2018Final results
2018 election for Connecticut Senate District 19
Connecticut State Senate · Connecticut
Cathy Osten (D) won with 57.9% of the vote, defeating Mark A. Lounsbury (R) by 15.8 points.
Cathy OstenDemocrat · winner · incumbent
57.9%21,389
Mark A. LounsburyRepublican
42.1%15,567
36,956 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