Arizona's 1st congressional district is a congressional district located in the U.S. state of Arizona. Geographically, it is the tenth largest congressional district in the country and includes much of the state outside the Phoenix and Tucson metropolitan areas.
The district borders were changed after Arizona gained two seats in the 2000 U.S. Census - the old 1st District, based in Mesa and at one time the east side of Phoenix, was renumbered the 6th District. Another area of the 1st District, containing the North Indian Bend Wash Superfund Site that the Environmental Protection Agency (EPA) first documented in 1981, became part of what is now the 5th District.
After the 2012 redistricting, the Hopi reservation that had previously been contained within the 2nd District was redrawn into the 1st, while Prescott and surrounding areas of Yavapai County were drawn into the new, heavily Republican 4th district. The district is now considered to be significantly more competitive for Democrats.
George W. Bush received 54% of the vote in this district in 2004. John McCain also carried the district in 2008 with 54.42% of the vote while Barack Obama received 44.25%. Due to intense competition, it is generally considered a swing district.