Frederick County is Maryland's largest county in size -- 663 square miles. The City of Frederick, the county seat, is intersected by five interstate and national highways that provide easy access to Baltimore (46 miles), Washington, D.C. (43 miles), Gettysburg, Pa. (32 miles), Harpers Ferry, W.Va. (21 miles), and Leesburg, Va. (25 miles). It is home to the 5,700-acre Catoctin National Park, site of the Camp David Presidential Retreat.

Frederick County is also Maryland's largest dairy producer, providing one-third of the state's milk production. 
  Frederick County's 9,000 businesses employ 91,000 workers; an estimated 98% of these businesses have under 100 workers, demonstrating that small business is the backbone of our economy. Frederick County boasts major employers including Bechtel, Lonza, Fannie Mae, Fort Detrick, MedImmune, and State Farm Insurance all with at least 500 employees and more. The county has experienced a significant increase in high-tech and bioscience companies, allowing more residents to work near where they live.  

Here are some quick links to demographic, population (236,745 as of July 2011), and census information related to Frederick County and its municipalities

Frederick County Maryland Government "At a Glance"

The City of Frederick

Frederick County Demographic & Development Data 

Frederick County Business Development & Retention Department

Maryland Department of Business & Economic Development "Facts & Stats"

Maryland Department of Business & Economic Development "Brief Economic Facts"

U.S. Census "Quick Facts - State & County"