Rock County, WI ZIP Codes

Wisconsin (WI)  ·  15 ZIP codes  ·  11 cities
15
ZIP codes
164,381
population (2021)
+2.5%
pop change since 2010
55105
FIPS code
Rock County ZIP code map
About Rock County
Rock County is located in Wisconsin and contains 15 ZIP codes across 11 cities and communities. The county's population was 164,381 as of 2021, an increase of 2.5% from 160,331 in 2010. The timezone is Mountain Time (observes DST). The Federal Information Processing System (FIPS) code for Rock County is 55105.
Population
2021 population164,381
2010 population160,331
Change+2.5%
County details
StateWisconsin
FIPS code55105
TimezoneMountain
Daylight savingYes
Cities in Rock County
Afton Avalon Beloit Clinton Edgerton Evansville Footville Hanover Janesville Milton Orfordville
ZIP codes for Rock County, WI (15)
ZIP code City County Map
53501 Afton Rock View map
53505 Avalon Rock View map
53511 Beloit Rock View map
53512 Beloit Rock View map
53525 Clinton Rock View map
53534 Edgerton Rock View map
53536 Evansville Rock View map
53537 Footville Rock View map
53542 Hanover Rock View map
53545 Janesville Rock View map
53546 Janesville Rock View map
53547 Janesville Rock View map
53548 Janesville Rock View map
53563 Milton Rock View map
53576 Orfordville Rock View map

Demographics & statistics

161,974
Population
39.9
Median age
$70,544
Median household income
$35,617
Per capita income
$214,350
Median home value
$944
Median monthly rent
74.1%
Home ownership
7.5%
Poverty rate
3.5%
Unemployment
49,780
Housing units
25.4%
Bachelor's or higher

Age distribution

Male Female
4,789
Under 5
4,544
5,128
5–9
4,864
5,541
10–14
5,257
5,618
15–19
5,330
5,191
20–24
4,924
10,118
25–34
9,599
10,479
35–44
9,942
10,490
45–54
9,952
5,918
55–59
5,615
5,847
60–64
5,546
8,380
65–74
7,950
3,954
75–84
3,752
1,666
85+
1,580
← Male
Female →

Age summary

GroupCount%
Under 1836,86922.1%
18 and over125,10577.9%
65 and over27,28217.0%
Median age39.9 years

Race & ethnicity

White 77.5%
Hispanic or Latino 7.1%
Two or more races 6.4%
Black or African American 4.4%
Other race 3.4%
Asian 1.1%
American Indian / Alaska Native 0.1%
GroupCount%
White135,09977.5%
Hispanic or Latino12,3567.1%
Two or more races11,2046.4%
Black or African American7,6084.4%
Other race5,9183.4%
Asian1,8851.1%
American Indian / Alaska Native2500.1%

Household income

Under $10k 3.0%
$10k–$15k 2.6%
$15k–$25k 6.0%
$25k–$35k 7.5%
$35k–$50k 10.3%
$50k–$75k 19.1%
$75k–$100k 16.1%
$100k–$150k 19.4%
$150k–$200k 8.6%
$200k+ 7.6%
Range% of households
Under $10k3.0%
$10k–$15k2.6%
$15k–$25k6.0%
$25k–$35k7.5%
$35k–$50k10.3%
$50k–$75k19.1%
$75k–$100k16.1%
$100k–$150k19.4%
$150k–$200k8.6%
$200k+7.6%
Median income$70,544

Housing

Home values

Under $50k 3.5%
$50k–$100k 6.6%
$100k–$150k 14.9%
$150k–$200k 20.0%
$200k–$300k 32.1%
$300k–$500k 17.1%
$500k–$1M 5.1%
$1M+ 0.8%

Housing overview

MetricValue
Median home value$214,350
Median rent / month$944
Owner occupied74.1%
Renter occupied25.9%
Vacant6.1%
Single-family detached77.2%
Large apartment buildings3.7%
Mobile homes2.3%
Median rooms6.1
Avg household size (owned)2.51

Year built

Era%
2020 or later0.3%
2010–20194.1%
2000–200910.1%
1990–199912.4%
1980–19896.6%
1970–197913.1%
1960–196912.0%
1950–19598.3%
1940–19498.5%
1939 or earlier24.6%

Bedrooms

Size% of units
No bedroom (studio)0.9%
1 bedroom6.5%
2 bedrooms23.5%
3 bedrooms48.1%
4 bedrooms16.3%
5+ bedrooms4.6%

Vehicles per household

Vehicles% of households
No vehicle3.9%
1 vehicle27.4%
2 vehicles39.1%
3 or more29.6%

Heating fuel

Fuel type%
Utility gas63.2%
Electricity15.6%
Propane / LP gas16.4%
Fuel oil1.6%
Wood2.1%
No fuel used0.4%

Households & families

Household typeCount%
Married-couple family30,84851.2%
Cohabiting couple5,6507.9%
Male householder, no spouse11,87117.6%
Female householder, no spouse17,15423.4%
Households with children under 1818,73228.6%
Households with seniors (65+)19,83830.3%
Average household size2.41

Marital status

StatusMaleFemale
Never married33.2%25.9%
Married52.7%51.4%
Separated0.8%1.5%
Widowed2.4%9.0%
Divorced10.9%12.3%

Education

Less than 9th grade 1.7%
Some HS, no diploma 5.7%
HS graduate 32.7%
Some college, no degree 22.3%
Associate's degree 12.3%
Bachelor's degree 17.6%
Graduate / professional 7.8%
Metric%
HS diploma or higher92.7%
Bachelor's or higher25.4%

School enrollment (ages 3–17)

TypeCount%
Nursery / preschool2,0365.4%
Kindergarten1,8254.0%
Elementary school16,31645.8%
High school9,08026.2%
College / grad school8,75818.6%

Employment

Industry of employment

Education & healthcare 21.1%
Manufacturing 19.5%
Retail trade 11.4%
Construction 9.4%
Professional & management 6.5%
Arts, food & hospitality 6.3%
Transportation & utilities 5.0%
Other services 4.7%
Finance & real estate 4.3%
Wholesale trade 4.2%
Public administration 3.3%
Agriculture & mining 3.1%
Information 1.4%

Occupation

Category%
Management, business & arts33.7%
Service13.5%
Sales & office19.3%
Natural resources & construction13.1%
Production & transportation20.4%

Employment type

Type%
Private sector82.4%
Government11.4%
Self-employed6.0%
Unpaid family workers0.2%

Commute

Method%
Drive alone82.0%
Carpool6.5%
Public transit0.4%
Walk1.6%
Other means1.1%
Avg commute (minutes)24.4

Poverty

All people 7.5%
Under 18 years 10.3%
18 and over 6.7%
Married-couple families 2.7%
Female-led households 17.3%

Income support

Source% of households
Social Security32.9%
Retirement income28.7%
Supplemental Security4.2%
Cash public assistance2.0%
Food stamps / SNAP10.4%

Health indicators

Condition%
High blood pressure29.8%
High cholesterol32.0%
Heart disease5.8%
Stroke2.8%
Asthma9.9%
Arthritis23.3%
Kidney disease2.7%
Pulmonary disease6.1%
Cancer6.6%
Behavior / access%
Binge drinking23.2%
No physical activity21.1%
Less than 7 hrs sleep30.4%
Fair or poor health12.0%
Poor mental health13.6%
Poor physical health9.8%
No health insurance10.9%
Visited doctor (checkup)71.2%
Visited dentist70.0%
Cholesterol screening87.1%
Teeth loss11.9%

Veterans & disability

VeteransCount%
Civilian veterans9,1028.4%
Disability%
Any disability11.8%
Under 184.9%
18–64 years8.5%
65 and over32.8%

Health insurance coverage

Type%
Private insurance80.5%
Public insurance33.0%
Uninsured under 192.4%

Language & origin

Language spoken at home (age 5+)

LanguageCount%
English only152,64194.8%
Spanish4,4922.0%
Other Indo-European3,8071.6%
Asian & Pacific Islander3400.3%
Other languages3030.1%

Place of birth & citizenship

OriginCount%
Native born (US)154,03696.8%
Born in same state153,24296.4%
Born in different state113,74773.8%
Foreign born7940.4%
Naturalized citizen7,9383.3%
Not a US citizen3,40944.2%

Ancestry

AncestryCount%
Italian21,32113.2%
Polish18,16111.2%
French14,8909.2%
Arab5,6833.5%
English2,5321.6%
AncestryCount%
Dutch1,0160.6%
German5360.3%
Irish4240.3%
Norwegian3460.2%

Technology access

Metric% of households
Computer access41.1%
Internet access93.4%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

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