The U.S. Census Bureau released 2020 Census apportionment results on April 26, 2021.
According to these results, Arizona's total resident population as of April 1, 2020 was 7,151,502. The apportionment population used for Arizona was 7,158,923. This includes Arizona's resident population plus a count of the U.S. military personnel and federal civilian employees living outside the United States (and their dependents living with them) who can be allocated to Arizona as their home state.
For more details and data tables, please visit the U.S. Census Bureau's 2020 Census Apportionment Results page: https://www.census.gov/data/tables/2020/dec/2020-apportionment-data.html