| Place Name | St. Marks |
| Place Type | Census Designated Place |
| ZIP Code(s) | 67030 |
| County | Sedgwick County |
| Area Code(s) | 316 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 34 |
| Majority Ethnicity | White 100% |
| Metro/Micro Stats Area | Wichita, KS |
| US Congressional District(s) | Kansas 4th |
| State House Districts | 101 |
| State Senate Districts | 27 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 100% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |