County ProfileWI
Rock County
Population: 163,687 · 15 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
163,687
People
Median age
40.3
Housing
Total households
67,201
Income
Median household income
$75,673
Housing
Total housing units
71,109
Employment
Employment rate
62.7%
Education
Bachelor’s degree or higher
25.8%
Healthcare
Insured population
94.5%
County details
Local time 02:17:36(CT)| Name | Rock |
|---|---|
| Total ZIP codes | 15total |
| ZIP codes (by type) | 10 Standard5 PO Box |
| Area code | 262, 608 |
| Timezone | Central Time (CT) |
| Coordinates | 42.6698802, -89.0752844 |
| Land area | 718.2 sq miles(1,860 km²) |
Map of Rock county, Wisconsin with ZIP codes
Cities and Communities in Rock County
Compare the largest cities in Rock County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.
| City | Population | Median incomeHousehold | ZIP codes |
|---|---|---|---|
| Janesville | 65,615 | $73,446 | 4ZIPs |
| Beloit | 36,657 | $62,663 | 2ZIPs |
| Edgerton | 5,945 | $72,489 | 1ZIPs |
| Milton | 5,716 | $85,959 | 1ZIPs |
| Evansville | 5,703 | $81,149 | 1ZIPs |
| Clinton | 2,221 | $72,019 | 1ZIPs |
| Orfordville | 1,473 | $65,417 | 1ZIPs |
| Footville | 772 | $68,571 | 1ZIPs |
| Avalon | 398 | — | 1ZIPs |
| Hanover | 179 | $60,972 | 1ZIPs |
| Afton | 144 | — | 1ZIPs |
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in Rock County
Review the most populated postal areas across Rock County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
| ZIP | City | Median incomeHousehold | Population (ZIP) |
|---|---|---|---|
| 53511 | Beloit | $67,067 | 48,659 |
| 53546 | Janesville | $75,825 | 31,190 |
| 53545 | Janesville | $73,889 | 23,318 |
| 53548 | Janesville | $76,869 | 19,233 |
| 53534 | Edgerton | $89,045 | 12,752 |
| 53563 | Milton | $89,528 | 11,503 |
| 53536 | Evansville | $87,667 | 9,051 |
| 53525 | Clinton | $79,323 | 4,028 |
| 53576 | Orfordville | $63,750 | 2,284 |
| 53537 | Footville | $59,821 | 707 |
| 53505 | Avalon | $91,500 | 398 |
| 53501 | Afton | — | 144 |
| 53512 | Beloit | — | — |
| 53542 | Hanover | — | — |
| 53547 | Janesville | — | — |
Data Sources & Citations
The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:
- United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
- United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS