Arizona.

1. 01Maricopa County2025 population estimate 4,689,558
2. 02Pima County2025 population estimate 1,074,685
3. 03Pinal County2025 population estimate 539,380
4. 04Yavapai County2025 population estimate 252,552
5. 05Mohave County2025 population estimate 228,102
6. 06Yuma County2025 population estimate 224,449
7. 07Coconino County2025 population estimate 144,368
8. 08Cochise County2025 population estimate 126,332
9. 09Navajo County2025 population estimate 109,946
10. 10Apache County2025 population estimate 64,445

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