Welcome to Maricopa County, the 4th populous county in the nation with over 13,000 employees working together to continually improve residents quality of air, environment, public health, human services, animal shelters, roads, planning & development, elections, courts, parks, and more.

Maricopa County (/ ˌ m ær ɪ ˈ k oʊ p ə /) is a county in the south-central part of the U.S. state of Arizona. As of the 2020 census the population was 4,420,568, [ 1 ] or about 62% of the state's total, making it the fourth-most populous county in the United States and the most populous county in Arizona, and making Arizona one of the ...

Maricopa County is one of the nation's fastest growing counties, home to approximately four and a half million people. We believe in service that helps you solve a problem, move forward with a project, manage a difficult situation, or simply check something off your list.

Our office is responsible for the public recording of more than 50 million documents in Maricopa County, the mail voting process, and maintains voter registration for more than 2.6 million eligible voters.

301 West Jefferson Street Phoenix, Arizona 85003 Main Line: 602-506-3011 ADA Compliance

The nation’s 4th largest county in terms of population; 2022 population of 4.5 million people, according to U.S. Census Bureau; Makes up more than half of Arizona’s population; Fastest-growing county in the United States, with more than 56,000 people added between July 2021-2022 ; https://www.census.gov/quickfacts/maricopacountyarizona

Maricopa County (/ ˌmærɪˈkoʊpə / MARR-i-KOH-pə) is a county in the south-central part of the U.S. state of Arizona. As of the 2020 census, its population was 4,420,568, [1] making it the state's most populous county. It is more populous than 23 states. The county seat is Phoenix, [2] the state capital and fifth-most populous city in the country.

The Judicial Branch of Arizona in Maricopa County, Arizona - comprised of Superior Court, Adult Probation, and Juvenile Probation, including juvenile detention - provides information on court proceedings, jury service, locations, court forms, and more.

Maricopa County is a county located in the U.S. state of Arizona. It's county seat is Phoenix. As per 2020 census, the population of Maricopa County is 4496588 people and population density is square miles.

2 days ago · The Maricopa County Board of Supervisors, which oversee everything from land use issues and regional public health to restaurant inspections and animal shelters, welcomed three new members in 2025.