The Roberts House is a historic building in Canonsburg, Pennsylvania, listed on the National Register of Historic Places. It is designated as a historic residential landmark/farmstead by the Washington County History & Landmarks Foundation. The Greater Canonsburg Heritage Society erected a historical marker near the house, which is the last remainin…The Roberts House is a historic building in Canonsburg, Pennsylvania, listed on the National Register of Historic Places. It is designated as a historic residential landmark/farmstead by the Washington County History & Landmarks Foundation. The Greater Canonsburg Heritage Society erected a historical marker near the house, which is the last remaining structure from Jefferson College.