St. Peter: Demographics & People
About 12,185 people live in St. Peter, in 4,059 households. Population grew 0.8% from 12,085 (2022) to 12,185 (2024). Median age 35.6 years. (2.7y younger than Nicollet County; 3.4y younger than Minnesota). Children under 18 are 17% of the population. Population is 80% White (non-Hispanic) and 8% Hispanic or Latino. The community is somewhat diverse (Simpson index 0.30). 56% of households are family-led. County is losing 322 residents per year (2022-2023). County health: 36% adult obesity, 15% smoke.
- 3.0 people per household.
- 44% non-family households (singles, roommates).
Population & Trend
Population grew 0.8% from 12,085 (2022) to 12,185 (2024) — about 1.4× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~12,286 (extrapolated at 0.4%/yr trend). Census Bureau Vintage estimate: 12,422.
| Census data vintage | 2024 |
|---|---|
| Population | 34,454 people |
| Annual growth rate · Population change | 0.8% |
| Annual growth rate · Population (2022) | 12,085 |
| Annual growth rate · Population (2024) | 12,185 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | stable |
| Population | 12,185 people |
| Population Estimate | 12,422 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 35.6y is 3.3 years younger than the U.S. median (38.9y). Children under 18 make up 17% — below the U.S. share of ~22%.
| Age Summary · Median age | 35.6 years (vs Minnesota 39.0y) |
|---|---|
| Age Summary · Children Pct | 17.2% |
| Age Summary · Character | family-oriented |
| Population under 18 | 2,093 |
| Median age | 35.6 years (vs Minnesota 39.0y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 12,185 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 | 9,728 |
|---|---|
| Black residents | 880 |
| Asian residents | 206 |
| Hispanic or Latino residents | 954 |
| Diversity Index · Diversity index (Simpson) | 30.4% |
| Diversity Index · Diversity label | somewhat diverse |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 82.7% |
| Asian population | 1.3% |
| Black population | 7.3% |
| Hispanic or Latino population | 8.1% |
| White (non-Hispanic) population | 79.5% |
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). 1.7% are foreign-born — below the U.S. average of 13.9%. 6% have naturalized to U.S. citizenship.
| Residents born in this state | 8,575 |
|---|---|
| Residents born in another state | 2,637 |
| Share born in this state | 70.4% |
| Share born in another state | 29.6% |
| Native-born U.S. citizens | 21.6% |
| Foreign-born residents | 1.7% |
| Naturalized citizens | 6.2% |
| Total foreign-born residents | 776 |
| From Europe | 113 |
| From Africa | 108 |
Households & Family Composition
4,059 households. Averaging 2.2 people each — smaller than the U.S. average of 2.5. 56% are family households — below the U.S. share of ~65%. Of 2,297 families, 32% are married couples with children.
| Children under 18 | 2,048 |
|---|---|
| Total families | 2,297 |
| Married couples with children | 740 |
| Single-parent households | 74 |
| Average household size | 2.25 |
| Women who gave birth (past year) | 9.0% |
| Grandparents living with grandchildren | 29 |
| Grandparents responsible for grandchildren | 18 |
| Family households | 2,257 households |
| Households that are families | 55.6% |
| Total households | 4,059 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. 19.1% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 322 residents per year on net (IRS migration data).
| Moved within the county (past year) | 19.1% |
|---|---|
| Migration · People moving in (annual) | 33,161 |
| Migration · People moving out (annual) | 33,483 |
| Migration · Net migration (in − out) | -322 |
| 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 | 1,174 |
|---|---|
| Disability rate | 9.9% |
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. 3,047 residents live in group quarters (25.0% of population).
| Living in group quarters | 3,047 |
|---|
Other
| Congressional District · District | 1 |
|---|---|
| Congressional District · Formatted | MN-01 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 27,103 |
| Cdc Birth Rate · State Fips | 27 |
| Cdc Birth Rate · County Fips | 103 |
| Cdc Birth Rate · County | Nicollet |
| Cdc Birth Rate · Birth Rate | 4.9% |
| Cdc Birth Rate · Lower Ci | 3.50 |
| Cdc Birth Rate · Upper Ci | 6.60 |
| Cdc Mortality · Fips | 27,103 |
| Cdc Mortality · County | Nicollet County |
| Cdc Mortality · Urban Rural | Small metro |
| Cdc Mortality · Total Deaths 2020 2023 | 761 |
| Cdc Vaccination · Fips | 27,103 |
| Cdc Vaccination · County | Nicollet County |
| Cdc Vaccination · Dose1 Pop Pct | 68.7% |
| Cdc Vaccination · Series Complete Pct | 64.9% |
| Cdc Vaccination · Booster Pct | 66.2% |
| Cdc Vaccination · Population 2019 | 34,274 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 3.00 |
| Family Score · Schools | 4 |
| Family Score · Children Pct | 17.2% |
| Family Score · Rating | limited |
| Town Summary · Key Facts | population 12,185, stable, family-oriented, middle-class, mixed |
| Town Summary · Population | 12,185 people |
| Town Summary · County | Nicollet County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade