Census tract · Rock County
Census Tract 13.05, Rock County, Wisconsin
Census Tract 13.05, GEOID 55105001305, in Rock County, Wisconsin, mostly within Janesville (92% of its census blocks). 3,923 residents in the ACS 2020-2024 5-year estimates (±495); the 2020 Census counted 3,560.
Residents, 2020-2024
3,923
±495 (90% margin)
2020 Census count: 3,560
Median household income
$104,306
±$8,175 (90% margin)
Rock County: $75,673
Median home value
$330,200
±$21,694 (90% margin)
Rock County: $231,600
Median gross rent
$1,693
±$365 (90% margin)
Rock County: $1,037
Where is Census Tract 13.05?
Census Tract 13.05 is one of 41 census tracts in Rock County, Wisconsin. It covers 1.96 square miles of land, 1,819 residents per square mile in 2020. Its GEOID, 55105001305, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Janesville | 92% |
| Harmony (town), Rock County | 8% |
3 census tracts border Census Tract 13.05: Tract 7 ($62,436), Tract 13.03 ($124,925) and Tract 13.06 ($54,574). 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 13.05?
The 2020-2024 American Community Survey puts Census Tract 13.05's population at 3,923 (±495) in 1,349 households; the 2020 Census counted 3,560 residents and 1,336 housing units.
| Measure | Tract 13.05 | Janesville |
|---|---|---|
| Total population | 3,923 ±495 | 66,030 |
| Households | 1,349 ±164 | 28,326 |
| Average household size | 2.86 ±0.25 | 2.30 |
| Housing units | 1,395 ±149 | 29,330 |
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 13.05?
The median resident of Census Tract 13.05 is 41.0 years old; 26.9% are under 18 and 19.7% are 65 or older. The largest group is non-Hispanic white residents at 89.7%, then Hispanic or Latino residents (of any race) at 7.5%.
| Measure | Tract 13.05 | Janesville |
|---|---|---|
| Median age | 41.0 ±5.3 | 40.7 |
| Under 18 years | 26.9% ±5.6 pts | 21.2% |
| 65 years and over | 19.7% ±7.1 pts | 18.2% |
| Hispanic or Latino (any race) | 7.5% ±6.8 pts | 7.8% |
| White alone, not Hispanic | 89.7% ±6.9 pts | 83.8% |
| Black or African American alone, not Hispanic | 0.7% ±0.7 pts | 3.0% |
| Asian alone, not Hispanic | 0.0% ±0.6 pts | 1.6% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.6 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.6 pts | 0.0% |
| Two or more races, not Hispanic | 1.8% ±1.3 pts | 3.5% |
| Some other race alone, not Hispanic | 0.4% ±0.5 pts | 0.3% |
| Born outside the United States | 3.4% ±2.4 pts | 3.8% |
| Speak a language other than English at home (age 5+) | 6.1% ±6.1 pts | 7.5% |
| Civilian veterans (age 18+) | 9.4% ±3.6 pts | 6.7% |
| With a disability | 10.5% ±4.5 pts | 13.0% |
| No health insurance coverage | 0.6% ±0.9 pts | 5.6% |
| High school graduate or higher (age 25+) | 95.6% ±3.8 pts | 94.4% |
| Bachelor's degree or higher (age 25+) | 39.3% ±7.6 pts | 27.3% |
| Graduate or professional degree (age 25+) | 14.2% ±8.6 pts | 8.5% |
| Lived in the same house a year earlier | 93.9% ±3.6 pts | 90.7% |
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 13.05 earn?
Half of the 1,349 households in Census Tract 13.05 earn less than $104,306 a year (±$8,175), against $75,673 across Rock County: 3rd highest of the county's 41 tracts with a reliable estimate. 3.2% of residents live below the poverty line.
| Measure | Tract 13.05 | Janesville |
|---|---|---|
| Median household income | $104,306 ±$8,175 | $73,446 |
| Mean household income | $113,450 ±$9,670 | $85,681 |
| Per capita income | $41,834 ±$5,207 | $37,762 |
| People below the poverty line | 3.2% ±2.0 pts | 9.0% |
| Children under 18 below the poverty line | 0.9% ±1.6 pts | 11.7% |
| Households receiving SNAP | 3.6% ±3.0 pts | 12.8% |
| Households with a computer | 98.9% ±1.4 pts | 96.5% |
| Households with a broadband subscription | 99.3% ±1.3 pts | 91.3% |
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 13.05?
Owners occupy 92.5% of Census Tract 13.05's occupied homes and renters 7.5%. The median owner-occupied home is valued at $330,200 by its owner (±$21,694). The median renter pays $1,693 a month including utilities.
| Measure | Tract 13.05 | Janesville |
|---|---|---|
| Median home value (owner-occupied) | $330,200 ±$21,694 | $223,400 |
| Median gross rent | $1,693 ±$365 | $1,054 |
| Renters paying 35% or more of income on rent | 16.5% ±20.8 pts | 34.4% |
| Median monthly owner costs, with a mortgage | $1,852 ±$98 | $1,510 |
| Owner-occupied homes | 92.5% ±4.2 pts | 67.3% |
| Renter-occupied homes | 7.5% ±4.2 pts | 32.7% |
| Housing units | 1,395 ±149 | 29,330 |
| Single-family detached homes | 84.2% ±6.4 pts | 67.8% |
| Mobile homes | 0.0% ±1.6 pts | 2.1% |
| Built 2020 or later | 6.7% ±4.6 pts | 1.3% |
| Built 2010 to 2019 | 14.2% ±5.3 pts | 3.8% |
| Built 1939 or earlier | 4.4% ±5.4 pts | 14.2% |
| Households with no vehicle | 4.1% ±4.4 pts | 5.9% |
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 13.05 get to work?
78.4% of Census Tract 13.05's workers drive alone and 5.0% work from home. The average trip to work takes 23.5 minutes.
| Measure | Tract 13.05 | Janesville |
|---|---|---|
| In the labor force (age 16+) | 63.6% ±8.7 pts | 65.5% |
| Unemployment rate | 0.8% ±1.0 pts | 4.1% |
| Drove alone to work | 78.4% ±7.1 pts | 80.0% |
| Carpooled | 13.2% ±6.0 pts | 7.3% |
| Public transportation | 0.4% ±1.2 pts | 0.6% |
| Walked | 3.0% ±3.8 pts | 1.4% |
| Worked from home | 5.0% ±3.2 pts | 9.5% |
| Mean travel time to work | 23.5 min ±4.5 | 21.9 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 13.05 compare with the other tracts in Rock County?
Among Rock County's tracts with a reliable estimate, Census Tract 13.05 ranks as shown below (1 = highest).
| Measure | In Rock County | In Janesville |
|---|---|---|
| Population | 22nd of 41 | 12th of 18 |
| Residents per square mile | 20th of 41 | 12th of 18 |
| Median household income | 3rd of 41 | 2nd of 18 |
| Per capita income | 17th of 41 | 7th of 18 |
| Median home value | 4th of 41 | 3rd of 18 |
| Median gross rent | 1st of 41 | 1st of 18 |
| Poverty rate | 32nd of 35 | 15th of 16 |
| Bachelor's degree or higher | 3rd of 39 | 3rd of 17 |
| Median age | 20th of 41 | 10th of 18 |
| Owner-occupied share | 3rd of 41 | 2nd of 18 |
The tracts next to it on Rock County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 13.03 | 1st | $124,925±$8,277 |
| Tract 30.02 | 2nd | $110,724±$22,360 · within the margin of this tract |
| Tract 13.05 | 3rd | $104,306±$8,175 |
| Tract 26.02 | 4th | $92,750±$9,635 · within the margin of this tract |
| Tract 27 | 5th | $92,391±$4,254 |
| Tract 9 | 6th | $91,175±$1,974 |
"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 13.05?
3 of the 18 figures for Census Tract 13.05 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