99chambers

Michigan House of Representatives seat · lines in effect since 2024

Michigan House District 90

A district of about 106,000 people, 41% of adults with a bachelor's degree. It votes R+18.6 relative to the nation for president.

Bryan Posthumus (R) · since Nov 3, 2020Next election Nov 7, 2028The 2026 race →

Where it sits among all 110 seats

Every Michigan House of Representatives seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.

R+18.675th most
Democratic
Most DemocraticMost Republican56th seat · the majority lineDistrict 90

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
Michigan House of RepresentativesR+27.0R+14.6

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 110 seats. Small marks are other seats in Michigan. The black marker is District 90.

Adults with a bachelor's degree41% 78th pct · 25th of 110 in MI

Higher than 78% of seats.

White adults without a degree53% 48th pct · 58th of 110 in MI

Lower than 52% of seats.

Hispanic residents6% 70th pct · 34th of 110 in MI

Higher than 70% of seats.

Black residents1% 15th pct · 94th of 110 in MI

Lower than 85% of seats.

Asian residents1% 31st pct · 76th of 110 in MI

Lower than 69% of seats.

People per square mile351 40th pct · 66th of 110 in MI

Less dense than 60% 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 51
39% college gradsR+19.9Held RDistrict 72
36% college gradsR+13.6Held RDistrict 52
38% college gradsR+16.8Held RDistrict 42
36% college gradsR+8.6Counting

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. Lynn Afendoulis (R)
    2027– · Won 2026 by 14.6
  2. Bryan Posthumus (R)
    2025–2027 · Won 2024 by 27.0

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