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 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.
|- style="height:2em"! rowspan=9 | 1| rowspan=9 align=left nowrap |
Hiram Fong| rowspan=9 | Republican| rowspan=9 nowrap | Aug 21, 1959 –
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 –
Jan 3, 1963| rowspan=2 | Democratic| rowspan=2 align=right nowrap |
Oren E. Long! rowspan=2 | 1
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 2| rowspan=3 | Elected in 1962.| rowspan=27 nowrap | Jan 3, 1963 –
Dec 17, 2012| rowspan=27 | Democratic| rowspan=27 align=right nowrap |
Daniel Inouye! 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 |
Spark Matsunaga| rowspan=7 | Democratic| rowspan=7 nowrap | Jan 3, 1977 –
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 –
May 16, 1990|
|- style="height:2em"! rowspan=14 | 3| rowspan=14 align=left nowrap |
Daniel Akaka| rowspan=14 | Democratic| rowspan=14 nowrap | May 16, 1990 –
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 –
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 –
present| rowspan=9 | Democratic| rowspan=9 align=right nowrap |
Brian Schatz! rowspan=9 | 3
|- style="height:2em"! rowspan=6 | 4| rowspan=6 align=left nowrap |
Mazie Hirono| rowspan=6 | Democratic| rowspan=6 nowrap | Jan 3, 2013 –
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 colspan=5 | To be determined in the 2024 election.| rowspan=3 | 12|
|- style="height:2em"|
|- style="height:2em"| | 13| colspan=5 | To be determined in the 2028 election.