St. Peter: Demographics & People
1,413 people call St. Peter home, in 546 households. Population grew 0.7% from 1,403 (2022) to 1,413 (2024). Median age 45.5 years. (3.6y older than Fond du Lac County; 7.2y older than Wisconsin). Children under 18 are 29% of the population. Population is 91% White (non-Hispanic) and 6% Hispanic or Latino. The community is relatively homogeneous (Simpson index 0.12). 70% of households are family-led. County health: 42% adult obesity, 18% smoke.
- 2.6 people per household (vs Wisconsin avg 2.4).
- 30% non-family households (singles, roommates) (vs Wisconsin 43%).
- 86 dependents per 100 working-age (youth + seniors / 18-64) (vs Wisconsin 66).
Population & Trend
Population grew 0.7% from 1,403 (2022) to 1,413 (2024) — about 1.2× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~1,423 (extrapolated at 0.4%/yr trend). Census Bureau Vintage estimate: 1,436.
| Census data vintage | 2024 |
|---|---|
| Population | 104,154 people |
| Annual growth rate · Population change | 0.7% |
| Annual growth rate · Population (2022) | 1,403 |
| Annual growth rate · Population (2024) | 1,413 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | stable |
| Population | 1,413 people (vs Wisconsin 25,785) |
| Population Estimate | 1,436 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 45.5y is 6.6 years older than the U.S. median (38.9y). Children under 18 make up 29% — above the U.S. share of ~22%.
| Age Summary · Median age | 45.5 years (vs Wisconsin 38.3y) |
|---|---|
| Age Summary · Children Pct | 29.3% |
| Age Summary · Character | established |
| Age Summary · Total Pop | 1,413 |
| Age Summary · Under 18 | 414 |
| Age Summary · 18 To 34 | 157.0× |
| Age Summary · 35 To 64 | 604.0× |
| Age Summary · 65 Plus | 238 |
| Population under 18 | 414 |
| Median age | 45.5 years (vs Wisconsin 38.3y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 1,413 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.12 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 1,288 |
|---|---|
| Hispanic or Latino residents | 90 |
| Diversity Index · Diversity index (Simpson) | 12.2% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 2 |
| Diversity Index · Largest group share | 93.5% |
| Hispanic or Latino population | 5.5% (vs Wisconsin 6.6%) |
| White (non-Hispanic) population | 91.2% (vs Wisconsin 81.6%) |
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 (6)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS). 6.5% are foreign-born — below the U.S. average of 13.9%. 2% have naturalized to U.S. citizenship.
| Residents born in this state | 1,124 |
|---|---|
| Residents born in another state | 164 |
| Share born in this state | 79.5% |
| Share born in another state | 20.5% |
| Native-born U.S. citizens | 11.6% |
| Foreign-born residents | 6.5% |
| Naturalized citizens | 2.3% |
| Total foreign-born residents | 14 |
Households & Family Composition
546 households. Averaging 2.6 people each — larger than the U.S. average of 2.5. 70% are family households — above the U.S. share of ~65%. Of 389 families, 36% are married couples with children.
| Children under 18 | 401 |
|---|---|
| Total families | 389 |
| Married couples with children | 139 |
| Single-parent households | 18 |
| Average household size | 2.65 |
| Women who gave birth (past year) | 16.0% |
| Grandparents living with grandchildren | 868 |
| Grandparents responsible for grandchildren | 502 |
| Family households | 385 households (vs Wisconsin 7,092) |
| Households that are families | 70.5% (vs Wisconsin 57.2%) |
| Total households | 546 households (vs Wisconsin 10,843) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 7.5% moved within the county in the past year — the U.S. baseline is roughly 8–10%.
| Moved within the county (past year) | 7.5% |
|---|---|
| Migration · People moving in (annual) | 97,765 |
| Migration · People moving out (annual) | 97,782 |
| Migration · Net migration (in − out) | -17 |
| 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 | 32 |
|---|---|
| Disability rate | 2.3% |
Other
| Congressional District · District | 6 |
|---|---|
| Congressional District · Formatted | WI-06 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 55039 |
| Cdc Birth Rate · State Fips | 55 |
| Cdc Birth Rate · County Fips | 039 |
| Cdc Birth Rate · County | Fond Du Lac |
| Cdc Birth Rate · Birth Rate | 12.0% |
| Cdc Birth Rate · Lower Ci | 10.30 |
| Cdc Birth Rate · Upper Ci | 13.90 |
| Cdc Mortality · Fips | 55039 |
| Cdc Mortality · County | Fond du Lac County |
| Cdc Mortality · Urban Rural | Small metro |
| Cdc Mortality · Total Deaths 2020 2023 | 3,990 |
| Cdc Vaccination · Fips | 55039 |
| Cdc Vaccination · County | Fond du Lac County |
| Cdc Vaccination · Dose1 Pop Pct | 63.1% |
| Cdc Vaccination · Series Complete Pct | 58.0% |
| Cdc Vaccination · Booster Pct | 59.5% |
| Cdc Vaccination · Population 2019 | 103,403 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 10 |
| Family Score · Schools | 20 |
| Family Score · Children Pct | 29.3% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 1,413, stable, established, affluent, white collar |
| Town Summary · Population | 1,413 people (vs Wisconsin 25,785) |
| Town Summary · County | Fond du Lac County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade