What are the fastest-growing counties in Arizona?
Pinal County is the fastest-growing county in Arizona: its population grew 4.63% a year from 2020 to 2025, to 539,380 residents (Census PEP Vintage 2025). Yuma County (1.77%) and Mohave County (1.27%) follow. Arizona as a whole grew 1.19% a year to 7,623,818 residents.
Data as of 2026-09-23. Population, growth and migration: PEP Vintage 2025 · 2020–2025. Income migration: IRS SOI 2022–2023 (2-yr lag).
Top 10 counties in Arizona by population growth, 2020 to 2025
| Rank | County | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Pinal County | 539,380 | 4.63% | +95,001 | +9,831 | +$622.3M |
| 2 | Yuma County | 224,449 | 1.77% | +4,031 | +10,315 | +$6.6M |
| 3 | Mohave County | 228,102 | 1.27% | +25,261 | +420 | +$185.4M |
| 4 | Yavapai County | 252,552 | 1.26% | +24,565 | +1,219 | +$292.1M |
| 5 | Maricopa County | 4,689,558 | 1.08% | +76,991 | +117,779 | +$1.39B |
| 6 | Santa Cruz County | 50,020 | 0.95% | -83 | +1,495 | +$2.4M |
| 7 | Graham County | 40,157 | 0.78% | +894 | +141 | +$7.8M |
| 8 | Navajo County | 109,946 | 0.59% | +4,364 | +396 | +$30.2M |
| 9 | Pima County | 1,074,685 | 0.56% | +20,589 | +18,256 | +$240.2M |
| 10 | La Paz County | 16,711 | 0.18% | +872 | +392 | +$4.3M |
Where are people moving in Arizona?
Pinal County gained the most people from elsewhere in the United States: net domestic migration of +95,001 from 2020 to 2025 (Census PEP Vintage 2025). The table ranks every Arizona place with 10,000 or more residents by that figure; the IRS column shows net adjusted gross income migration for 2022 to 2023.
| Rank | County | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Pinal County | 539,380 | 4.63% | +95,001 | +9,831 | +$622.3M |
| 2 | Maricopa County | 4,689,558 | 1.08% | +76,991 | +117,779 | +$1.39B |
| 3 | Mohave County | 228,102 | 1.27% | +25,261 | +420 | +$185.4M |
| 4 | Yavapai County | 252,552 | 1.26% | +24,565 | +1,219 | +$292.1M |
| 5 | Pima County | 1,074,685 | 0.56% | +20,589 | +18,256 | +$240.2M |
| 6 | Navajo County | 109,946 | 0.59% | +4,364 | +396 | +$30.2M |
| 7 | Yuma County | 224,449 | 1.77% | +4,031 | +10,315 | +$6.6M |
| 8 | Gila County | 53,801 | 0.17% | +2,828 | +27 | +$20.9M |
| 9 | Cochise County | 126,332 | 0.13% | +1,903 | +970 | +$18.2M |
| 10 | Graham County | 40,157 | 0.78% | +894 | +141 | +$7.8M |
Go past the headline numbers
The interactive Demographics map layer and the full report for a single place are part of paid plans.
Get the Demographics Report for Pinal CountyFrequently asked questions
- What are the fastest-growing counties in Arizona?
- By population growth from 2020 to 2025, the fastest are Pinal County (4.63% a year), Yuma County (1.77% a year), Mohave County (1.27% a year), Yavapai County (1.26% a year) and Maricopa County (1.08% a year) (Census PEP Vintage 2025). Only places with 10,000 or more residents are ranked.
- Where are people moving in Arizona?
- By net domestic migration from 2020 to 2025, the largest gains are Pinal County (+95,001), Maricopa County (+76,991) and Mohave County (+25,261) (Census PEP Vintage 2025).
- How fast is Arizona growing overall?
- Arizona grew 1.19% a year from 2020 to 2025, to 7,623,818 residents, with net migration of +416,163 people (Census PEP Vintage 2025).
- Where does this Arizona data come from, and how current is it?
- Population, growth and migration come from the U.S. Census Bureau Population Estimates Program (PEP Vintage 2025 · 2020–2025). Income migration comes from IRS Statistics of Income (IRS SOI 2022–2023 (2-yr lag)). Counties with fewer than 10,000 residents are not ranked (1 of 15 in Arizona). Data last loaded 2026-09-23.
Data as of 2026-09-23: sources and periods
- Population, growth and migration
- U.S. Census Bureau, Population Estimates Program: PEP Vintage 2025 · 2020–2025. census.gov/programs-surveys/popest
- Income migration (net AGI)
- Internal Revenue Service, Statistics of Income migration data: IRS SOI 2022–2023 (2-yr lag). irs.gov/statistics/soi-tax-stats-migration-data
How to read the table
- Population is the Census July 1 estimate of the latest vintage.
- Growth is the compound annual rate over 2020 to 2025.
- Net domestic and international migration are cumulative people over 2020 to 2025.
- IRS net AGI migration is adjusted gross income that moved in, less what moved out, for 2022 to 2023. A plus sign means a net inflow.
- Places with fewer than 10,000 residents are left out of the rankings.