Arizona's 9th congressional district was created as a result of the 2010 census. The first candidates ran in the 2012 House elections, and the first representative was seated for the 113th Congress in 2013. Formerly located in the Phoenix area, the 9th district has been in western Arizona since 2023.

Paul Gosar, who previously represented the 1st and 4th districts, was elected to the seat in 2022 following redistricting. He was sworn in on January 3, 2023. With a Cook Partisan Voting Index rating of R+16, it is the most Republican district in Arizona.

Because it was created in the 2010 redistricting cycle, the first iteration of the 9th district was in effect for election cycles from 2012 to 2020. This version of the district was entirely within Maricopa County. The district included parts of the 2003–2013 versions of the 3rd, 4th, 5th, and 6th districts. Over 60% of the district's population came from the previous 5th district. During this period, the 9th district included liberal bastions such as Tempe, strongly conservative portions of the East Valley, and more moderate Republican voters in eastern and southern Phoenix.

Following the 2020 redistricting cycle, this district essentially became the 4th district, while the 9th was redrawn to cover most of the old 4th district. The 9th district's current boundaries include all of La Paz County, most of Mohave County, most of Yuma County, and the western part of Maricopa County. It covers the majority of Arizona's western border, and like its predecessor is heavily Republican, being the most Republican district in Arizona and the fifth-most-Republican district in the West. The 4th's incumbent, Paul Gosar, transferred to the 9th and was re-elected unopposed.

#	County	Seat	Population
12	La Paz	Parker	16,710
13	Maricopa	Phoenix	4,585,871
15	Mohave	Kingman	223,682
27	Yuma	Yuma	213,221

• Glendale – 248,325
• Surprise – 143,148
• Yuma – 95,548
• Goodyear – 95,294
• Buckeye – 91,502
• Lake Havasu City – 57,144
• Bullhead City – 41,348
• Kingman – 32,689
• Fortuna Foothills – 27,776
• Fort Mohave – 16,190
• New Kingman-Butler – 12,907

• Golden Valley – 8,801
• Wickenburg – 7,920
• Litchfield Park – 6,847
• Citrus Park – 5,194
• Parker – 3,417
• Desert Hills – 2,764
• Mohave Valley – 2,693
• Colorado City – 2,550

Year	Office	Results
2012	President	Obama 51 - 47%
2016	President	Clinton 55 - 38%
2020	President	Biden 61 - 37%

Arizona began sending a ninth member to the House after the 2010 census, the 2012 congressional election, and the convening of the 113th Congress.

Representative (Residence)	Party	Years	Cong ress	Electoral history	District location
District created January 3, 2013
Kyrsten Sinema (Phoenix)	Democratic	January 3, 2013 – January 3, 2019	113th 114th 115th	Elected in 2012. Re-elected in 2014. Re-elected in 2016. Retired to run for U.S. senator.	2013–2023: Part of Maricopa County
Greg Stanton (Phoenix)	Democratic	January 3, 2019 – January 3, 2023	116th 117th	Elected in 2018. Re-elected in 2020. Redistricted to the 4th district.
Paul Gosar (Bullhead City)	Republican	January 3, 2023 – present	118th	Redistricted from the 4th district and re-elected in 2022. Re-elected in 2024.	2023–present: Parts of La Paz, Mohave, Yuma, and Maricopa counties

General election

Party		Candidate	Votes	%
	Democratic	Kyrsten Sinema	121,881	48.66%
	Republican	Vernon B. Parker	111,630	44.56%
	Libertarian	Powell Gammill	16,620	6.63%
	Write-In	Write-ins	363	0.14%
Plurality			10,251	4.10%
Total votes			250,494	100.00
	Democratic gain from new constituency

General election

Party		Candidate	Votes	%
	Democratic	Kyrsten Sinema (incumbent)	88,609	54.68%
	Republican	Wendy Rogers	67,841	41.86%
	Libertarian	Powell Gammill	5,612	3.46%
Total votes			162,062	100.0
	Democratic hold

General election

Party		Candidate	Votes	%
	Democratic	Kyrsten Sinema (incumbent)	169,055	60.9
	Republican	Dave Giles	108,350	39.1
	Green	Cary Dolego (write-in)	60	0.0
	Independent	Axel Bello (write-in)	46	0.0
Total votes			277,507	100.0
	Democratic hold

General election

Party		Candidate	Votes	%
	Democratic	Greg Stanton	146,659	60.87
	Republican	Steve Ferrara	94,264	39.13
Margin of victory			52,395	21.74
Total votes			240,923	100.0%
	Democratic hold

General election

Party		Candidate	Votes	%
	Democratic	Greg Stanton (incumbent)	217,094	61.63
	Republican	Dave Giles	135,180	38.37
Margin of victory			81,914	23.25
Total votes			352,274	100.0%
	Democratic hold

General election

Party		Candidate	Votes	%
	Republican	Paul Gosar	192,796	97.8
	Democratic	Richard Grayson (write-in)	3,531	1.8
	Democratic	Tom T. (write-in)	858	0.4
Total votes			197,185	100.0
	Republican gain from Democratic

• Maps of Congressional Districts first in effect for the 2002 election
• Final Congressional Maps for the 2012 election Archived October 12, 2012, at the Wayback Machine
• Rose Institute of State and Local Government, "Arizona: 2010 Redistricting Changes: Ninth District", Redistricting by State, Claremont, CA: Claremont McKenna College, archived from the original on September 15, 2020

33°25′N 111°55′W / 33.417°N 111.917°W / 33.417; -111.917