Origin: Frederick County was created in 1748 from Baltimore and Prince George's counties (Chapter 15, Acts of 1748). The County probably was named after Frederick Calvert (1731-1771), sixth and last Lord Baltimore, who was the Proprietor of Maryland from 1751 until his death in 1771 at Naples, Italy.

• Aging Dept.
• Community College
• County Government
• Economic Development Office
• Elections Board
• Health Dept.
• Human Resources Dept.
• Job Service
• Library
• Parks & Recreation Bureau
• Permits & Inspections Dept.
• Planning & Zoning Dept.
• Public Safety Division
• Public Schools
• Public Works Dept.
• Sheriff
• Social Services Dept.
• State's Attorney
• Transit Dept.