How Congressional Maps Are Drawn in Arizona

In most of America, politicians draw the maps that keep them in power. But in Arizona, the voters decided to do things differently. Here’s a look at the state's unique and often-imitated process for drawing its congressional district lines.

A Voter Revolt Against Gerrymandering

Until 2000, Arizona's redistricting process was like that of most states: the party in power in the state legislature got to draw the maps. This often led to gerrymandering, the practice of drawing bizarrely shaped districts to secure a political advantage for one party over another. In response, a coalition of citizens and groups got a measure on the ballot to strip the legislature of this power. In November 2000, voters passed Proposition 106, which amended the state constitution to create the Arizona Independent Redistricting Commission (AIRC). The goal was simple: take the power to draw maps away from self-interested politicians and give it to an independent, balanced group of citizens.

Assembling the Five-Person Commission

Creating this 'independent' body is a deliberately complex

process designed to ensure partisan balance. It starts after each U.S. Census, in years ending in 'one'. First, the state's Commission on Appellate Court Appointments vets applicants and creates a pool of 25 candidates: 10 Democrats, 10 Republicans, and five who are not affiliated with either major party. Next, the four top leaders in the state legislature—the Speaker of the House, the House Minority Leader, the Senate President, and the Senate Minority Leader—each choose one commissioner from this pool. This results in a four-person commission with two Democrats and two Republicans. Finally, these four commissioners select the fifth member from the pool of independents. This fifth member serves as the commission's chair, casting a potentially tie-breaking vote and holding significant influence over the process.

The Six Commandments of Map-Drawing

The Arizona Constitution doesn't just create the commission; it gives it a strict set of instructions. The AIRC must follow six criteria, in a specific order of priority. First and foremost, all districts must comply with the U.S. Constitution and the federal Voting Rights Act. Second, they must have nearly equal population. Third, districts must be geographically compact and contiguous (all parts connected) to the extent practicable. Fourth, district lines must respect 'communities of interest'—groups of people with common social or economic concerns. Fifth, where possible, lines should follow visible geographic features, city and county borders, or undivided census tracts. Only after all these other goals are met can the commission, as a sixth priority, favor creating more politically competitive districts.

From Draft Grids to Final Approval

The process is designed to be transparent. It starts with the commission creating 'grid maps' that divide the state into districts of equal population without considering any other factors. From there, the commissioners and their consultants begin adjusting the lines to meet the other five constitutional criteria. A crucial rule is that they cannot use party registration or voting history data during this initial drawing phase. Once they have a draft map, it's released to the public for a comment period of at least 30 days. The commission holds hearings across the state to gather feedback from citizens. After considering public input, the commission votes to adopt a final map. That map then has the force of law and does not need approval from the legislature or the governor.

Still a Political Battlefield

While the AIRC model is designed to be independent, it doesn't operate in a political vacuum. Every redistricting cycle in Arizona has been marked by intense public pressure and legal battles. The legislature itself sued to have the commission declared unconstitutional, arguing that the U.S. Constitution gives redistricting power only to the 'Legislature thereof'. In 2015, the U.S. Supreme Court ultimately upheld Arizona's system, ruling that 'legislature' could be interpreted to include the voter-driven initiative process. Despite this victory, every set of maps faces challenges in court, proving that even in a system built for fairness, the political stakes of drawing district lines are simply too high for the process to ever be truly free of conflict.