Marshfield: Demographics & People
18,700 people call Marshfield home, in 9,075 households. Population shrank 0.1% from 18,718 (2022) to 18,700 (2024). Median age 43.2 years. (0.6y younger than Wood County; 4.9y older than Wisconsin). Children under 18 are 18% of the population. Population is 89% White (non-Hispanic) and 4% Hispanic or Latino. The community is relatively homogeneous (Simpson index 0.12). 52% of households are family-led. County is losing 585 residents per year (2022-2023). County health: 36% adult obesity, 14% smoke.
- 2.1 people per household (vs Wisconsin avg 2.4).
- 48% non-family households (singles, roommates) (vs Wisconsin 43%).
- 69 dependents per 100 working-age (youth + seniors / 18-64) (vs Wisconsin 66).
Population & Trend
Population shrank 0.1% from 18,718 (2022) to 18,700 (2024). Estimated 2026 population: ~18,681 (extrapolated at -0.1%/yr trend).
| Census data vintage | 2024 |
|---|---|
| Population | 138,013 people |
| Annual growth rate · Population change | -0.1% |
| Annual growth rate · Population (2022) | 18,718 |
| Annual growth rate · Population (2024) | 18,700 |
| Annual growth rate · Trend category | stable |
| Population | 18,700 people (vs Wisconsin 25,785) |
| Population Estimate | 18,655 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 43.2y is 4.3 years older than the U.S. median (38.9y). Children under 18 make up 18% — below the U.S. share of ~22%.
| Age Summary · Median age | 43.2 years (vs Wisconsin 38.3y) |
|---|---|
| Age Summary · Children Pct | 17.8% |
| Age Summary · Character | established |
| Age Summary · Total Pop | 18,700 |
| Age Summary · Under 18 | 3,331 |
| Age Summary · 18 To 34 | 4,016.0× |
| Age Summary · 35 To 64 | 7,029.0× |
| Age Summary · 65 Plus | 4,324 |
| Population under 18 | 3,331 |
| Median age | 43.2 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 18,700 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 | 17,355 |
|---|---|
| Black residents | 186 |
| Asian residents | 390 |
| Hispanic or Latino residents | 604 |
| Diversity Index · Diversity index (Simpson) | 12.2% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 93.6% |
| Asian population | 2.5% (vs Wisconsin 3.1%) |
| Black population | 1.2% (vs Wisconsin 2.7%) |
| Hispanic or Latino population | 3.5% (vs Wisconsin 6.6%) |
| White (non-Hispanic) population | 89.1% (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). 0.5% are foreign-born — below the U.S. average of 13.9%. 3% have naturalized to U.S. citizenship.
| Residents born in this state | 14,012 |
|---|---|
| Residents born in another state | 4,029 |
| Share born in this state | 74.9% |
| Share born in another state | 25.1% |
| Native-born U.S. citizens | 21.5% |
| Foreign-born residents | 0.5% |
| Naturalized citizens | 3.0% |
| Total foreign-born residents | 478 |
| From Europe | 40 |
| From Africa | 304 |
Households & Family Composition
9,075 households. Averaging 2.0 people each — smaller than the U.S. average of 2.5. 52% are family households — below the U.S. share of ~65%. Of 4,810 families, 23% are married couples with children.
| Children under 18 | 3,632 |
|---|---|
| Total families | 4,810 |
| Married couples with children | 1,109 |
| Single-parent households | 186 |
| Average household size | 2.05 |
| Women who gave birth (past year) | 15.5% |
| Grandparents living with grandchildren | 28 |
| Family households | 4,755 households (vs Wisconsin 7,092) |
| Households that are families | 52.4% (vs Wisconsin 57.2%) |
| Total households | 9,075 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. 13.9% 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) | 13.9% |
|---|---|
| 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 | 1,327 |
|---|---|
| Disability rate | 7.1% |
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. 437 residents live in group quarters (2.3% of population).
| Living in group quarters | 437 |
|---|
Veterans
| Veterans Services · Total count | 1 |
|---|
Sources: IRS BMF keyword
Other
| Congressional District · District | 7 |
|---|---|
| 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 | 9.60 |
| Family Score · Schools | 8 |
| Family Score · Childcare Centers | 12 |
| Family Score · Youth Sports Orgs | 2 |
| Family Score · Children Pct | 17.8% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 18,700, stable, established, middle-class, mixed |
| Town Summary · Population | 18,700 people (vs Wisconsin 25,785) |
| Town Summary · County | Marathon County |
Sources: NCES school congressional district assignment · federal dataset cascade