Hawaii was admitted to the Union on August 21, 1959, and elects U.S. senators to classes 1 and 3. Seven people including only one Republican have served as a U.S. senator from Hawaii. The state's current U.S. senators are Democrats Brian Schatz and Mazie Hirono. Hawaii's class 1 seat is the only one in the United States that has always been held by an ethnic minority. Its class 3 seat is the only one in the United States that has always been held by a member of the Democratic Party. Hawaii is one of fourteen states alongside California, Colorado, Georgia, Idaho, Louisiana, Maine, Massachusetts, Minnesota, Missouri, Nevada, Pennsylvania, South Dakota and Utah to have a younger senior senator and an older junior senator.
Hawaii last elected a Republican in 1970, which has resulted in the longest streak in the nation for a state's having all-Democratic senators. Daniel K. Inouye was Hawaii's longest-serving senator, from 1963 to 2012. Hawaii is the only U.S. state that has never defeated an incumbent senator in either a primary or general election.
|- style="height:2em" ! rowspan=9 | 1 | rowspan=9 align=left nowrap | <br/>Hiram Fong<br /> | rowspan=9 | Republican | rowspan=9 nowrap | Aug 21, 1959 âÂÂ<br/>Jan 3, 1977 | rowspan=3 | Elected in 1959. | rowspan=3 | 1 | | rowspan=2 | 1 | rowspan=2 | Elected in 1959.Retired. | rowspan=2 nowrap | Aug 21, 1959 âÂÂ<br/>Jan 3, 1963 | rowspan=2 | Democratic | rowspan=2 align=right nowrap | <br/>Oren E. Long<br /> ! rowspan=2 | 1
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 2 | rowspan=3 | Elected in 1962. | rowspan=27 nowrap | Jan 3, 1963 âÂÂ<br />Dec 17, 2012 | rowspan=27 | Democratic | rowspan=27 align=right nowrap | <br/>Daniel Inouye<br /> ! rowspan=27 | 2
|- style="height:2em" | rowspan=3 | Re-elected in 1964. | rowspan=3 | 2 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 3 | rowspan=3 | Re-elected in 1968.
|- style="height:2em" | rowspan=3 | Re-elected in 1970.Retired. | rowspan=3 | 3 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 4 | rowspan=3 | Re-elected in 1974.
|- style="height:2em" ! rowspan=7 | 2 | rowspan=7 align=left nowrap | <br/>Spark Matsunaga<br /> | rowspan=7 | Democratic | rowspan=7 nowrap | Jan 3, 1977 âÂÂ<br/>Apr 15, 1990 | rowspan=3 | Elected in 1976. | rowspan=3 | 4 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 5 | rowspan=3 | Re-elected in 1980.
|- style="height:2em" | rowspan=3 | Re-elected in 1982. | rowspan=3 | 5 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=5 | 6 | rowspan=5 | Re-elected in 1986.
|- style="height:2em" | Re-elected in 1988.Died. | rowspan=5 | 6 | rowspan=3
|- style="height:2em" | colspan=3 | Vacant | Apr 15, 1990 âÂÂ<br/>May 16, 1990 |
|- style="height:2em" ! rowspan=14 | 3 | rowspan=14 align=left nowrap | <br/>Daniel Akaka<br /> | rowspan=14 | Democratic | rowspan=14 nowrap | May 16, 1990 âÂÂ<br/>Jan 3, 2013 | rowspan=3 | Appointed to continue Matsunaga's term.Elected in 1990 to finish Matsunaga's term.
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 7 | rowspan=3 | Re-elected in 1992.
|- style="height:2em" | rowspan=3 | Re-elected in 1994. | rowspan=3 | 7 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 8 | rowspan=3 | Re-elected in 1998.
|- style="height:2em" | rowspan=3 | Re-elected in 2000. | rowspan=3 | 8 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 9 | rowspan=3 | Re-elected in 2004.
|- style="height:2em" | rowspan=5 | Re-elected in 2006.Retired. | rowspan=5 | 9 |
|- style="height:2em" |
|- style="height:2em" | rowspan=3 | rowspan=5 | 10 | Re-elected in 2010.Died.
|- style="height:2em" | | nowrap | Dec 17, 2012 âÂÂ<br/>Dec 26, 2012 | colspan=3 | Vacant
|- style="height:2em" | rowspan=3 | Appointed to continue Inouye's term.Elected in 2014 to finish Inouye's term. | rowspan=9 nowrap | Dec 26, 2012 âÂÂ<br />present | rowspan=9 | Democratic | rowspan=9 align=right nowrap | <br/>Brian Schatz<br /> ! rowspan=9 | 3
|- style="height:2em" ! rowspan=9 | 4 | rowspan=9 align=left nowrap | <br/>Mazie Hirono<br /> | rowspan=9 | Democratic | rowspan=9 nowrap | Jan 3, 2013 âÂÂ<br/>present | rowspan=3 | Elected in 2012. | rowspan=3 | 10 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 11 | rowspan=3 | Re-elected in 2016.
|- style="height:2em" | rowspan=3 | Re-elected in 2018. | rowspan=3 | 11 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 12 | rowspan=3 | Re-elected in 2022.
|- style="height:2em" | rowspan=3 | Re-elected in 2024. | rowspan=3 | 12 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=2 | 13 | rowspan=2 colspan=5 | To be determined in the 2028 election.
|- style="height:2em" | colspan=5 | To be determined in the 2030 election. | 13 |