Arizona's 4th Legislative District is one of 30 in the state, covering parts of Pima, Maricopa, Pinal, and Yuma counties. As of 2021, there are 59 precincts in the district – 23 in Yuma, 18 in Maricopa, 17 in Pima, and 1 in Pinal – with a total registered voter population of 111,437. The district has an overall population of 216,706.