The 1998 United States Senate election in Washington was held November 3, 1998. Incumbent Democratic U.S. Senator Patty Murray won re-election to a second term.
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 County results
Murray: 50–60% 60–70% | |||||||||||||||||
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The election was not close, with Murray winning by 16.8% of the vote. Murray won in a landslide victory by wracking up huge margins in Western Washington. Specifically, Murray trounced Smith in the state’s most populous county, King County. Murray also managed to win six counties in the historically conservative eastern part of the state. Murray was sworn in for a second term on January 3, 1999.
| Party | Candidate | Votes | % | ||
|---|---|---|---|---|---|
| Democratic | Patty Murray (Incumbent) | 1,103,184 | 58.41% | ||
| Republican | Linda Smith | 785,377 | 41.59% | ||
| Total votes | 1,888,561 | 100.00% | |||
| Turnout | |||||
| Democratic hold | |||||
