99chambers

Wisconsin State Senate seat · lines in effect since 2024

Wisconsin Senate District 27

A district of about 177,000 people, 62% of adults with a bachelor's degree. It votes D+54.3 relative to the nation for president.

Dianne Hesselbein (D) · since Nov 8, 2022Next election Nov 5, 2030The 2026 race →

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.

D+54.34th most
Democratic
Most DemocraticMost Republican17th seat · the majority lineDistrict 27

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
U.S. SenateD+51.9

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 27.

Adults with a bachelor's degree62% 100th pct · 1st of 33 in WI

Highest of 33 seats.

White adults without a degree29% 9th pct · 30th of 33 in WI

Lower than 91% of seats.

Hispanic residents8% 72nd pct · 10th of 33 in WI

Higher than 72% of seats.

Black residents3% 66th pct · 12th of 33 in WI

Higher than 66% of seats.

Asian residents7% 100th pct · 1st of 33 in WI

Highest of 33 seats.

People per square mile510 62nd pct · 13th of 33 in WI

Denser than 62% 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. 1 of the 4 flipped this year.

District 26
58% college gradsD+71.1Not up in 2026District 16
46% college gradsD+30.1Not up in 2026District 7
44% college gradsD+29.5Held DDistrict 5
50% college gradsD+5.4Flipped 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.

  1. Dianne Hesselbein (D)
    2027– · Won 2026 unopposed

Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)