ZIP code 53563: Milton, WI
ZIP code 53563 is in Milton (50% of residents) and Janesville (12%), in Rock County (99%) and Jefferson County (1.0%), Wisconsin. 38% of its residents live outside city limits. It is in Wisconsin's 1st congressional district (99%), Wisconsin's 5th congressional district (1.0%) and Wisconsin's 2nd congressional district (0.5%). Its state senate districts are State Senate District 15 (99%) and State Senate District 16 (1.0%); its state house districts are Assembly District 43 (93%), Assembly District 44 (5.6%) and Assembly District 46 (1.0%).
See it on the mapAll of Wisconsin
City and county
| City or town | Share of ZIP residents |
|---|---|
| Milton | 50% |
| Janesville | 12% |
| Lake Koshkonong | 1.0% |
| County | Share of ZIP residents |
|---|---|
| Rock County | 99% |
| Jefferson County | 1.0% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Milton city | 50% |
| Milton town | 16% |
| Harmony town | 15% |
| Janesville city | 12% |
| Lima town | 2.7% |
| Johnstown town | 1.6% |
| Koshkonong town | 1.0% |
| Janesville town | 0.5% |
| Fulton town | 0.5% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Wisconsin's 1st congressional district (WI-01) | 99% |
| Wisconsin's 5th congressional district (WI-05) | 1.0% |
| Wisconsin's 2nd congressional district (WI-02) | 0.5% |
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 |
|---|---|---|---|
| U.S. Representative (WI-01) | Bryan Steil (R) | 202-225-3031 | 99% |
| U.S. Representative (WI-05) | Scott Fitzgerald (R) | 202-225-5101 | 1.0% |
| U.S. Representative (WI-02) | Mark Pocan (D) | 202-225-2906 | 0.5% |
| 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) | 99% | |
| State Senator (State Senate District 16) | Melissa Ratcliff (Democratic) | 1.0% | |
| Assembly Member (Assembly District 43) | Brienne Brown (Democratic) | 93% | |
| Assembly Member (Assembly District 44) | Ann Roe (Democratic) | 5.6% | |
| Assembly Member (Assembly District 46) | Joan Fitzgerald (Democratic) | 1.0% |
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Milton laws: search for the Milton, Wisconsin code of ordinances
- 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
- Jefferson County website: https://www.jeffersoncountywi.gov/
- Jefferson County laws: search for the Jefferson County, Wisconsin code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 15 | 99% |
| State Senate District 16 | 1.0% |
| State house district | Share of ZIP residents |
|---|---|
| Assembly District 43 | 93% |
| Assembly District 44 | 5.6% |
| Assembly District 46 | 1.0% |
Voting precincts
25 voting precincts overlap ZIP 53563. 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:53563")
ZIP 53563 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.