About OC Auditor-Controller

The Orange County Auditor-Controller’s Office ensures that the County of Orange operates with financial integrity, accountability, and transparency. With more than 400 dedicated professionals, the office plays a critical role in managing, safeguarding, and reporting on billions of dollars in public funds that support essential County services. Every County service from healthcare and public safety to infrastructure and social services depends on sound financial management. The Auditor-Controller’s Office ensures that public dollars are accounted for, protected, and reported accurately, reinforcing trust between the County and the community it serves. Our Office serves as the County’s central financial steward, providing independent oversight, and essential accounting services that keep County operations running smoothly and responsibly. Our responsibilities span the full financial lifecycle from payroll and accounting to property tax distribution, financial reporting, and compliance with state and federal regulations.

Andrew N. Hamilton

Orange County Auditor-Controller

Andrew Hamilton is the 11th independently elected Orange County Auditor-Controller. Elected in 2022, he leads an office of more than 400 professionals responsible for safeguarding public funds and ensuring the County operates with financial accountability and transparency.

A Certified Public Accountant with nearly 35 years of public and private sector experience, Mr. Hamilton has served as various Controller and Accounting Management positions at publicly traded companies, a city finance director, a water district CFO, a member of the Lake Forest City Council, and accounting services for Fortune 500 companies.

Under his leadership, the Auditor-Controller’s Office oversees payroll for more than 18,000 County employees, financial reporting, property tax administration, and independent financial oversight that supports every County Department.

Mr. Hamilton was named as one of OC Register’s 125 Most Influential People in Orange County for 2025.

Executive Management

Learn more about our executive management team and their commitment to Orange County.

Division Directors

Meet our Division Directors who lead key operational areas.

Megan Vu

Megan Vu

Director of Central Accounting Operations

Megan Vu is the Director of Central Accounting Operations for the County of Orange Auditor-Controller’s department. She leads seven units – Claims and Disbursing, Cost Revenue and Budget,… Read more about Megan Vu

Admin Division Managers

Our Admin Division Managers ensure smooth operations across all departments.