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 Democrats Mark Kelly, serving since 2020, and Ruben Gallego, serving since 2025. Carl Hayden was the longest serving senator, served from 1927 to 1969. In total, only 15 individuals have ever served as a Senator from Arizona.
|- style="height:2em" | colspan=3 | Vacant | nowrap | Feb 14, 1912 âÂÂ<br/>Mar 27, 1912 | Arizona became a state February 14, 1912,<br/>but did not elect its U.S. senators until March 27. | rowspan=4 | 1 | rowspan=2 | rowspan=3 | 1 | Arizona became a state February 14, 1912,<br/>but did not elect its U.S. senators until March 27. | nowrap | Feb 14, 1912 âÂÂ<br/>Mar 27, 1912 | colspan=3 | Vacant
|- style="height:2em" ! rowspan=15 | 1 | rowspan=15 align=left | <br/>Henry F. Ashurst<br /> | rowspan=15 | Democratic | rowspan=15 nowrap | Mar 27, 1912 âÂÂ<br/>Jan 3, 1941 | rowspan=3 | Elected in 1912. | rowspan=2 | Elected in 1912. | rowspan=5 nowrap | Mar 27, 1912 âÂÂ<br/>Mar 3, 1921 | rowspan=5 | Democratic | rowspan=5 align=right | <br/>Marcus A. Smith<br /> ! rowspan=5 | 1
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 2 | rowspan=3 | Re-elected in 1914.Lost re-election.
|- style="height:2em" | rowspan=3 | Re-elected in 1916. | rowspan=3 | 2 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 3 | rowspan=3 | Elected in 1920.Lost re-election. | rowspan=3 nowrap | Mar 4, 1921 âÂÂ<br/>Mar 3, 1927 | rowspan=3 | Republican | rowspan=3 align=right | <br/>Ralph H. Cameron<br /> ! rowspan=3 | 2
|- style="height:2em" | rowspan=3 | Re-elected in 1922. | rowspan=3 | 3 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 4 | rowspan=3 | Elected in 1926. | rowspan=21 nowrap | Mar 4, 1927 âÂÂ<br/>Jan 3, 1969 | rowspan=21 | Democratic | rowspan=21 align=right | <br/>Carl Hayden<br /> ! rowspan=21 | 3
|- style="height:2em" | rowspan=3 | Re-elected in 1928. | rowspan=3 | 4 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 5 | rowspan=3 | Re-elected in 1932.
|- style="height:2em" | rowspan=3 | Re-elected in 1934.Lost renomination. | rowspan=3 | 5 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 6 | rowspan=3 | Re-elected in 1938.
|- style="height:2em" ! rowspan=6 | 2 | rowspan=6 align=left | <br/>Ernest McFarland<br /> | rowspan=6 | Democratic | rowspan=6 nowrap | Jan 3, 1941 âÂÂ<br/>Jan 3, 1953 | rowspan=3 | Elected in 1940. | rowspan=3 | 6 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 7 | rowspan=3 | Re-elected in 1944.
|- style="height:2em" | rowspan=3 | Re-elected in 1946.Lost re-election. | rowspan=3 | 7 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 8 | rowspan=3 | Re-elected in 1950.
|- style="height:2em" ! rowspan=6 | 3 | rowspan=6 align=left | <br/>Barry Goldwater<br /> | rowspan=6 | Republican | rowspan=6 nowrap | Jan 3, 1953 âÂÂ<br/>Jan 3, 1965 | rowspan=3 | Elected in 1952. | rowspan=3 | 8 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 9 | rowspan=3 | Re-elected in 1956.
|- style="height:2em" | rowspan=3 | Re-elected in 1958.Retired to run for U.S. President. | rowspan=3 | 9 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 10 | rowspan=3 | Re-elected in 1962.Retired.
|- style="height:2em" ! rowspan=6 | 4 | rowspan=6 align=left | <br/>Paul Fannin<br /> | rowspan=6 | Republican | rowspan=6 nowrap | Jan 3, 1965 âÂÂ<br/>Jan 3, 1977 | rowspan=3 | Elected in 1964. | rowspan=3 | 10 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 11 | rowspan=3 | Elected in 1968. | rowspan=9 nowrap | Jan 3, 1969 âÂÂ<br/>Jan 3, 1987 | rowspan=9 | Republican | rowspan=9 align=right | <br/>Barry Goldwater<br /> ! rowspan=9 | 4
|- style="height:2em" | rowspan=3 | Re-elected in 1970.Retired. | rowspan=3 | 11 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 12 | rowspan=3 | Re-elected in 1974.
|- style="height:2em" ! rowspan=9 | 5 | rowspan=9 align=left | <br/>Dennis DeConcini<br /> | rowspan=9 | Democratic | rowspan=9 nowrap | Jan 3, 1977 âÂÂ<br/>Jan 3, 1995 | rowspan=3 | Elected in 1976. | rowspan=3 | 12 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 13 | rowspan=3 | Re-elected in 1980.Retired.
|- style="height:2em" | rowspan=3 | Re-elected in 1982. | rowspan=3 | 13 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 14 | rowspan=3 | Elected in 1986. | rowspan=16 nowrap | Jan 3, 1987 âÂÂ<br/>Aug 25, 2018 | rowspan=16 | Republican | rowspan=16 align=right | <br/>John McCain<br /> ! rowspan=16 | 5
|- style="height:2em" | rowspan=3 | Re-elected in 1988.Retired. | rowspan=3 | 14 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 15 | rowspan=3 | Re-elected in 1992.
|- style="height:2em" ! rowspan=9 | 6 | rowspan=9 align=left | <br/>Jon Kyl<br /> | rowspan=9 | Republican | rowspan=9 nowrap | Jan 3, 1995 âÂÂ<br/>Jan 3, 2013 | rowspan=3 | Elected in 1994. | rowspan=3 | 15 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 16 | rowspan=3 | Re-elected in 1998.
|- style="height:2em" | rowspan=3 | Re-elected in 2000. | rowspan=3 | 16 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 17 | rowspan=3 | Re-elected in 2004.
|- style="height:2em" | rowspan=3 | Re-elected in 2006.Retired. | rowspan=3 | 17 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 18 | rowspan=3 | Re-elected in 2010.
|- style="height:2em" ! rowspan=6 | 7 | rowspan=6 align=left | <br/>Jeff Flake<br /> | rowspan=6 | Republican | rowspan=6 nowrap | Jan 3, 2013 âÂÂ<br/>Jan 3, 2019 | rowspan=6 | Elected in 2012.Retired. | rowspan=6 | 18 |
|- style="height:2em" |
|- style="height:2em" | rowspan=4 | rowspan=8 | 19 | Re-elected in 2016.Died.
|- style="height:2em" | | nowrap | Aug 25, 2018 âÂÂ<br/>Sep 4, 2018 | colspan=3 | Vacant
|- style="height:2em" | Appointed to continue McCain's term.Resigned. | nowrap | Sep 4, 2018 âÂÂ<br/>Dec 31, 2018 | | Republican | align=right | <br/>Jon Kyl<br /> ! 6
|- style="height:2em" | | nowrap | Dec 31, 2018 âÂÂ<br/>Jan 3, 2019 | colspan=3 | Vacant
|- style="height:2em" ! rowspan=5 | 8 | rowspan=5 align=left | <br/>Kyrsten Sinema<br /> | rowspan=3 | Democratic | rowspan=5 | Jan 3, 2019 âÂÂ<br />Jan 3, 2025 | rowspan=5 | Elected in 2018.Left the Democratic Party on December 9, 2022.Retired. | rowspan=5 | 19 | rowspan=2 | Appointed to continue McCain's term.Lost election to finish McCain's term. | nowrap | Jan 3, 2019 âÂÂ<br/>Dec 2, 2020 | | Republican | align=right | <br/>Martha McSally<br /> ! 7
|- style="height:2em" | rowspan=3 | Elected in 2020 to finish McCain's term. | rowspan=6 nowrap | Dec 2, 2020 âÂÂ<br />present | rowspan=6 | Democratic | rowspan=6 align=right | <br/>Mark Kelly<br /> ! rowspan=6 | 8
|- style="height:2em" | rowspan=2
|- style="height:2em" | rowspan=2 | Independent
|- style="height:2em" | | rowspan=3 | 20 | rowspan=3 | Re-elected in 2022.
|- style="height:2em" ! rowspan=3 | 9 | rowspan=3 align=left | <br/>Ruben Gallego<br /> | rowspan=3 | Democratic | rowspan=3 | Jan 3, 2025 âÂÂ<br />present | rowspan=3 | Elected in 2024. | rowspan=3 | 20 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=2 | 21 | rowspan=2 colspan=5 | To be determined in the 2028 election.
|- style="height:2em" | colspan=5 | To be determined in the 2030 election. | 21 |