| Place Name | St. Catharine |
| Place Type | Census Designated Place |
| ZIP Code(s) | 64628 64631 |
| County | Linn County |
| Area Code(s) | 660 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 107 |
| Majority Ethnicity | White 100% |
| US Congressional District(s) | Missouri 6th |
| State House Districts | 7 |
| State Senate Districts | 18 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 100% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |