Frederick County was created in 1748 from parts of Prince
George's County and Baltimore County.
In 1776, Frederick County was divided into three parts.
The westernmost portion became Washington County, named after George
Washington, the southernmost portion became Montgomery County, named
after another Revolutionary War general, Richard Montgomery. The
northern portion remained Frederick County.
In 1837 a part of Frederick County was combined with a
part of Baltimore County to form Carroll County which is east of
current day Frederick County.
12 E Church St
Frederick, MD 21701-5437
County Seat: Frederick
County Organized: 1748
Square Miles: 660.22
1. Adams Co., PA (north)
2. Carroll County (east)
3. Howard County (southeast)
4. Franklin County, PA (northwest)
5. Montgomery County (south)
6. Washington County (west)
7. Loudoun County, VA (southwest)