COUNTY · 1990 CENSUS
Rock County
Wisconsin · 139,510 residents · 718.167 sq mi
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Part of the Janesville metro area
The short version
Rock County has roughly average household income, with a median household income of $30,632. Population has declined 8% since 2000. Median home value is $52,500.
At a glance
Average income
near the US median
US median: $30,130
Mid-age
median age 33.0
US median: 33.0
Less educated
13% hold a bachelor's degree
US average: 20%
More affordable
home values down 30%, inflation adjusted
US median home: $93,722
Section 01
Population & growth
Population, 1990 – 2024
2024164K
Age distribution, 1990
Under 57.7%(10,803)
5 to 97.4%(10,388)
10 to 147.7%(10,715)
15 to 197.1%(9,882)
20 to 246.9%(9,650)
25 to 3416.4%(22,947)
35 to 4414.4%(20,029)
45 to 5410.9%(15,191)
55 to 648.8%(12,285)
65 to 747%(9,797)
75 to 844.2%(5,926)
85 and over1.4%(1,897)
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02
Income & economy
$30,632
−11%inflation adjusted, since 2000
vs $45,517 in 2000
US average: $30,130
1990 – 2024
Section 03
Housing
$52,500
−30%inflation adjusted, since 2000
vs $98,300 in 2000
US average: $93,722
1990 – 2024
RELATED:See current rent listings in Rock County on RentDataNow
Section 04
Race & ethnicity
2000
White, non-Hispanic89.2%(135,884)
Black4.6%(6,943)
Hispanic / Latino3.9%(5,953)
Asian0.8%(1,180)
Other0%
1990
White, non-Hispanic93.8%(130,827)
Black4.7%(6,537)
Hispanic / Latino1.2%(1,704)
Asian0.6%(906)
Other0.9%(1,240)
No data for the years selected.
Section 04 · Origins
Detailed origins & ancestry
Detailed origin tables are available for 2024; showing 2024 data.
Hispanic origin
Mexican8.3%(13,597)
Puerto Rican0.5%(820)
South American0.3%(557)
Dominican0.3%(445)
Central American0.2%(310)
Colombian0.2%(261)
Argentine0.1%(203)
Salvadoran0.1%(116)
Spaniard0.1%(104)
Guatemalan0.1%(95)
Cuban0%(55)
Honduran0%(49)
+ 7 more hispanic origin groups with data
Uruguayan0%(30)
Panamanian0%(28)
Costa Rican0%(22)
Peruvian0%(22)
Venezuelan0%(20)
Ecuadorian0%(18)
Bolivian0%(3)
Asian origin
Cambodian0.2%(292)
Chinese0.2%(259)
Hmong0.1%(243)
Filipino0.1%(237)
Vietnamese0.1%(219)
Korean0.1%(177)
Asian Indian0.1%(130)
Laotian0%(77)
Thai0%(27)
Japanese0%(20)
Pakistani0%(18)
Singaporean0%(10)
+ 1 more asian origin group with data
Nepalese0%(4)
Ancestry
German31.6%(51,874)
Irish13%(21,418)
English9.9%(16,341)
Norwegian9.9%(16,241)
American5.5%(9,045)
Polish3.3%(5,432)
Italian2.9%(4,798)
Swiss1.9%(3,070)
French1.8%(2,985)
Swedish1.8%(2,925)
Dutch1.2%(2,020)
Scottish1.2%(2,017)
+ 39 more ancestry groups with data
Czech0.7%(1,209)
Danish0.6%(1,061)
Scotch-Irish0.4%(739)
Russian0.4%(715)
French Canadian0.4%(669)
Welsh0.4%(601)
Subsaharan African0.4%(586)
Austrian0.3%(478)
Finnish0.2%(402)
British0.2%(342)
Lithuanian0.2%(315)
Slovak0.2%(303)
Greek0.2%(268)
Belgian0.2%(260)
Armenian0.1%(220)
Croatian0.1%(197)
Ukrainian0.1%(191)
Portuguese0.1%(162)
Hungarian0.1%(154)
West Indian0.1%(117)
Arab0.1%(104)
Canadian0.1%(92)
Jamaican0.1%(88)
Romanian0%(60)
Lebanese0%(55)
Ghanaian0%(45)
Slovene0%(37)
Haitian0%(29)
Egyptian0%(23)
Serbian0%(22)
Latvian0%(20)
Turkish0%(19)
Nigerian0%(18)
Iranian0%(14)
Macedonian0%(13)
Moroccan0%(9)
Ethiopian0%(4)
Australian0%(3)
Guyanese0%(2)
Section 05
Education
High school or higher
78.2%
−5.7 ptsvs 2000
vs 83.9% in 2000
US average: 75.2%
Section 06
Commute & transportation
Section 07
Work & employment
No data for the years selected.
Section 08
People & community
No data for the years selected.
Marital status (2024)
Men 15+
Never married34.9%(23,103)
Married50.8%(33,683)
Widowed3.1%(2,022)
Divorced11.2%(7,438)
Women 15+
Never married28.6%(19,487)
Married50.2%(34,197)
Widowed8.6%(5,870)
Divorced12.6%(8,615)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
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Compare Rock County to nearby counties
ROCK COUNTY VS
Winnebago County
Income$65,837+115%
Home value$164,500+213%
Population283,674+70%
SEE FULL COMPARISON →
ROCK COUNTY VS
Green County
Income$82,852+170%
Home value$250,200+377%
Population37,227−78%
SEE FULL COMPARISON →
ROCK COUNTY VS
Walworth County
Income$80,520+163%
Home value$302,700+477%
Population106,127−36%
SEE FULL COMPARISON →
ROCK COUNTY VS
Boone County
Income$84,571+176%
Home value$216,900+313%
Population53,568−68%
SEE FULL COMPARISON →
Frequently asked
How many people live in Rock County, Wisconsin?
Rock County, Wisconsin has about 139,510 residents according to the 1990 Census.
What is the median household income in Rock County, Wisconsin?
The typical household in Rock County, Wisconsin earns about $30,632 a year. Half of households make more than that, and half make less.
Is Rock County, Wisconsin expensive?
In Rock County, Wisconsin, the median home is worth about $52,500, and the typical rent is about $387 a month.
How educated are people in Rock County, Wisconsin?
About 13.3% of adults age 25 and over in Rock County, Wisconsin hold a bachelor's degree or higher.
What is the poverty rate in Rock County, Wisconsin?
About 9.9% of people in Rock County, Wisconsin live below the federal poverty line.
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41 census tracts (top 20 by population)
Census Tract 12.01Census Tract 13.02Census Tract 12.02Census Tract 14Census Tract 30.02Census Tract 16Census Tract 30.01Census Tract 29.02Census Tract 13.06Census Tract 31.02Census Tract 26.01Census Tract 17Census Tract 11Census Tract 28Census Tract 13.03Census Tract 5Census Tract 26.02Census Tract 18Census Tract 8Census Tract 713 ZIP codes
ZIP 53511ZIP 53546ZIP 53545ZIP 53548ZIP 53534ZIP 53563ZIP 53536ZIP 53520ZIP 53525ZIP 53576ZIP 53537ZIP 53505ZIP 53501Up the hierarchy
All counties in WisconsinDATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024