St. Marks is a CDP located in Sedgwick County, Kansas. St. Marks has a 2025 population of 134. St. Marks is currently growing at a rate of 7.2% annually and its population has increased by 294.12% since the most recent census, which recorded a population of 34 in 2020.
The median age in St. Marks is 10.9 years: 10.2 years for males, and 0 years for females.
Data after 2023 is projected based on recent change
The racial composition of St. Marks includes 100% White, and smaller percentages for and multiracial populations.
Race | Population | Percentage (of total) |
---|---|---|
White | 87 | 100% |
Married
Widowed
Divorced
Separated
Never Married