Cities within District
- Alhambra
- Baldwin
- Belleville
- Cahokia
- Caseyville
- Chester
- Collinsville
- Columbia
- Coulterville
- Dozaville
- Dupo
- East Carondelet
- Ellis Grove
- Evansville
- Fairview Heights
- Fayetteville
- Freeburg
- Fults
- Granite City
- Hecker
- Highland
- Kaskaskia
- Lebanon
- Lenzburg
- Lively Grove
- Madison
- Maeystown
- Marine
- Marissa
- Maryville
- Mascoutah
- Millstadt
- Mitchell
- Modoc
- New Athens
- New Douglas
- O’Fallon
- Pierron
- Pontoon Beach
- Prairie Du Rocher
- Red Bud
- Renault
- Rockwood
- Ruma
- Sauget
- Scott AFB
- Shiloh
- Smithton
- Sparta
- St. Jacob
- St. Libory
- Steeleville
- Stone Church
- Summerfield
- Swansea
- Tilden
- Troy
- Valmeyer
- Venice
- Walsh
- Waterloo
- Welge
Some portions of the following cities are considered in-district for Southwestern. Please call 618-235-2700 ext. 5660 for eligible streets/addresses.
- Campbell Hill
- Edwardsville
- Glen Carbon
- New Baden
- Pocahontas
- Percy
- Trenton
- Venedy
