ZIP code 53548: Janesville, WI
ZIP code 53548 is in Janesville (81% of residents), in Rock County, Wisconsin. 19% of its residents live outside city limits. It is in Wisconsin's 1st congressional district (87%) and Wisconsin's 2nd congressional district (13%). Its state senate district is State Senate District 15; its state house districts are Assembly District 44 (100%), Assembly District 43 (0.2%) and Assembly District 45 (<0.1%).
See it on the mapAll of Wisconsin
City and county
| City or town | Share of ZIP residents |
|---|---|
| Janesville | 81% |
| Footville | 0.3% |
| County | Share of ZIP residents |
|---|---|
| Rock County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Janesville city | 81% |
| Janesville town | 9.1% |
| Rock town | 3.4% |
| Center town | 3.3% |
| Plymouth town | 2.1% |
| Porter town | 0.6% |
| Footville village | 0.3% |
| Fulton town | 0.2% |
| Magnolia town | <0.1% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Wisconsin's 1st congressional district (WI-01) | 87% |
| Wisconsin's 2nd congressional district (WI-02) | 13% |
This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| Mayor | Janesville City Council | 608-373-6015 | 81% |
| U.S. Representative (WI-01) | Bryan Steil (R) | 202-225-3031 | 87% |
| U.S. Representative (WI-02) | Mark Pocan (D) | 202-225-2906 | 13% |
| U.S. Senator | Ron Johnson (R) | 202-224-5323 · contact form | statewide |
| U.S. Senator | Tammy Baldwin (D) | 202-224-5653 · contact form | statewide |
| State Senator (State Senate District 15) | Mark Spreitzer (Democratic) | 100% | |
| Assembly Member (Assembly District 44) | Ann Roe (Democratic) | 100% | |
| Assembly Member (Assembly District 43) | Brienne Brown (Democratic) | 0.2% | |
| Assembly Member (Assembly District 45) | Clint Anderson (Democratic) | <0.1% |
Officials serving now (members of Congress until January 3, 2027). Sources: Mayors: Open States (public domain); State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Janesville laws: search for the Janesville, Wisconsin code of ordinances
- Rock County website: https://www.co.rock.wi.us/
- Rock County laws: search for the Rock County, Wisconsin code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 15 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| Assembly District 44 | 100% |
| Assembly District 43 | 0.2% |
| Assembly District 45 | <0.1% |
Voting precincts
26 voting precincts overlap ZIP 53548. Map them, with each precinct's share of the ZIP's residents.
Get this in your AI agent
Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:53548")
ZIP 53548 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.