Plain

City ZIP codes · Wisconsin

Janesville, WI ZIP Codes

4 ZIP codes use the postal name Janesville, Wisconsin (Census 2020 ZCTAs and GeoNames postal codes, October 2026): 3 residential and 1 for PO boxes or a single organization. Median household income runs from $73,889 in 53545 to $76,869 in 53548 (Census Bureau, ACS 2020-2024). Janesville's most populous ZIP code is 53546, with 29,867 people (ACS 2020-2024); 20% of its land is in the city of Janesville.

  • ACS2020-24
  • Census2020
  • GeoNames2026

Where are Janesville's ZIP codes?

53545: $74k median household income53546: $76k median household income53548: $77k median household income53548535465354553545: $74k median household income53546: $76k median household income53548: $77k median household income53548535465354553545: $74k median household income53546: $76k median household income53548: $77k median household income535485354653545
The 3 residential ZIP codes named Janesville, shaded by median household income in national fifths (ACS 2020-2024). Select a ZIP to open it. <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are Janesville's ZIP codes?

The highest median household income is in 53548 ($76,869), the lowest in 53545 ($73,889). Home values run from $220,700 in 53545 to $239,400 in 53546.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013, B25077, B01003).

All 3 residential ZIP codes of Janesville

Residential ZIP codes with the postal name Janesville, WI, largest first (ACS 2020-2024); sort by any column
County
53546 Rock County 29,867 368 $76k $239k
53545 Rock County 24,703 1,098 $74k $221k
53548 Rock County 19,916 266 $77k $235k

Download the 4 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; 2023 Gazetteer land areas (2020 ZCTAs); town names from simplemaps US ZIP Codes (CC BY 4.0) and GeoNames (CC BY 4.0).

PO Box and single-organization ZIP codes in Janesville

1 ZIP code named Janesville has no residential delivery area: post office boxes, or one organization (a large employer, an agency, a university) with its own code. The Census Bureau publishes no figures for them.

Janesville, WI: ZIP codes without a residential area, for PO boxes or one organization (GeoNames postal codes; USPS does not publish openly which is which)
ZIPCounty
53547Rock County

Source: GeoNames postal codes (CC BY 4.0); a ZIP code with no Census ZCTA has no residential delivery area.

Which counties do Janesville's ZIP codes reach?

Janesville's residential ZIP codes lie in Rock County.

Which first three digits do Janesville's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Janesville starts with 535.

Three-digit prefixes of Janesville's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Janesville's
PrefixSectional centerHereAll codes
535 Madison, WI (SCF 535) 4 87

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.