GIS Data - Maryland

Anne Arundel County, MD

Anne Arundel County is often referred to as AA or AA County. It's located in central Maryland and covers an area of 588 mi². Established in 1650, the area experiences an average of 44 inches of rain, 14 inches of snow, and 212 days of sunshine. It is the fourth most populous county in the state. Annapolis is the county seat.

Baltimore County, MD

Baltimore County covers an area of 682 mi². It is the third most populous county in the state with a population of 828,431, as of 2018. The county was established in 1659 and the county seat is currently located in Towson. The county was named after Cecil Calvert, the 2nd Baron Baltimore.

Howard County, MD

Howard County is located in central Maryland, and is known for excellent schools and generally high level of affluence. It encompasses an area of 253 mi² and has a population of 323,196 - making it the fifth most populous county in the state. Howard County was established in 1838 and named for John Eager Howard, a officer in the American Revolutionary War.

Montgomery County, MD

Montgomery County is located in central Maryland, covering an area of 507 mi². Established in 1776, it is the most populous county in the state. The county seat is located in Rockville, which is also referred to as “America in Miniature”. Montgomery County is one the wealthiest counties in the U.S. and is home to many major federal government office and research centers.

Prince George's County, MD

Prince George’s County was named for Prince George of Denmark and was established on April 23, 1696. Located in southern Maryland, it has an area of 499 mi². As of 2018, it was the second most populous county in the state with a population of 909,308. The county seat is located in Upper Marlboro.