2018Final results
2018 election for Massachusetts House District 166
Massachusetts House of Representatives · Massachusetts
Jeff Roy (D) won with 58.5% of the vote, defeating Patrick R. Casey (R) by 17.0 points.
Jeff RoyDemocrat · winner · incumbent
58.5%11,412
Patrick R. CaseyRepublican
41.4%8,087
19,514 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
The seat over time
D − R margin in this seat's races around 2018
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET