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Current delegation

Arizona was admitted to the Union on February 14, 1912. U.S. senators from Arizona belong to class 1 and class 3 and are popularly elected for a six-year term beginning January 3. Elections are held the first Tuesday after the first Monday in November. The state's current U.S. senators are Independent Kyrsten Sinema, serving since 2019, and Democrat Mark Kelly, serving since 2020. Carl Hayden was the longest serving senator, served from 1927 to 1969. Arizona is one of fifteen states alongside Colorado, Florida, Georgia, Hawaii, Idaho, Indiana, Louisiana, Maine, Massachusetts, Minnesota, Missouri, Nevada, South Dakota and Utah to have a younger senior senator and an older junior senator. In total, only 14 individuals have ever served as a Senator from Arizona.

List of senators

#	Senator	Party	Dates in office	Electoral history	T	C	T	Electoral history	Dates in office	Party	Senator	#
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 2010, 2016, 2020 (special election), and 2022. The next election will be in 2028.
Vacant			Feb 14, 1912 – Mar 27, 1912	Arizona became a state February 14, 1912, but did not elect its U.S. senators until March 27.	1	62nd	1	Arizona became a state February 14, 1912, but did not elect its U.S. senators until March 27.	Feb 14, 1912 – Mar 27, 1912	Vacant
1	Henry F. Ashurst	Democratic	Mar 27, 1912 – Jan 3, 1941	Elected in 1912.		62nd		Elected in 1912.	Mar 27, 1912 – Mar 3, 1921	Democratic	Marcus A. Smith	1
						63rd		Elected in 1912.
						64th	2	Re-elected in 1914. Lost re-election.
				Re-elected in 1916.	2	65th
						66th
						67th	3	Elected in 1920. Lost re-election.	Mar 4, 1921 – Mar 3, 1927	Republican	Ralph H. Cameron	2
				Re-elected in 1922.	3	68th
						69th
						70th	4	Elected in 1926.	Mar 4, 1927 – Jan 3, 1969	Democratic	Carl Hayden	3
				Re-elected in 1928.	4	71st
						72nd
						73rd	5	Re-elected in 1932.
				Re-elected in 1934. Lost renomination.	5	74th
						75th
						76th	6	Re-elected in 1938.
2	Ernest McFarland	Democratic	Jan 3, 1941 – Jan 3, 1953	Elected in 1940.	6	77th
						78th
						79th	7	Re-elected in 1944.
				Re-elected in 1946. Lost re-election.	7	80th
						81st
						82nd	8	Re-elected in 1950.
3	Barry Goldwater	Republican	Jan 3, 1953 – Jan 3, 1965	Elected in 1952.	8	83rd
						84th
						85th	9	Re-elected in 1956.
				Re-elected in 1958. Retired to run for U.S. President.	9	86th
						87th
						88th	10	Re-elected in 1962. Retired.
4	Paul Fannin	Republican	Jan 3, 1965 – Jan 3, 1977	Elected in 1964.	10	89th
						90th
						91st	11	Elected in 1968.	Jan 3, 1969 – Jan 3, 1987	Republican	Barry Goldwater	4
				Re-elected in 1970. Retired.	11	92nd
						93rd
						94th	12	Re-elected in 1974.
5	Dennis DeConcini	Democratic	Jan 3, 1977 – Jan 3, 1995	Elected in 1976.	12	95th
						96th
						97th	13	Re-elected in 1980. Retired.
				Re-elected in 1982.	13	98th
						99th
						100th	14	Elected in 1986.	Jan 3, 1987 – Aug 25, 2018	Republican	John McCain	5
				Re-elected in 1988. Retired.	14	101st
						102nd
						103rd	15	Re-elected in 1992.
6	Jon Kyl	Republican	Jan 3, 1995 – Jan 3, 2013	Elected in 1994.	15	104th
						105th
						106th	16	Re-elected in 1998.
				Re-elected in 2000.	16	107th
						108th
						109th	17	Re-elected in 2004.
				Re-elected in 2006. Retired.	17	110th
						111th
						112th	18	Re-elected in 2010.
7	Jeff Flake	Republican	Jan 3, 2013 – Jan 3, 2019	Elected in 2012. Retired.	18	113th
						114th
						115th	19	Re-elected in 2016. Died.
									Aug 25, 2018 – Sep 4, 2018	Vacant
								Appointed to continue McCain's term. Resigned.	Sep 4, 2018 – Dec 31, 2018	Republican	Jon Kyl	6
									Dec 31, 2018 – Jan 3, 2019	Vacant
8	Kyrsten Sinema	Democratic	Jan 3, 2019 – present	Elected in 2018. Left the Democratic Party on December 9, 2022. Retiring at the end of term.	19	116th		Appointed to continue McCain's term. Lost election to finish McCain's term.	Jan 3, 2019 – Dec 2, 2020	Republican	Martha McSally	7
						116th		Elected in 2020 to finish McCain's term.	Dec 2, 2020 – present	Democratic	Mark Kelly	8
						117th
		Independent				117th
		Independent				118th	20	Re-elected in 2022.
9	Ruben Gallego	Democratic	Taking office Jan 3, 2025	Elected in 2024.	20	119th
						120th
						121st	21	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						C	Class 3