St. Martin: Demographics & People
St. Martin's population stands at 313 people, in 141 households. Population shrank 2.8% from 322 (2022) to 313 (2024). Median age 36.8 years. (1.7y older than Stearns County; 2.2y younger than Minnesota). Children under 18 are 24% of the population. Population is 93% White (non-Hispanic) and 2% Hispanic or Latino. The community is relatively homogeneous (Simpson index 0.04). 59% of households are family-led. County is losing 1,507 residents per year (2022-2023). County health: 38% adult obesity, 15% smoke.
- 2.2 people per household.
- 41% non-family households (singles, roommates).
Population & Trend
Population shrank 2.8% from 322 (2022) to 313 (2024). Estimated 2026 population: ~304 (extrapolated at -1.4%/yr trend). Census Bureau Vintage estimate: 292.
| Census data vintage | 2024 |
|---|---|
| Population | 158,292 people |
| Annual growth rate · Population change | -2.8% |
| Annual growth rate · Population (2022) | 322 |
| Annual growth rate · Population (2024) | 313 |
| Annual growth rate · Trend category | declining |
| Population | 313 people |
| Population Estimate | 292 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 36.8y is 2.1 years younger than the U.S. median (38.9y). Children under 18 make up 24% — above the U.S. share of ~22%.
| Age Summary · Median age | 36.8 years (vs Minnesota 39.0y) |
|---|---|
| Age Summary · Children Pct | 24.0% |
| Age Summary · Character | family-oriented |
| Population under 18 | 75 |
| Median age | 36.8 years (vs Minnesota 39.0y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 313 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.04 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 320 |
|---|---|
| Hispanic or Latino residents | 7 |
| Diversity Index · Diversity index (Simpson) | 4.2% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 2 |
| Diversity Index · Largest group share | 97.9% |
| Asian population | 1.0% |
| Hispanic or Latino population | 1.9% |
| White (non-Hispanic) population | 93.0% |
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 (7)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS).
| Residents born in this state | 279 |
|---|---|
| Residents born in another state | 31 |
| Share born in this state | 89.1% |
| Share born in another state | 10.9% |
| Native-born U.S. citizens | 9.9% |
| Naturalized citizens | 1.0% |
| Total foreign-born residents | 6 |
| From Europe | 3 |
Households & Family Composition
141 households. Averaging 2.3 people each — smaller than the U.S. average of 2.5. 59% are family households — below the U.S. share of ~65%. Of 93 families, 32% are married couples with children.
| Children under 18 | 64 |
|---|---|
| Total families | 93 |
| Married couples with children | 30 |
| Average household size | 2.27 |
| Women who gave birth (past year) | 7.4% |
| Grandparents living with grandchildren | 7 |
| Grandparents responsible for grandchildren | 4 |
| Family households | 83 households |
| Households that are families | 58.9% |
| Total households | 141 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. 10.1% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 1,507 residents per year on net (IRS migration data).
| Moved within the county (past year) | 10.1% |
|---|---|
| Migration · People moving in (annual) | 154,040 |
| Migration · People moving out (annual) | 155,547 |
| Migration · Net migration (in − out) | -1,507 |
| 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 | 8 |
|---|---|
| Disability rate | 2.6% |
Other
| Congressional District · District | 7 |
|---|---|
| Congressional District · Formatted | MN-07 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 27,145 |
| Cdc Birth Rate · State Fips | 27 |
| Cdc Birth Rate · County Fips | 145 |
| Cdc Birth Rate · County | Stearns |
| Cdc Birth Rate · Birth Rate | 8.1% |
| Cdc Birth Rate · Lower Ci | 7.00 |
| Cdc Birth Rate · Upper Ci | 9.20 |
| Cdc Mortality · Fips | 27,145 |
| Cdc Mortality · County | Stearns County |
| Cdc Mortality · Urban Rural | Small metro |
| Cdc Mortality · Total Deaths 2020 2023 | 6,490 |
| Cdc Vaccination · Fips | 27,145 |
| Cdc Vaccination · County | Stearns County |
| Cdc Vaccination · Dose1 Pop Pct | 66.4% |
| Cdc Vaccination · Series Complete Pct | 61.7% |
| Cdc Vaccination · Booster Pct | 56.8% |
| Cdc Vaccination · Population 2019 | 161,075 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 10 |
| Family Score · Schools | 20 |
| Family Score · Children Pct | 24.0% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 313, declining, family-oriented, middle-class, mixed |
| Town Summary · Population | 313 people |
| Town Summary · County | Stearns County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade