LaGrange is in Cook County, but Addison is in DuPage County. So I don't think LaGrange could have been part of Addison Township, even in 1870. Those lines between Cook and DuPage Counties have always been just as they are now. Addison Township is in Addison, Illinois, and the Township office is on Addison Road. Zip is 60101. I don't know the exact address, but it should get there if you say North Addison Road. By the way, guess whose office is in the Addison Township building? None other than our local hero, the Honorable Henry Hyde! Mildred in Lake Geneva, WI mallek@pensys.com