| Capital: | Aledo |
|---|---|
| Origen y Formación del condado: | Schuyler County |
| Población: | 16,434 habitantes |
| Área: | 561 sq mi |
| Localización del condado dentro de Illinois: |
|
Localidades en Mercer, Illinois
- Abington Township Mercer County
- Aledo
- Alexis
- Duncan Township Mercer County
- Eliza Township Mercer County
- Greene Township Mercer County
- Joy
- Keithsburg
- Keithsburg Township Mercer County
- Matherville
- Mercer Township Mercer County
- Millersburg Township Mercer County
- New Boston
- New Boston Township Mercer County
- New Windsor
- North Henderson
- North Henderson Township Mercer County
- Ohio Grove Township Mercer County
- Perryton Township Mercer County
- Preemption Township Mercer County
- Richland Grove Township Mercer County
- Rivoli Township Mercer County
- Seaton
- Sherrard
- Suez Township Mercer County
- Viola