In which county is ZIP code 53545 located?

ZIP 53545 is listed under Rock County, WI.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 53545: Janesville, WI

ZIP: 53545

County: Rock County

Coordinates: 42.73550, -89.04050

ZIP Type: Standard

Time Zone: Central Time (CT)

Explore detailed information for ZIP code 53545 in Janesville, WI. We include verified county details for Rock County plus key geographic references used for mapping and logistics.

Primary City	Janesville
ZIP Code	53545
County	Rock County
State	WI
Latitude / Longitude	42.73550, -89.04050
ZIP Type	Standard
Time Zone	Central Time (CT)
Data Updated	2026-01-08

Maps & Useful Links

Open in Maps: Google Maps · OpenStreetMap

These links show the approximate center point for ZIP 53545 (not an exact boundary).

Geographic & Administrative Context

For mapping and verification, 53545 is commonly represented around 42.73550, -89.04050. These coordinates help identify the general area within Rock County, WI.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 53545 for mail delivery and general location reference in Rock County, WI.

Coverage may include nearby neighborhoods and adjacent unincorporated areas commonly associated with Janesville.

Related ZIP Codes (Nearby)

Explore other postal codes near Janesville within WI.

Frequently Asked Questions

What is the primary city for ZIP code 53545?

The primary city for this ZIP code is Janesville, located in WI.

In which county is 53545 located?

ZIP code 53545 is situated within Rock County, WI.

What are the coordinates for 53545?

The approximate center point is 42.73550 (Latitude) and -89.04050 (Longitude).

Is ZIP code 53545 active?

This page lists ZIP 53545 as Listed based on the latest refresh date shown above.

Does ZIP 53545 cover multiple areas?

Yes. Many ZIP codes cover multiple neighborhoods or nearby areas. For exact boundaries, use official mapping tools.

Methodology & Data Notes

How we build this page: We generate this page from a structured ZIP dataset and refresh key fields (city, county, and coordinates) during scheduled updates. Coordinates represent an approximate center point, not an official boundary map.
Sources: Public ZIP reference datasets and geographic coordinate references. If you use specific sources (e.g., USPS, Census), list them on your About/Methodology page.

Page updated: 2026-01-08