| Capital: | Monmouth |
|---|---|
| Origen y Formación del condado: | Schuyler County |
| Población: | 17,707 habitantes |
| Área: | 543 sq mi |
| Localización del condado dentro de Illinois: |
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Localidades en Warren, Illinois
- Alexis
- Berwick Township Warren County
- Cameron
- Cold Brook Township Warren County
- Ellison Township Warren County
- Floyd Township Warren County
- Gerlaw
- Greenbush Township Warren County
- Hale Township Warren County
- Kelly Township Warren County
- Kirkwood
- Lenox Township Warren County
- Little York
- Monmouth
- Monmouth Township Warren County
- Point Pleasant Township Warren County
- Roseville
- Roseville Township Warren County
- Smithshire
- Spring Grove Township Warren County
- Sumner Township Warren County
- Swan Township Warren County
- Tompkins Township Warren County