2018Final results
2018 election for Alaska Senate District K
Alaska State Senate · Alaska
Mia Costello (R) won with 57.0% of the vote, defeating Sam Cason (D) by 14.3 points.
Mia CostelloRepublican · winner · incumbent
57.0%8,389
Sam CasonDemocrat
42.7%6,281
14,714 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