The Arizona Legislature is divided into 30 legislative districts: one senator and two representatives are elected from the same district for each district.
Arizona legislative districts Wikipedia
There are 30 legislative districts in Arizona, each of which is a multimember constituency. Each district elects a state senator and two state representatives for a two-year term. Legislators are term limited to eight consecutive years in office, but can run again after two years or run for the opposite house than the one in which they serve.
Since Representatives and Senators are elected by exactly the same voters within the same district, each House of the Arizona Legislature tends to have members with identical political philosophies, which is illustrated by the fact that the Republican party has two-thirds of the seats in each House. This produces, in effect, a "two-house unicameral" legislature.
Arizona's electoral districts are different from the majority of U.S. states, where larger state senate districts and smaller assembly districts have different boundaries encompassing different communities. The crossing of upper and lower house districts into a single voting constituency is found in only six other U.S. state legislatures: the Idaho Legislature, Maryland General Assembly, New Jersey Legislature, North Dakota Legislative Assembly, South Dakota State Legislature, and Washington State Legislature.