About

The Office of County Administration (OCA) was established by the Harris County Commissioners Court in June of 2021. OCA is responsible for overseeing the day-to-day operations of Harris County government. OCA is led by County Administrator Diana Ramirez, who is appointed by Commissioners Court and serves as Harris County’s Chief Administrative Officer. The County Administrator is tasked with direct supervision of 16 departments and broad coordination of long-term strategic planning efforts, performance management, and fiscal responsibility in alignment with Commissioners Court goals.

Countywide Organizational Chart

With 4.8 million residents, Harris County is the most populous county in Texas and the third-most populous county in the United States. Located in southeast Texas on the Gulf Coast, Harris County is known for its robust economy with strengths in the energy industry, aerospace, medical center, and international trade via the Port of Houston. Harris County’s diverse communities speak over 145 languages, making the region a hub for arts, food, and culture.