Rock County, Wisconsin ZIP codes
16 ZIP codes are in Rock County, plus 7 that cross in from neighboring counties. It's part of the Janesville-Beloit, WI metro area.
- ZIP codes
- 16
- Population in these ZIPs
- 170,414
- Avg. median income
- $75,600population-weighted
- Cities & towns
- 12
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Rock County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 53501 | Afton | 165 | — | — |
| 53505 | Avalon | 358 | $91,500 | $392,000 |
| 53511 | Beloit | 48,701 | $67,067 | $219,500 |
| 53512 PO Box | Beloit | — | — | — |
| 53520 | Brodhead | 6,687 | $75,205 | $314,000 |
| 53525 | Clinton | 4,066 | $79,323 | $324,700 |
| 53534 | Edgerton | 12,241 | $89,045 | $353,000 |
| 53536 | Evansville | 9,547 | $87,667 | $388,600 |
| 53537 | Footville | 752 | $59,821 | $258,700 |
| 53542 PO Box | Hanover | — | — | — |
| 53545 | Janesville | 24,703 | $73,889 | $285,500 |
| 53546 | Janesville | 29,867 | $75,825 | $324,000 |
| 53547 PO Box | Janesville | — | — | — |
| 53548 | Janesville | 19,916 | $76,869 | $286,500 |
| 53563 | Milton | 11,280 | $89,528 | $383,100 |
| 53576 | Orfordville | 2,131 | $63,750 | $313,100 |
ZIP codes partly in Rock County
These ZIP codes are mostly in a neighboring county but cover part of Rock County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 53114 | Darien | Walworth County | 1,979 | $72,708 | $333,800 |
| 53190 | Whitewater | Walworth County | 20,499 | $66,069 | $363,600 |
| 53502 | Albany | Green County | 2,393 | $87,000 | $354,500 |
| 53521 | Brooklyn | Green County | 3,640 | $108,036 | $500,400 |
| 53538 | Fort Atkinson | Jefferson County | 18,813 | $82,783 | $329,500 |
| 53585 | Sharon | Walworth County | 2,264 | $74,779 | $304,300 |
| 53589 | Stoughton | Dane County | 19,550 | $96,226 | $433,300 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Rock County
Nearby counties
Frequently asked questions
How many ZIP codes are in Rock County, Wisconsin?
16 ZIP codes are mainly in Rock County, and 7 more ZIP codes from neighboring areas reach partly into it.
What cities are in Rock County?
ZIP codes in Rock County use the city names Afton, Avalon, Beloit, Brodhead, Clinton, Edgerton, Evansville, Footville, Hanover, Janesville, Milton and Orfordville.
What metro area is Rock County in?
Rock County is part of the Janesville-Beloit, WI metropolitan statistical area.