thumb|upright=1.7|right|alt=refer to caption|Map of Arizona's nine congressional districts for the [[United States House of Representatives since 2022]]
Since Arizona became a U.S. state in 1912, it has sent congressional delegations to the United States Senate and United States House of Representatives, beginning with the 63rd United States Congress in 1913. Before becoming a state, the Arizona Territory elected a non-voting delegate at-large to Congress from 1864 to 1912. Arizona has sent nine members to the House in each delegation since the 2010 United States census.
A total of 60 people have served Arizona in the House and 15 have served Arizona in the Senate. The first woman to serve Arizona in the House was Isabella Greenway. Eight women have served Arizona in the House, including Kyrsten Sinema and Martha McSally, who also served Arizona in the Senate, the only women to do so.
The current deans, or longest-serving members, of the Arizona delegation are Republican Representatives David Schweikert of the and Paul Gosar of the , who have both served in the House since 2011. Carl Hayden was Arizona's longest-serving senator, and his 56 years as a senator is the sixth-longest tenure in American history.
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! scope="col" | Class I senator
! scope="col" | Class III senator
|- style="vertical-align: top;"
| frameless|upright=0.7<br/>Ruben Gallego<br/><br>
| frameless|upright=0.7|alt=Photograph of Mark Kelly, the current Senior senator from Arizona<br/>Mark Kelly<br/><br>
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! scope="row" | Party
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! scope="row" | Incumbent since and its nine representatives, six Republicans and three Democrats.
As of 2025, the Cook Partisan Voting Index, a measure of how strongly partisan a state is, ranked Arizona's 1st, 2nd, 5th, 8th, and 9th districts as leaning Republican, and the 3rd, 4th, and 7th districts as leaning Democratic. They ranked the 6th district is ranked as even. As a state, Arizona is ranked as leaning Republican, with a score of R+2.
United States Senate
Since it became a state in 1912, Both senators Barry Goldwater and John McCain have been nominated as the Republican candidate for president, in 1964 and 2008 respectively.
Sometimes considered a swing state, elections in Arizona are considered critical for party control of the Senate. Senators are elected every six years depending on their class, with each senator serving a six-year term, and elections for senators occurring every two years, rotating through each class such that in each election, around one-third of the seats in the Senate are up for election. Arizona's senators are elected in classes I and III. Currently, Arizona is represented in the Senate by Ruben Gallego and Mark Kelly.
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! scope="row" | (1957–1959)
|- style="height:2.5em"
! scope="row" | (1959–1961)
|- style="height:1.5em"
! scope="row" rowspan=2 | (1961–1963)
|- style="height:2em"
| | Mo Udall (D)
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1963–1973: 3 seats
Following the 1960 census, Arizona was apportioned three seats.
| rowspan=6 | Bob Stump (R)
| rowspan=2 | Eldon Rudd (R)
| | Jim McNulty (D)
|- style="height:2.5em"
! scope="row" |
| rowspan=5 | Jim Kolbe (R)
|- style="height:2.5em"
! scope="row" |
| rowspan=4 | Jay Rhodes (R)
| rowspan=4 | Jon Kyl (R)
|- style="height:2.5em"
! scope="row" |
|- style="height:1.5em"
! scope="row" rowspan=2 |
|- style="height:2em"
| | Ed Pastor (D)
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1993–2003: 6 seats
Following the 1990 census, Arizona was apportioned six seats.
|- style="height:2.5em"
! scope="row" |
| | Ann Kirkpatrick (D)
|- style="height:1.5em"
! scope="row" rowspan=2 |
| rowspan=2 | Paul Gosar (R)
| rowspan=2 | Ben Quayle (R)
| rowspan=2 | David Schweikert (R)
|- style="height:2em"
| | Ron Barber (D)
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2013–present: 9 seats
Since the 2010 census, Arizona has been apportioned nine seats.
{| class=wikitable style="text-align:center"
|+ Members of the House of Representatives from Arizona from 2013 to present
| rowspan=4 | Kyrsten<br/>Sinema (D)
|- style="height:2.5em"
! scope="row" |
| rowspan=3 | Martha<br/>McSally (R)
| rowspan=5 | Ruben<br/>Gallego (D)
|- style="height:1.5em"
! scope="row" rowspan=2 |
| rowspan=4 | Tom<br/>O'Halleran (D)
| rowspan=7 | Andy<br/>Biggs (R)
|- style="height:1.5em"
| rowspan=4 | Debbie<br/>Lesko (R)
|- style="height:2.5em"
! scope="row" |
| rowspan=2 | Ann<br/>Kirkpatrick (D)
| rowspan=2 | Greg<br/>Stanton (D)
|- style="height:2.5em"
! scope="row" |
|- style="height:2.5em"
! scope="row" |
| rowspan=3 | David<br/>Schweikert (R)
| rowspan=3 | Eli Crane (R)
| | Ruben<br/>Gallego (D)
| rowspan=3 | Greg<br/>Stanton (D)
| rowspan=3 | Juan<br/>Ciscomani (R)
| rowspan=2 | Raúl<br/>Grijalva (D)
| rowspan=3 | Paul<br/>Gosar (R)
|- style="height:2.5em"
! scope="row" rowspan=2 |
| rowspan=2 | Yassamin<br/>Ansari (D)
| rowspan=2 | Abraham<br/>Hamadeh (R)
|- style="height:2.5em"
| rowspan=1 | Adelita<br/>Grijalva (D)
|}
See also
- List of United States congressional districts
- Arizona's congressional districts
- Political party strength in Arizona