Fastest Growing Counties in Arizona (2025)

County
Rank
Change (2020)
2025 Pop.
2020 Pop.
Pinal County121.49%522,643430,187
Yuma County27.9%221,915205,659
Yavapai County37.41%254,783237,217
Mohave County47.03%229,236214,185
Graham County55.91%40,93138,646
Santa Cruz County65.03%50,11447,712
Maricopa County74.52%4,645,9474,445,059
La Paz County82.96%17,06016,569
Navajo County92.96%109,925106,763
Pima County102.81%1,074,5341,045,175
Gila County111.53%54,16553,351
Coconino County12-0.15%144,970145,192
Greenlee County13-0.79%9,4539,528
Cochise County14-2.06%122,946125,527
Apache County15-2.84%64,04265,913

Arizona County Growth Overview

Arizona's counties show varied growth patterns from 2020 to 2025. Pinal County leads with 21.49% annualized growth, followed by Yuma County (7.9%) and Yavapai County (7.41%). The largest counties are Maricopa County (4,645,947), Pima County (1,074,534), and Pinal County (522,643). Of the 15 counties in Arizona, 11 are growing while 4 have experienced population decline. Overall, counties averaged 4.25% annualized growth, with total population growing by 5.23% annually.