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.

Find the most frequently visited departments, elected offices, and courts in Maricopa County.

MARICOPA COUNTY, Ariz. (Sept. 23, 2024) – Nearly 14,000 Notices of Intent to Reclassify Residential Property forms were mailed today for the 2025 tax year. The County Assessor is statutorily required to continually review residential... Read more

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 (/ ˌ m ær ɪ ˈ k oʊ p ə / 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 ...