99chambers

Idaho State Senate seat · lines in effect since 2022

Idaho Legislative District 18

A district of about 40,000 people, 57% of adults with a bachelor's degree. It votes D+24.4 relative to the nation for president.

Janie Ward-Engelking (D) · since Nov 4, 2014Next election Nov 7, 2028The 2026 race →

Where it sits among all 35 seats

Every Idaho 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+24.42nd most
Democratic
Most DemocraticMost Republican18th seat · the majority lineDistrict 18

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.

20222024
Idaho State SenateD+32.1D+25.3

Outlined: the race for this seat itselfBlank: no race that year

Source: 99chambers results archive: precinct results allocated to current lines; 2026: Idaho Secretary of StateUpdated Nov 7, 2026, 3:01 PM ET

Who lives here, compared

Grey bars show the spread of all 35 seats. Small marks are other seats in Idaho. The black marker is District 18.

Adults with a bachelor's degree57% 97th pct · 2nd of 35 in ID

Higher than 97% of seats.

White adults without a degree36% 3rd pct · 34th of 35 in ID

Lower than 97% of seats.

Hispanic residents7% 24th pct · 27th of 35 in ID

Lower than 76% of seats.

Black residents1% 74th pct · 10th of 35 in ID

Higher than 74% of seats.

Asian residents5% 100th pct · 1st of 35 in ID

Highest of 35 seats.

People per square mile276 56th pct · 16th of 35 in ID

Denser than 56% 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 19
62% college gradsD+34.8Held DDistrict 15
38% college gradsR+5.3Flipped DDistrict 17
39% college gradsD+14.4Held DDistrict 16
44% college gradsD+19.9Held 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 2022.

  1. Janie Ward-Engelking (D)
    2023– · Won 2022 by 32.1, 2024 by 25.3, 2026 unopposed

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