Jefferson, Wisconsin
Jefferson is a city in Jefferson County, Wisconsin, with 7,794 residents in 2020. It is in Wisconsin's 5th congressional district. Its state senate district is State Senate District 13; its state house district is Assembly District 38.
County
| County | Share of residents |
|---|---|
| Jefferson County | 100% |
Congressional district
| Congressional district | Share of residents |
|---|---|
| Wisconsin's 5th congressional district (WI-05) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (WI-05) | Scott Fitzgerald (R) | 202-225-5101 | 100% |
| 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 13) | John Jagler (R) | 100% | |
| Assembly Member (Assembly District 38) | Will Penterman (R) | 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
- Jefferson website: http://www.jeffersonwis.com
- Jefferson laws: search for the Jefferson, 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 residents |
|---|---|
| State Senate District 13 | 100% |
| State house district | Share of residents |
|---|---|
| Assembly District 38 | 100% |
ZIP codes
Percentages mark ZIPs only partly in Jefferson: the share of that ZIP's residents living in it.
- 53549 (76%)
Get this in your AI agent
Your agent can get Jefferson's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:place:5537900")
Jefferson here is the Census Bureau's place boundary as of January 1, 2025. Shares are of 2020 Census population. Districts are the maps in force for the November 3, 2026 election.