COUNTY · AZ

Maricopa County, Arizona

Maricopa County is a county in Arizona with FIPS code 04013 and an estimated population of 4,585,871 (Census 2023), 1st largest of 15 in the state.

County facts

Name: Maricopa County
State: Arizona
Type: county
FIPS code: 04013
State FIPS: 04
Population (2023): 4,585,871
Change since 2020: +3.2%
State rank: 1 of 15

Population is the Census Bureau’s Vintage 2023 estimate.

Major cities in Maricopa County

Chandler Gilbert Mesa Phoenix Scottsdale Tempe

Other counties in Arizona

Pima County Pinal County Yavapai County Mohave County Yuma County Coconino County Cochise County Navajo County All 15

Questions

What is the FIPS code for Maricopa County?

Maricopa County, Arizona has the five-digit FIPS code 04013: 04 for the state and 013 for the county.

What state is Maricopa County in?

Maricopa County is in Arizona.

How do I know if an address is in this county?

Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.

Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.