Results of the 2018 United States House of Representatives elections in Arizona by district:[1] Tom O'Halleran Democratic Tom O'Halleran Democratic The 1st district is home to the Grand Canyon and stretches along the eastern and northeastern portions of the state and includes Casa Grande, Flagstaff, and Marana.

Labor unions Labor unions Organizations Newspapers Paul Gosar Republican Paul Gosar Republican The fourth district takes up most of rural northwestern and western Arizona and includes Kingman, Lake Havasu City, Prescott, and San Tan Valley.

Labor unions This race received national media coverage after Democratic nominee David Brill aired television advertisements in which six of Republican incumbent Paul Gosar's nine siblings each condemned their brother and endorsed Brill, imploring residents of the fourth district to vote their brother out of office.

[97] Gosar responded to this advert with a tweet in which he dismissed his siblings' criticisms and characterized them as "disgruntled Hillary supporters" who "put political ideology before family".

[98] Organizations Labor unions Organizations Andy Biggs Republican Andy Biggs Republican The 5th district is based in the East Valley region of suburban Phoenix and includes Gilbert and Queen Creek, as well as portions of Chandler and Mesa.

Labor unions Organizations Debbie Lesko Republican Debbie Lesko Republican The eighth district is based in the West Valley region of suburban Phoenix and includes the cities of El Mirage, Peoria, and Surprise, and also many retirement communities such as Sun City.

Republican Trent Franks who had represented the district since 2003[2] resigned from Congress on December 8, 2017, after a controversy regarding surrogate mothers.

[108] Republican Debbie Lesko won the special election that took place on April 24, 2018, defeating Democratic nominee Hiral Tipirneni with 53% of the vote.

Labor unions The Lesko campaign was criticized for producing yard sign attacking Tipirneni as a "fake doctor" and as a "phony."

Incumbent Democrat Kyrsten Sinema, who had represented the district since 2013, did not seek re-election, instead running for U.S. Senate.