| Place Name | Fairmont City |
| Place Type | Village |
| County | Saint Clair County |
| Area Code(s) | 618 |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 2,596 |
| Population Growth Rate (2010-19) | -14.04% |
| Majority Ethnicity | Hispanic 3.37% |
| Metro/Micro Stats Area | St. Louis, MO-IL |
| US Congressional District(s) | Illinois 12th |
| State House Districts | 113 |
| State Senate Districts | 57 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 41.06% |
| African American | 1.7% |
| Hispanic | 3.37% |
| Asian | 0.71% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 53.16% |