St. John is located in Stafford County, Kansas. St. John has a 2025 population of 950 . It is also the county seat of Stafford County . St. John is currently declining at a rate of -0.94% annually and its population has decreased by -5.09% since the most recent census, which recorded a population of 1,001 in 2020.
The average household income in St. John is $88,778 with a poverty rate of 9.18%. The median age in St. John is 36.3 years: 33.5 years for males, and 43.6 years for females. For every 100 females there are 104.5 males.
Data after 2023 is projected based on recent change
The racial composition of St. John includes 89.32% White, 4.05% other race, and smaller percentages for Native American and multiracial populations.
White (89.32%)
Two or more races (4.79%)
Other race (4.05%)
Native American (1.84%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 970 | 89.32% |
| Two or more races | 52 | 4.79% |
| Other race | 44 | 4.05% |
| Native American | 20 | 1.84% |
Married
Widowed
Divorced
Separated
Never Married
St. John's average per capita income is $45,598. Household income levels show a median of $77,552. The poverty rate stands at 9.18%.
Name | Median | Mean |
|---|---|---|
| Married Families | $92,500 | - |
| Families | $91,150 | $95,129 |
| Households | $77,552 | $88,778 |
| Non Families | $40,833 | $71,098 |
Average Income
Median Household Income
Poverty Rate