The Peterstown House is a historic building located at 275 N. Main St. in Waterloo, Illinois. The saltbox building was constructed in the mid-1830s; an addition was placed on its north side around the 1860s. Emory Peter Rogers, for whom the house and surrounding neighborhood were named, was the first owner of the building. The building served as an inn and stagecoach stop along the Kaskaskia-Cahokia Trail, which was the first road in Illinois.