Office of the Nassau County Executive, the chief administrator of county government responsible for law enforcement, planning, consumer protection, roads, parks and recreation, and preparation of the county budget.

Nassau County Department of Health

Executive Nassau

Nassau County Department of Health, providing public health services including disease prevention, environmental health, emergency preparedness, and community health programs.

Nassau County Sheriff's Office

Public_safety Nassau

Nassau County Sheriff's Office responsible for corrections, civil enforcement, courthouse security, and prisoner transport.

Nassau County District Attorney's Office

Judicial Nassau

Office of the Nassau County District Attorney, responsible for the prosecution of crimes committed in Nassau County.

Nassau County Clerk's Office

Executive Nassau

Office of the Nassau County Clerk, responsible for recording and maintaining legal documents, issuing licenses, and serving as clerk of the county courts.

Nassau County Department of Public Works

Executive Nassau

Nassau County Department of Public Works, responsible for road maintenance, traffic engineering, mosquito control, and county infrastructure.

Nassau County Department of Social Services

Executive Nassau

Nassau County Department of Social Services, providing public assistance, child welfare, adult protective services, and other social safety net programs.

Nassau County Legislature

Legislative Nassau

The legislative branch of Nassau County government, consisting of 19 members representing individual districts, responsible for enacting local laws, approving the county budget, and providing oversight of county operations.

Nassau County Police Department

Public_safety Nassau

Primary law enforcement agency for Nassau County, providing police services to unincorporated areas and villages that contract for police services.