Census tract · Fond du Lac County
Census Tract 421, Fond du Lac County, Wisconsin
Census Tract 421, GEOID 55039042100, in Fond du Lac County, Wisconsin, partly within Forest (town), Fond du Lac County, Marshfield (town), Fond du Lac County, Calumet (town), Mount Calvary and St. Cloud. 4,707 residents in the ACS 2020-2024 5-year estimates (±335); the 2020 Census counted 4,547.
Residents, 2020-2024
4,707
±335 (90% margin)
2020 Census count: 4,547
Median household income
$94,625
±$11,780 (90% margin)
Fond du Lac County: $74,275
Median home value
$246,500
±$15,515 (90% margin)
Fond du Lac County: $222,800
Median gross rent
$795
±$132 (90% margin)
Fond du Lac County: $960
Where is Census Tract 421?
Census Tract 421 is one of 23 census tracts in Fond du Lac County, Wisconsin. It covers 101.62 square miles of land, 45 residents per square mile in 2020. Its GEOID, 55039042100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Forest (town), Fond du Lac County | 34% |
| Marshfield (town), Fond du Lac County | 31% |
| Calumet (town) | 22% |
| Mount Calvary | 7% |
| St. Cloud | 6% |
8 census tracts border Census Tract 421: Tract 204 in Calumet County ($73,523), Tract 206 in Calumet County ($66,278), Tract 414 ($95,637), Tract 419.02 ($92,500), Tract 420.01 ($114,886), Tract 420.02 ($105,345), Tract 104 in Sheboygan County ($86,900) and Tract 19 in Winnebago County ($86,010). The figure in brackets is each tract's median household income.
Whether a tract counts as low- or moderate-income for bank lending (the Community Reinvestment Act) is set by the FFIEC against its metro area's family income: look it up in the FFIEC census geocoder.
Source: 2024 Gazetteer and 2020 block assignment files, U.S. Census Bureau · Census reference files
How many people live in Census Tract 421?
The 2020-2024 American Community Survey puts Census Tract 421's population at 4,707 (±335) in 1,943 households; the 2020 Census counted 4,547 residents and 2,155 housing units.
| Measure | Tract 421 | Fond du Lac County |
|---|---|---|
| Total population | 4,707 ±335 | 104,137 |
| Households | 1,943 ±200 | 43,243 |
| Average household size | 2.35 ±0.16 | 2.33 |
| Housing units | 2,196 ±189 | 46,094 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Census Tract 421?
The median resident of Census Tract 421 is 47.8 years old; 20.4% are under 18 and 26.3% are 65 or older. The largest group is non-Hispanic white residents at 97.3%, then Hispanic or Latino residents (of any race) at 1.1%. 0.6% of residents were born outside the United States.
| Measure | Tract 421 | Fond du Lac County |
|---|---|---|
| Median age | 47.8 ±3.7 | 41.9 |
| Under 18 years | 20.4% ±3.3 pts | 21.1% |
| 65 years and over | 26.3% ±4.0 pts | 19.8% |
| Hispanic or Latino (any race) | 1.1% ±0.8 pts | 6.8% |
| White alone, not Hispanic | 97.3% ±1.0 pts | 86.0% |
| Black or African American alone, not Hispanic | 0.3% ±0.4 pts | 1.7% |
| Asian alone, not Hispanic | 0.2% ±0.2 pts | 1.8% |
| American Indian and Alaska Native alone, not Hispanic | 0.1% ±0.1 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.5 pts | 0.0% |
| Two or more races, not Hispanic | 0.8% ±0.5 pts | 3.0% |
| Some other race alone, not Hispanic | 0.0% ±0.1 pts | 0.5% |
| Born outside the United States | 0.6% ±0.3 pts | 3.7% |
| Speak a language other than English at home (age 5+) | 1.3% ±0.5 pts | 6.0% |
| Civilian veterans (age 18+) | 5.7% ±1.6 pts | 7.1% |
| With a disability | 10.6% ±2.6 pts | 12.3% |
| No health insurance coverage | 2.8% ±1.1 pts | 4.1% |
| High school graduate or higher (age 25+) | 94.3% ±2.4 pts | 93.1% |
| Bachelor's degree or higher (age 25+) | 20.9% ±2.8 pts | 22.3% |
| Graduate or professional degree (age 25+) | 6.7% ±2.0 pts | 7.1% |
| Lived in the same house a year earlier | 94.8% ±1.4 pts | 89.8% |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Census Tract 421 earn?
Half of the 1,943 households in Census Tract 421 earn less than $94,625 a year (±$11,780), against $74,275 across Fond du Lac County: 6th highest of the county's 23 tracts with a reliable estimate. 5.0% of residents live below the poverty line.
| Measure | Tract 421 | Fond du Lac County |
|---|---|---|
| Median household income | $94,625 ±$11,780 | $74,275 |
| Mean household income | $105,439 ±$5,647 | $92,084 |
| Per capita income | $42,679 ±$2,486 | $39,105 |
| People below the poverty line | 5.0% ±1.1 pts | 9.2% |
| Children under 18 below the poverty line | 3.3% ±2.6 pts | 12.5% |
| Households receiving SNAP | 2.4% ±0.9 pts | 9.5% |
| Households with a computer | 96.6% ±1.3 pts | 94.5% |
| Households with a broadband subscription | 90.7% ±4.8 pts | 90.7% |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Census Tract 421?
Owners occupy 92.8% of Census Tract 421's occupied homes and renters 7.2%. The median owner-occupied home is valued at $246,500 by its owner (±$15,515). The median renter pays $795 a month including utilities, and 22.8% of renters pay 35% or more of their income on rent.
| Measure | Tract 421 | Fond du Lac County |
|---|---|---|
| Median home value (owner-occupied) | $246,500 ±$15,515 | $222,800 |
| Median gross rent | $795 ±$132 | $960 |
| Renters paying 35% or more of income on rent | 22.8% ±13.8 pts | 32.3% |
| Median monthly owner costs, with a mortgage | $1,694 ±$96 | $1,502 |
| Owner-occupied homes | 92.8% ±1.9 pts | 70.7% |
| Renter-occupied homes | 7.2% ±1.9 pts | 29.3% |
| Housing units | 2,196 ±189 | 46,094 |
| Single-family detached homes | 91.1% ±2.2 pts | 70.0% |
| Mobile homes | 3.4% ±1.8 pts | 3.7% |
| Built 2020 or later | 0.5% ±0.4 pts | 0.6% |
| Built 2010 to 2019 | 4.8% ±1.7 pts | 7.0% |
| Built 1939 or earlier | 29.4% ±4.0 pts | 25.2% |
| Households with no vehicle | 1.7% ±0.7 pts | 5.6% |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Census Tract 421 get to work?
77.3% of Census Tract 421's workers drive alone and 14.4% work from home. The average trip to work takes 26.0 minutes. The unemployment rate in 2020-2024 averaged 2.3%.
| Measure | Tract 421 | Fond du Lac County |
|---|---|---|
| In the labor force (age 16+) | 60.3% ±4.1 pts | 64.3% |
| Unemployment rate | 2.3% ±1.4 pts | 3.2% |
| Drove alone to work | 77.3% ±3.5 pts | 78.5% |
| Carpooled | 5.1% ±1.5 pts | 8.4% |
| Public transportation | 0.0% ±1.0 pts | 0.1% |
| Walked | 2.7% ±1.1 pts | 2.5% |
| Worked from home | 14.4% ±2.9 pts | 9.0% |
| Mean travel time to work | 26.0 min ±1.3 | 21.2 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
How does Census Tract 421 compare with the other tracts in Fond du Lac County?
Among Fond du Lac County's tracts with a reliable estimate, Census Tract 421 ranks as shown below (1 = highest).
| Measure | In Fond du Lac County |
|---|---|
| Population | 10th of 23 |
| Residents per square mile | 21st of 23 |
| Median household income | 6th of 23 |
| Per capita income | 6th of 23 |
| Median home value | 9th of 23 |
| Median gross rent | 20th of 23 |
| Poverty rate | 18th of 23 |
| Bachelor's degree or higher | 13th of 23 |
| Median age | 4th of 23 |
| Owner-occupied share | 1st of 23 |
The tracts next to it on Fond du Lac County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 419.01 | 3rd | $99,917±$7,880 · within the margin of this tract |
| Tract 417 | 4th | $97,581±$5,586 · within the margin of this tract |
| Tract 414 | 5th | $95,637±$12,932 · within the margin of this tract |
| Tract 421 | 6th | $94,625±$11,780 |
| Tract 419.02 | 7th | $92,500±$15,287 · within the margin of this tract |
| Tract 422 | 8th | $91,509±$6,994 · within the margin of this tract |
| Tract 418 | 9th | $83,533±$12,436 · within the margin of this tract |
"Within the margin": the two incomes differ by less than their combined 90% margins, so the survey cannot say which is higher and the ranks between them are not firm.
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · How ranks are computed
How reliable are the figures for Census Tract 421?
3 of the 18 figures for Census Tract 421 on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
A census tract's figures rest on a few hundred sampled households over five years, so its margins are wider than a city's. Two tracts differ only when the gap between them is larger than their combined 90% margin (the square root of the sum of the two squared margins). How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · Check it at data.census.gov
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections