St. Marks is a CDP located in Sedgwick County, Kansas. St. Marks has a 2026 population of 107. St. Marks is currently growing at a rate of 7% annually and its population has decreased by 0% since the most recent census, which recorded a population of 0 in 2020.
The median age in St. Marks is 21.4 years: 17.4 years for males, and 0 years for females. For every 100 females there are 358.8 males.
Data after 2023 is projected based on recent change
Overall: 21.4 years
Female: 0 years
Male: 17.4 years
There are 84 adults, (0 of whom are seniors) in St. Marks.
Female: 34 (21.8%)
Male: 122 (78.2%)
The racial composition of St. Marks includes 100% White, and smaller percentages for and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 156 | 100% |