Rock County, WI ZIP codes
There are 16 ZIP codes in Rock County, WI, in 12 towns, from 53501 to 53576. The largest are 53511 (Beloit), 53546 (Janesville) and 53545 (Janesville).
The county seat is Janesville.
- ZIP codes
- 16
- Towns
- 12
- County seat
- Janesville
- County FIPS
55105- State
- Wisconsin
- Population
- 164,350
- Median household income
- $75,673
- Land area
- 718 sq mi
- Area code
- 608
- Metro area
- Janesville-Beloit
Rock County ZIP codes by town
- Janesville (county seat)
- 53545, 53546, 53547, 53548
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
Map of Rock County ZIP codes
The ZIP codes of Rock County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Rock County in numbers
About 164,350 people live in Rock County, in 67,201 households, the 9th most populous of Wisconsin's 72 counties. The median household income is $75,673 a year, about the same as the Wisconsin median of $77,485 (US: $80,734). The median owner-occupied home is valued at $231,600 (13% below the Wisconsin median), and median gross rent is $1,037 a month. The median age is 40.3; 25.8% of adults 25 and over hold a bachelor's degree or higher (33.4% across Wisconsin); the average commute takes 24 minutes.
| Population | 164,350 |
|---|---|
| Households | 67,201 |
| Median age | 40.3 |
| Median household income | $75,673 |
| Median home value | $231,600 |
| Median gross rent | $1,037 |
| Bachelor's degree or higher | 25.8% |
| Mean commute | 23.8 min |
| Population density | 229 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in Rock County
| Town | ZIP codes | Population |
|---|---|---|
| Janesville | 4 | 66,030 |
| Beloit | 2 | 36,534 |
| Edgerton | 1 | 6,014 |
| Evansville | 1 | 5,782 |
| Milton | 1 | 5,706 |
| Brodhead | 1 | 3,197 |
| Clinton | 1 | 2,041 |
| Orfordville | 1 | 1,473 |
| Footville | 1 | 908 |
| Avalon | 1 | 358 |
| Afton | 1 | 165 |
| Hanover | 1 | 130 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with Rock County.
Not sure you are in Rock County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Rock County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
53501 | Afton , WI | Standard | 165 | — | — |
53505 | Avalon , WI | Standard | 358 | $91,500 | $300,000 |
53511 | Beloit , WI | Standard | 48,701 | $67,067 | $173,500 |
53512 | Beloit , WI | No street area | — | — | — |
53520 | Brodhead , WI | Standard | 6,687 | $75,205 | $222,600 |
53525 | Clinton , WI | Standard | 4,066 | $79,323 | $248,100 |
53534 | Edgerton , WI | Standard | 12,241 | $89,045 | $294,900 |
53536 | Evansville , WI | Standard | 9,547 | $87,667 | $304,900 |
53537 | Footville , WI | Standard | 752 | $59,821 | $155,100 |
53542 | Hanover , WI | No street area | — | — | — |
53545 | Janesville , WI | Standard | 24,703 | $73,889 | $220,700 |
53546 | Janesville , WI | Standard | 29,867 | $75,825 | $239,400 |
53547 | Janesville , WI | No street area | — | — | — |
53548 | Janesville , WI | Standard | 19,916 | $76,869 | $234,900 |
53563 | Milton , WI | Standard | 11,280 | $89,528 | $293,800 |
53576 | Orfordville , WI | Standard | 2,131 | $63,750 | $225,000 |
Cite this page
zipcodes.pro. “Rock County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/wi/county/rock
Underlying data is public domain or openly licensed — sources, vintages and licences.