Conrad, IllinoisConrad is an unincorporated community in Calhoun County, Illinois, United States. Conrad is southwest of Brussels. Hetzer Cemetery is located in the community.HistoryA post office called Conrad opened up in the community in 1880 and shut down in 1903. At the time of the post office's opening, Conrad had a river landing called Martin's Landing. It was owned by the postmaster of the Conrad post office, John Martins.