| Place Name | Mason |
| Place Type | Town |
| ZIP Code(s) | 62443 |
| County | Effingham County |
| Area Code(s) | 618 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 361 |
| Population Growth Rate (2010-19) | -6.38% |
| Majority Ethnicity | White 94.58% |
| Metro/Micro Stats Area | Effingham, IL |
| US Congressional District(s) | Illinois 15th |
| State House Districts | 107 |
| State Senate Districts | 54 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 94.58% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 4.07% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 1.36% |