| Capital: | Edwardsville |
|---|---|
| Origen y Formación del condado: | St. Clair County and Randolph County |
| Población: | 269,282 habitantes |
| Área: | 725 sq mi |
| Localización del condado dentro de Illinois: |
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Localidades en Madison, Illinois
- Alhambra
- Alton
- Bethalto
- Chouteau Township Madison County
- Collinsville
- Cottage Hills
- Dorsey
- East Alton
- Edwardsville
- Fort Russell Township Madison County
- Glen Carbon
- Godfrey
- Granite City
- Grantfork
- Hamel
- Hartford
- Helvetia Township Madison County
- Highland
- Jarvis Township Madison County
- Leef Township Madison County
- Livingston
- Madison
- Marine
- Maryville
- Mitchell
- Moro
- Nameoki Township Madison County
- New Douglas
- Omphghent Township Madison County
- Pin Oak Township Madison County
- Pontoon Beach
- Rosewood Heights
- Roxana
- South Roxana
- St. Jacob
- Troy
- Venice
- Williamson
- Wood River
- Worden