Birnamwood: Demographics & People
643 people call Birnamwood home, in 294 households. Population shrank 6.5% from 688 (2022) to 643 (2024). Median age 50.2 years. (4.6y older than Shawano County; 11.9y older than Wisconsin). Children under 18 are 15% of the population. Population is 91% White (non-Hispanic) and 4% Hispanic or Latino. The community is relatively homogeneous (Simpson index 0.11). 51% of households are family-led. County is losing 585 residents per year (2022-2023). County health: 36% adult obesity, 14% smoke.
- 2.2 people per household (vs Wisconsin avg 2.4).
- 49% non-family households (singles, roommates) (vs Wisconsin 43%).
- 80 dependents per 100 working-age (youth + seniors / 18-64) (vs Wisconsin 66).
Population & Trend
Population shrank 6.5% from 688 (2022) to 643 (2024). Estimated 2026 population: ~601 (extrapolated at -3.3%/yr trend). Census Bureau Vintage estimate: 549.
| Census data vintage | 2024 |
|---|---|
| Population | 138,013 people |
| Annual growth rate · Population change | -6.5% |
| Annual growth rate · Population (2022) | 688 |
| Annual growth rate · Population (2024) | 643 |
| Annual growth rate · Trend category | shrinking |
| Population | 643 people (vs Wisconsin 25,785) |
| Population Estimate | 549 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 50.2y is 11.3 years older than the U.S. median (38.9y). Children under 18 make up 15% — below the U.S. share of ~22%.
| Age Summary · Median age | 50.2 years (vs Wisconsin 38.3y) |
|---|---|
| Age Summary · Children Pct | 15.2% |
| Age Summary · Character | retirement community |
| Age Summary · Total Pop | 643 |
| Age Summary · Under 18 | 98 |
| Age Summary · 18 To 34 | 146.0× |
| Age Summary · 35 To 64 | 211.0× |
| Age Summary · 65 Plus | 188 |
| Population under 18 | 98 |
| Median age | 50.2 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 643 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.11 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 634 |
|---|---|
| Asian residents | 7 |
| Hispanic or Latino residents | 30 |
| Diversity Index · Diversity index (Simpson) | 10.5% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 3 |
| Diversity Index · Largest group share | 94.5% |
| Asian population | 1.1% (vs Wisconsin 3.1%) |
| Hispanic or Latino population | 4.2% (vs Wisconsin 6.6%) |
| White (non-Hispanic) population | 90.7% (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 (8)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS).
| Residents born in this state | 511 |
|---|---|
| Residents born in another state | 110 |
| Share born in this state | 79.5% |
| Share born in another state | 20.5% |
| Native-born U.S. citizens | 17.1% |
| Naturalized citizens | 3.4% |
| Total foreign-born residents | 28 |
| From Europe | 3 |
| From Africa | 8 |
Households & Family Composition
294 households. Averaging 2.1 people each — smaller than the U.S. average of 2.5. 51% are family households — below the U.S. share of ~65%. Of 149 families, 18% are married couples with children.
| Children under 18 | 105 |
|---|---|
| Total families | 149 |
| Married couples with children | 27 |
| Single-parent households | 4 |
| Average household size | 2.12 |
| Women who gave birth (past year) | 8.8% |
| Grandparents living with grandchildren | 10 |
| Grandparents responsible for grandchildren | 3 |
| Family households | 149 households (vs Wisconsin 7,092) |
| Households that are families | 50.7% (vs Wisconsin 57.2%) |
| Total households | 294 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. 12.7% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 585 residents per year on net (IRS migration data).
| Moved within the county (past year) | 12.7% |
|---|---|
| Migration · People moving in (annual) | 133,534 |
| Migration · People moving out (annual) | 134,119 |
| Migration · Net migration (in − out) | -585 |
| 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 | 57 |
|---|---|
| Disability rate | 8.5% |
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. 28 residents live in group quarters (4.4% of population).
| Living in group quarters | 28 |
|---|
Other
| Congressional District · District | 8 |
|---|---|
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 55073 |
| Cdc Birth Rate · State Fips | 55 |
| Cdc Birth Rate · County Fips | 073 |
| Cdc Birth Rate · County | Marathon |
| Cdc Birth Rate · Birth Rate | 11.4% |
| Cdc Birth Rate · Lower Ci | 9.90 |
| Cdc Birth Rate · Upper Ci | 13.10 |
| Cdc Mortality · Fips | 55073 |
| Cdc Mortality · County | Marathon County |
| Cdc Mortality · Urban Rural | Small metro |
| Cdc Mortality · Total Deaths 2020 2023 | 6,184 |
| Cdc Vaccination · Fips | 55073 |
| Cdc Vaccination · County | Marathon County |
| Cdc Vaccination · Dose1 Pop Pct | 67.8% |
| Cdc Vaccination · Series Complete Pct | 62.3% |
| Cdc Vaccination · Booster Pct | 57.7% |
| Cdc Vaccination · Population 2019 | 135,692 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 1.80 |
| Family Score · Schools | 1 |
| Family Score · Childcare Centers | 1 |
| Family Score · Children Pct | 15.2% |
| Family Score · Rating | limited |
| Town Summary · Key Facts | population 643, shrinking, retirement community, middle-class, mixed |
| Town Summary · Population | 643 people (vs Wisconsin 25,785) |
| Town Summary · County | Marathon County |
Sources: NCES school congressional district assignment · federal dataset cascade