Maricopa County Sheriff's Office

The Maricopa County Sheriff's Office (MCSO) is the law enforcement agency that serves Maricopa County, Arizona, and is the largest sheriff's office in Arizona. The MCSO provides patrol services and criminal investigation to unincorporated areas of the county and operates the county jail system. It serves as the primary law enforcement agency for any incorporated cities within the county that have contracted with the agency for law-enforcement services.