| Capital: | Havana |
|---|---|
| Origen y Formación del condado: | Tazewell and Menard County |
| Población: | 14,666 habitantes |
| Área: | 539 sq mi |
| Localización del condado dentro de Illinois: |
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Localidades en Mason, Illinois
- Allens Grove Township Mason County
- Bath
- Bath Township Mason County
- Crane Creek Township Mason County
- Easton
- Forest City Township Mason County
- Forest City
- Havana
- Havana Township Mason County
- Kilbourne
- Kilbourne Township Mason County
- Lynchburg Township Mason County
- Manito
- Manito Township Mason County
- Mason City Township Mason County
- Mason City
- Pennsylvania Township Mason County
- Quiver Township Mason County
- Salt Creek Township Mason County
- San Jose
- Sherman Township Mason County
- Topeka