1980Final results
1980 election for Washington Legislative District 10-1
Washington House of Representatives · Washington
Simeon R. Wilson (R) won re-election with 55.8% of the vote, defeating Manuel E. Costa (D) by 11.5 points.
Simeon R. WilsonRepublican · winner · incumbent
55.8%22,698
Manuel E. CostaDemocrat
44.2%18,005
40,703 votes
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET
The seat over time
D − R margin in this seat's races around 1980
The seat's recent races
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)