1964 United States Senate election in Washington

1964 United States Senate election in Washington
	County results; Jackson: 50–60% 60–70% 70–80% 80–90%
U.S. senator before election; Henry M. Jackson; Democratic	Elected U.S. Senator ; Henry M. Jackson; Democratic

The 1964 United States Senate election in Washington was held on November 3, 1964. Incumbent Democrat Henry M. Jackson won a third term in office with a landslide victory over Republican Superintendent of Instruction Lloyd J. Andrews.

Blanket primary

1964 U.S. Senate primary election in Washington^[1]
Party		Candidate	Votes	%
	Democratic	Henry M. Jackson (incumbent)	478,892	59.61%
	Republican	Lloyd J. Andrews	216,616	26.96%
	Republican	David J. Williams	37,450	4.66%
	Democratic	Alice Franklin Bryant	29,052	3.62%
	Democratic	Arthur C. DeWitt	28,683	3.57%
	Republican	Mary Elizabeth Whitner	12,704	1.58%
Total votes			903,397	100.00%

1964 U.S. Senate election in Washington^[2]
Party		Candidate	Votes	%	±%
	Democratic	Henry M. Jackson (incumbent)	875,950	72.21%	5.11
	Republican	Lloyd J. Andrews	337,138	27.79%	3.59
Total votes			1,213,088	100.00%
	Democratic hold		Swing