Arizona Counties, Demographics & Geography
Complete official guide to all 15 counties in Arizona (AZ). Explore 2024 US Census population estimates, county seats, FIPS codes, land areas, and interactive mapping tools powered by GeoMap Suite.
Arizona County Breakdown
Showing 8 of 8 documented counties and seats.
County Name | FIPS | County Seat | Population (Census) | Land Area | Quick Tool |
|---|---|---|---|---|---|
| Maricopa County | 04013 | Phoenix | 4,420,568 | 9,200 sq mi | Lookup |
| Pima County | 04019 | Tucson | 1,043,433 | 9,187 sq mi | Lookup |
| Pinal County | 04021 | Florence | 425,264 | 5,366 sq mi | Lookup |
| Yavapai County | 04025 | Prescott | 236,209 | 8,123 sq mi | Lookup |
| Mohave County | 04015 | Kingman | 213,267 | 13,311 sq mi | Lookup |
| Yuma County | 04027 | Yuma | 203,881 | 5,514 sq mi | Lookup |
| Coconino County | 04005 | Flagstaff | 145,171 | 18,619 sq mi | Lookup |
| Cochise County | 04003 | Bisbee | 125,447 | 6,169 sq mi | Lookup |
Geographic Structure of Arizona Counties
County Administration & Governance
In Arizona, county governments manage vital public infrastructure, tax assessments, law enforcement, judicial courts, election administration, and public records. The county seat (Phoenix and other municipal headquarters) houses the primary courthouse, commissioners, and sheriff’s department.
All Arizona counties carry a unique 5-digit Federal Information Processing Standard (FIPS) code, where the first two digits (04) designate the state and the remaining three digits identify each specific jurisdiction.
Geographic & Demographic Highlights
- Most Populous County:Maricopa County (4,420,568 residents)
- Largest by Land Area:Coconino County (18,619 sq mi)
- State Capital:Phoenix
- Census Bureau Region:West United States
Demographic calculations derive from the United States Census Bureau 2024 Population Estimates Program (PEP) and TIGER/Line geographic boundary files.