South Union Township has three districts.
District #1 includes areas west of Morgantown Road to the township western boundary, those residents vote at the Laurel Highlands Middle School.
District #2 includes areas between Morgantown Road and Marshall Parkway (Uniontown Bypass )/Mon-Fayette Expressway. These residents vote at Hatfield Elementary School.
District #3 includes all areas east of the Marshall Parkway (Uniontown Bypass ) / Mon-Fayette Expressway to the township eastern boundary. These residents vote at Hutchinson Elementary School.