99chambers

Michigan State Senate seat · lines in effect since 2026

Michigan Senate District 1

A district of about 262,000 people, 22% Hispanic and 43% Black, 18% of adults with a bachelor's degree. It votes D+54.0 relative to the nation for president.

Erika Geiss (D) · since Nov 6, 2018Next election Nov 5, 2030The 2026 race →

Where it sits among all 38 seats

Every Michigan 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+54.03rd most
Democratic
Most DemocraticMost Republican20th seat · the majority lineDistrict 1

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.

201820202026
U.S. SenateD+84.9D+74.9No race
GovernorD+88.2No raceNo race
Michigan State SenateNo raceNo raceD+66.3

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 38 seats. Small marks are other seats in Michigan. The black marker is District 1.

Adults with a bachelor's degree18% 3rd pct · 37th of 38 in MI

Lower than 97% of seats.

White adults without a degree23% 8th pct · 35th of 38 in MI

Lower than 92% of seats.

Hispanic residents22% 100th pct · 1st of 38 in MI

Highest of 38 seats.

Black residents43% 95th pct · 3rd of 38 in MI

Higher than 95% of seats.

Asian residents1% 35th pct · 25th of 38 in MI

Lower than 65% of seats.

People per square mile4,257 89th pct · 5th of 38 in MI

Denser than 89% 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 29
37% college gradsD+26.8Held DDistrict 7
33% Black · 48% college gradsD+38.2Held DDistrict 27
28% Black · 22% college gradsD+20.2Held DDistrict 21
31% college gradsD+13.5Held 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 2026.

  1. Justin Onwenu (D)
    2027– · Won 2026 by 66.3

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