St. John: Demographics & People
1,172 people call St. John home, in 414 households. Population shrank 6.0% from 1,247 (2022) to 1,172 (2024). Median age 38.7 years. (3.6y younger than Stafford County; 1.2y older than Kansas). Children under 18 are 25% of the population. Population is 78% White (non-Hispanic) and 16% Hispanic or Latino. The community is somewhat diverse (Simpson index 0.30). 69% of households are family-led. County is losing 150 residents per year (2022-2023). County health: 39% adult obesity, 18% smoke.
- 2.8 people per household.
- 31% non-family households (singles, roommates).
Population & Trend
Population shrank 6.0% from 1,247 (2022) to 1,172 (2024). Estimated 2026 population: ~1,102 (extrapolated at -3.0%/yr trend). Census Bureau Vintage estimate: 1,014.
| Census data vintage | 2024 |
|---|---|
| Population | 4,072 people |
| Annual growth rate · Population change | -6.0% |
| Annual growth rate · Population (2022) | 1,247 |
| Annual growth rate · Population (2024) | 1,172 |
| Annual growth rate · Trend category | shrinking |
| Population | 1,172 people |
| Population Estimate | 1,014 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 38.7y is 0.2 years younger than the U.S. median (38.9y). Children under 18 make up 25% — above the U.S. share of ~22%.
| Age Summary · Median age | 38.7 years (vs Kansas 37.5y) |
|---|---|
| Age Summary · Children Pct | 24.6% |
| Age Summary · Character | family-oriented |
| Population under 18 | 288 |
| Median age | 38.7 years (vs Kansas 37.5y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 1,172 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.30 (0 = single group, 1 = perfectly even distribution); this is read as somewhat diverse.
| White residents | 1,084 |
|---|---|
| Hispanic or Latino residents | 239 |
| Diversity Index · Diversity index (Simpson) | 29.6% |
| Diversity Index · Diversity label | somewhat diverse |
| Diversity Index · Groups counted | 2 |
| Diversity Index · Largest group share | 81.9% |
| Hispanic or Latino population | 16.5% |
| White (non-Hispanic) population | 77.9% |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Ancestry
Self-reported ancestry from Census ACS — what residents report as their ethnic origin, separate from race. Counts can exceed population because people can list multiple ancestries.
Top (8)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS).
| Residents born in this state | 899 |
|---|---|
| Residents born in another state | 192 |
| Share born in this state | 76.7% |
| Share born in another state | 23.3% |
| Native-born U.S. citizens | 16.4% |
| Naturalized citizens | 6.9% |
| Total foreign-born residents | 106 |
Households & Family Composition
414 households. Averaging 2.8 people each — larger than the U.S. average of 2.5. 69% are family households — above the U.S. share of ~65%. Of 279 families, 49% are married couples with children.
| Children under 18 | 318 |
|---|---|
| Total families | 279 |
| Married couples with children | 138 |
| Average household size | 2.84 |
| Women who gave birth (past year) | 13.5% |
| Grandparents living with grandchildren | 29 |
| Grandparents responsible for grandchildren | 13 |
| Family households | 287 households |
| Households that are families | 69.3% |
| Total households | 414 households |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 9.8% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 150 residents per year on net (IRS migration data).
| Moved within the county (past year) | 9.8% |
|---|---|
| Migration · People moving in (annual) | 3,566 |
| Migration · People moving out (annual) | 3,716 |
| Migration · Net migration (in − out) | -150 |
| Migration · Year | 2022-2023 |
Sources: IRS SOI Migration 2021-2022 · Refreshed 2026-04-12
Disability
Census ACS measures self-reported functional limitations — vision, hearing, mobility, cognitive, self-care, or independent-living. The U.S. baseline disability rate is about 12–13%; rates trend higher with median age.
| Residents with a disability | 95 |
|---|---|
| Disability rate | 8.0% |
Group Quarters
Group quarters are non-household living arrangements counted by the Census — college dormitories, nursing homes, military barracks, group homes, correctional facilities, and similar institutional or shared housing. 57 residents live in group quarters (4.9% of population).
| Living in group quarters | 57 |
|---|
Other
| Congressional District · District | 4 |
|---|---|
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 20,185 |
| Cdc Birth Rate · State Fips | 20 |
| Cdc Birth Rate · County Fips | 185 |
| Cdc Birth Rate · County | Stafford |
| Cdc Birth Rate · Birth Rate | 31.3% |
| Cdc Birth Rate · Lower Ci | 19.90 |
| Cdc Birth Rate · Upper Ci | 46.90 |
| Cdc Mortality · Fips | 20,185 |
| Cdc Mortality · County | Stafford County |
| Cdc Mortality · Urban Rural | Noncore |
| Cdc Mortality · Total Deaths 2020 2023 | 173 |
| Cdc Vaccination · Fips | 20,185 |
| Cdc Vaccination · County | Stafford County |
| Cdc Vaccination · Dose1 Pop Pct | 52.6% |
| Cdc Vaccination · Series Complete Pct | 48.2% |
| Cdc Vaccination · Booster Pct | 52.3% |
| Cdc Vaccination · Population 2019 | 4,156 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 2.00 |
| Family Score · Schools | 2 |
| Family Score · Children Pct | 24.6% |
| Family Score · Rating | limited |
| Town Summary · Key Facts | population 1,172, shrinking, family-oriented, middle-class, mixed |
| Town Summary · Population | 1,172 people |
| Town Summary · County | Stafford County |
Sources: NCES school congressional district assignment · federal dataset cascade