ZIP code 53561: Merrimac, WI
ZIP code 53561 is in Merrimac (26% of residents) and Lake Wisconsin (7.3%), in Sauk County (85%) and Columbia County (15%), Wisconsin. 67% of its residents live outside city limits. It is in Wisconsin's 2nd congressional district (85%) and Wisconsin's 6th congressional district (15%). Its state senate district is State Senate District 14; its state house district is Assembly District 40.
See it on the mapAll of Wisconsin
City and county
| City or town | Share of ZIP residents |
|---|---|
| Merrimac | 26% |
| Lake Wisconsin | 7.3% |
| County | Share of ZIP residents |
|---|---|
| Sauk County | 85% |
| Columbia County | 15% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Merrimac town | 59% |
| Merrimac village | 26% |
| Caledonia town | 15% |
| Sumpter town | land only |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Wisconsin's 2nd congressional district (WI-02) | 85% |
| Wisconsin's 6th congressional district (WI-06) | 15% |
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-02) | Mark Pocan (D) | 202-225-2906 | 85% |
| U.S. Representative (WI-06) | Glenn Grothman (R) | 202-225-2476 | 15% |
| 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 14) | Sarah Keyeski (Democratic) | 100% | |
| Assembly Member (Assembly District 40) | Karen DeSanto (Democratic) | 100% |
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
- Merrimac website: https://merrimacwi.gov
- Merrimac laws: search for the Merrimac, Wisconsin code of ordinances
- Lake Wisconsin laws: search for the Lake Wisconsin, Wisconsin code of ordinances
- Sauk County website: http://www.co.sauk.wi.us
- Sauk County laws: search for the Sauk County, Wisconsin code of ordinances
- Columbia County laws: search for the Columbia County, Wisconsin code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 14 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| Assembly District 40 | 100% |
Voting precincts
5 voting precincts overlap ZIP 53561. 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:53561")
ZIP 53561 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.