99chambers

Wisconsin State Assembly seat · lines in effect since 2024

Wisconsin Assembly District 40

A district of about 64,000 people, 26% of adults with a bachelor's degree. It votes D+5.7 relative to the nation for president.

Karen DeSanto (D) · since Nov 5, 2024Next election Nov 7, 2028The 2026 race →

Where it sits among all 99 seats

Every Wisconsin State Assembly 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+5.741st most
Democratic
Most DemocraticMost Republican50th seat · the majority lineDistrict 40

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.

20242026
U.S. SenateD+8.1No race
Wisconsin State AssemblyD+8.2D+16.0

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 99 seats. Small marks are other seats in Wisconsin. The black marker is District 40.

Adults with a bachelor's degree26% 26th pct · 74th of 99 in WI

Lower than 74% of seats.

White adults without a degree66% 78th pct · 23rd of 99 in WI

Higher than 78% of seats.

Hispanic residents5% 41st pct · 59th of 99 in WI

Lower than 59% of seats.

Black residents2% 51st pct · 49th of 99 in WI

Higher than 51% of seats.

Asian residents1% 20th pct · 79th of 99 in WI

Lower than 80% of seats.

People per square mile90 24th pct · 75th of 99 in WI

Less dense than 76% 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 51
29% college gradsD+4.7Flipped DDistrict 95
28% college gradsD+3.8Held DDistrict 50
33% college gradsD+15.5Held DDistrict 44
26% college gradsD+11.9Held 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.

  1. Karen Desanto (D)
    2025– · Won 2024 by 8.2, 2026 by 16.0

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