Arizona's 20th legislative district is one of 30 in the state, consisting of a section of Pima County.

As of 2023, there are 56 precincts in the district, all in Pima, with a total registered voter population of 125,451.

According to the AIRC, the district is outside of competitive range and considered leaning Democratic.

[3] The district is represented in the 56th Arizona State Legislature, which convenes from January 1, 2023 to December 31, 2024, by Sally Ann Gonzales (D-Tucson) in the Arizona Senate and by Alma Hernandez (D-Tucson) and Betty Villegas (D-Tucson) in the Arizona House of Representatives.

[4][5] On July 31, 2023, Betty Villegas was admitted into the House to fill the vacancy caused when Democratic Representative Andrés Cano resigned.