinois. Homefacts City Report. Delavan is located in Tazewell County, IL. The population is 1,568, making Delavan the 8th largest city in Tazewell County. There are 3 public schools in Delavan with an average Homefacts rating of B. The total crime rate for Delavan is very low, and there are 4 registered sex offenders residing in the city.
The first railroad to operate in Randolph county was the Belleville / Southern Illinois Railway. It ran from East St.Louis to Belleville, also going through Tilden and Coulterville to Duquoin, where it connected with the Illinois Central Railroad. The first train came through Coulterville on December 5, 1870.