Current delegation

Patty Murray (D)

Maria Cantwell (D)

Washington was admitted to the Union on November 11, 1889, and elects its United States senators to class 1 and class 3. Its current U.S. senators are Democrats Patty Murray (since 1993) and Maria Cantwell (since 2001) making it one of only four states alongside Minnesota, Nevada and New Hampshire to have two female U.S. senators. Warren Magnuson was Washington's longest-serving senator (1944–1981).

List of senators

Class 1 Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2000, 2006, 2012, and 2018. The next election will be in 2024.						C	Class 3 Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, 2016, and 2022. The next election will be in 2028.
#	Senator	Party	Dates in office	Electoral history	T		T	Electoral history	Dates in office	Party	Senator	#
Vacant			Nov 11, 1889 – Nov 20, 1889	Washington elected its first senators after it was admitted to the Union.	1	51st	1	Washington elected its first senators after it was admitted to the Union.	Nov 11, 1889 – Nov 20, 1889	Vacant
1	John B. Allen	Republican	Nov 20, 1889 – Mar 3, 1893	Elected in 1889. Legislature failed to re-elect.				Elected in 1889.	Nov 20, 1889 – Mar 3, 1897	Republican	Watson C. Squire	1
						52nd	2	Re-elected in 1891. Lost re-election.
Vacant			Mar 4, 1893 – Feb 19, 1895	Legislature failed to elect. The governor appointed John Allen, but the Senate rejected his credentials.	2	53rd
2	John L. Wilson	Republican	Feb 19, 1895 – Mar 3, 1899	Elected in 1895 to finish the vacant term, but took his seat late. Lost renomination.
						54th
						55th	3	Elected in 1897.[1] Lost re-election.[2]	Mar 4, 1897 – Mar 3, 1903	Democratic	George Turner	2
3	Addison G. Foster	Republican	Mar 4, 1899 – Mar 3, 1905	Elected in 1899.[3] Retired.	3	56th
						57th
						58th	4	Elected in 1903.[2] Lost renomination.	Mar 4, 1903 – Mar 3, 1909	Republican	Levi Ankeny	3
4	Samuel H. Piles	Republican	Mar 4, 1905 – Mar 3, 1911	Elected in 1905.[4] Retired.	4	59th
						60th
						61st	5	Elected in 1909.	Mar 4, 1909 – Nov 19, 1932	Republican	Wesley L. Jones	4
5	Miles Poindexter	Republican	Mar 4, 1911 – Mar 3, 1923	Elected in 1911.	5	62nd
		Progressive				63rd
		Republican				64th	6	Re-elected in 1914.
				Re-elected in 1916. Lost re-election.	6	65th
						66th
						67th	7	Re-elected in 1920.
6	Clarence Dill	Democratic	Mar 4, 1923 – Jan 3, 1935	Elected in 1922.	7	68th
						69th
						70th	8	Re-elected in 1926. Died, having already lost re-election.
				Re-elected in 1928. Retired.	8	71st
						72nd
									Nov 19, 1932 – Nov 22, 1932	Vacant
								Appointed to finish Jones's term. Retired.	Nov 22, 1932 – Mar 3, 1933	Republican	Elijah S. Grammer	5
						73rd	9	Elected in 1932.	Mar 4, 1933 – Nov 13, 1944	Democratic	Homer Bone	6
7	Lewis B. Schwellenbach	Democratic	Jan 3, 1935 – Dec 16, 1940	Elected in 1934. Resigned.	9	74th
						75th
						76th	10	Re-elected in 1938. Resigned to become Judge on the United States Court of Appeals for the Ninth Circuit.
Vacant			Dec 16, 1940 – Dec 19, 1940
8	Monrad Wallgren	Democratic	Dec 19, 1940 – Jan 9, 1945	Appointed to finish Schwellenbach's term, having already been elected to the next term.
				Elected in 1940. Resigned.	10	77th
						78th
									Nov 13, 1944 – Dec 14, 1944	Vacant
								Appointed to finish Bone's term, having already been elected to the next term.	Dec 14, 1944 – Jan 3, 1981	Democratic	Warren Magnuson	7
						79th	11	Elected in 1944.
9	Hugh Mitchell	Democratic	Jan 10, 1945 – Dec 25, 1946	Appointed to finish Wallgren's term. Lost election to next term and resigned.
10	Harry P. Cain	Republican	Dec 26, 1946 – Jan 3, 1953	Appointed to finish Wallgren's term, having already been elected to the next term.
				Elected in 1946. Lost re-election.	11	80th
						81st
						82nd	12	Re-elected in 1950.
11	Henry M. Jackson	Democratic	Jan 3, 1953 – Sep 1, 1983	Elected in 1952.	12	83rd
						84th
						85th	13	Re-elected in 1956.
				Re-elected in 1958.	13	86th
						87th
						88th	14	Re-elected in 1962.
				Re-elected in 1964.	14	89th
						90th
						91st	15	Re-elected in 1968.
				Re-elected in 1970.	15	92nd
						93rd
						94th	16	Re-elected in 1974. Lost re-election.
				Re-elected in 1976.	16	95th
						96th
						97th	17	Elected in 1980. Lost re-election.	Jan 3, 1981 – Jan 3, 1987	Republican	Slade Gorton	8
				Re-elected in 1982. Died.	17	98th
Vacant			Sep 1, 1983 – Sep 8, 1983
12	Daniel J. Evans	Republican	Sep 8, 1983 – Jan 3, 1989	Appointed to continue Jackson's term. Elected to finish Jackson's term. Retired.
						99th
						100th	18	Elected in 1986. Retired.	Jan 3, 1987 – Jan 3, 1993	Democratic	Brock Adams	9
13	Slade Gorton	Republican	Jan 3, 1989 – Jan 3, 2001	Elected in 1988.	18	101st
						102nd
						103rd	19	Elected in 1992.	Jan 3, 1993 – present	Democratic	Patty Murray	10
				Re-elected in 1994. Lost re-election.	19	104th
						105th
						106th	20	Re-elected in 1998.
14	Maria Cantwell	Democratic	Jan 3, 2001 – present	Elected in 2000.	20	107th
						108th
						109th	21	Re-elected in 2004.
				Re-elected in 2006.	21	110th
						111th
						112th	22	Re-elected in 2010.
				Re-elected in 2012.	22	113th
						114th
						115th	23	Re-elected in 2016.
				Re-elected in 2018.	23	116th
						117th
						118th	24	Re-elected in 2022.
To be determined in the 2024 election.					24	119th
						120th
						121st	25	To be determined in the 2028 election.
#	Senator	Party	Years in office	Electoral history	T	C	T	Electoral history	Years in office	Party	Senator	#
Class 1							Class 3