Wisconsin State Senate seat · lines in effect since 2024
Wisconsin Senate District 21
A district of about 177,000 people, 34% of adults with a bachelor's degree. It votes D+1.4 relative to the nation for president.
Where it sits among all 33 seats
Every Wisconsin State Senate seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.
Democratic
Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Every race on these lines
Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.
| 2024 | 2026 | |
|---|---|---|
| U.S. Senate | D+2.2 | No race |
| Wisconsin State Senate | No race | D+13.3 |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: civicAPIUpdated Nov 7, 2026, 3:01 PM ET
Who lives here, compared
Grey bars show the spread of all 33 seats. Small marks are other seats in Wisconsin. The black marker is District 21.
Higher than 75% of seats.
Lower than 72% of seats.
Higher than 94% of seats.
Higher than 91% of seats.
Higher than 53% of seats.
Denser than 72% of seats.
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET
Seats most like this one
Nearest seats on demographics, density and lean.
District 2229% college gradsD+8.4Not up in 2026District 30
31% college gradsD+3.6Not up in 2026District 18
31% college gradsD+8.8Not up in 2026District 15
26% college gradsD+8.9Held D
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Who has held it
These lines took effect in 2024.
- Trevor Jung (D)
2027– · Won 2026 by 13.3
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)