Yes.

Republican registration increased in every Arizona county between the November 2024 election and October 2025, the most recent month for which data is available. Overall, the number of registered Republicans rose by more than 41,000 during that period, with Santa Cruz County seeing the biggest increase at 4.2%.

Records from the Arizona Secretary of State’s Office indicate that these increases were driven primarily by new registrations, rather than a widespread partisan shift. While President Donald Trump improved his margins in several traditionally Democratic counties in 2024, helping flip the state overall, many counties did not change party control or become significantly more Republican, according to a Newsweek analysis. Arizona experienced uneven gains across the state, with some counties shifting modestly and others remaining solidly Democratic. 

This fact brief is responsive to conversations such as this one.

The Arizona Center for Investigative Reporting partners with Gigafact to produce fact briefs, or quick-response fact checks, about trending claims relating to Arizona.

Sources

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The Arizona Center for Investigative Reporting is partnering with Gigafact to produce timely fact briefs, or quick-response fact checks, about trending claims relating to Arizona.

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Tallulah Anne is a fact-checker for the Arizona Center for Investigative Reporting, working in partnership with Gigafact. Originally from Lewes, England, Tallulah recently earned her bachelor’s degree from ASU’s Cronkite School of Journalism. During her time at the Cronkite School, Tallulah led a national, year-long investigation at the Howard Center for Investigative Journalism, freelanced for the The New York Times and contributed to local news outlets across the state. She is passionate about accountability reporting, survivor-centered storytelling, and building trust through transparency and documentation.