Baltimore County is the third-most populous county in the U.S. state of Maryland and is part of the Baltimore metropolitan area. Baltimore County is part of the Northeast megalopolis, which stretches from Northern Virginia northward to Boston. Baltimore County hosts a diversified economy, with particular emphasis on education, government, and health care. As of the 2020 census, the population was 854,535.
Anne Arundel County, also notated as AA or A.A. County, is located in the U.S. state of Maryland. As of the 2020 United States census, its population was 588,261, an increase of just under 10% since 2010. Its county seat is Annapolis, which is also the capital of the state. The county is named for Lady Anne Arundell, a member of the ancient family of Arundells in Cornwall, England, and the wife of Cecilius Calvert, 2nd Baron Baltimore (1605–1675), founder and first lord proprietor of the colony Province of Maryland.
Somerset County is the southernmost county in the U.S. state of Maryland. As of the 2020 census, the population was 24,620, making it the second-least populous county in Maryland. The county seat is Princess Anne.
Arnold, a census-designated place (CDP) in Anne Arundel County, Maryland, United States, located just outside of the state's capital, Annapolis. It is located 18.78 miles south of Baltimore, and 29.97 miles east of Washington, D.C. The population was 23,106 at the 2010 census. Neighborhoods straddle College Parkway and Maryland Route 2. Arnold is located on the scenic Broadneck Peninsula. The ZIP code is 21012. It is bordered by Severna Park to the northwest, Cape Saint Claire to the southeast, Annapolis to the southwest, and Lake Shore to the northeast.
Brooklyn Park is a census-designated place (CDP) in Anne Arundel County, Maryland, United States. The population was 14,373 at the 2010 census.
Mayo is a census-designated place (CDP) in Anne Arundel County, Maryland, United States. The population was 8,298 at the 2010 census. The Mayo CDP of 2010 includes all of the area that used to be counted as the Selby-on-the-Bay CDP. The beach in Mayo used to be a popular weekend resort.
Pasadena is a census-designated place (CDP) in Anne Arundel County, Maryland, United States. The population was 24,287 at the 2010 census.
Arbutus is an unincorporated community and a census-designated place in Baltimore County, Maryland, United States. The population was 20,483 at the 2010 census. The census area also contains the communities of Halethorpe and Relay, in which all three names were used during the 1960 census when the area had a population of 22,402.
Lusby is an unincorporated community and census-designated place (CDP) in Calvert County, Maryland, United States. The population of the CDP was 1,835 at the 2010 census. Residents of the Chesapeake Ranch Estates and Drum Point communities also use the Lusby ZIP code designation.
Owings is a town center and census-designated place (CDP) in northern Calvert County, Maryland, United States. The population was 2,149 at the 2010 census, up from 1,325 in 2000.
Prince Frederick is an unincorporated community and census-designated place (CDP) in Calvert County, Maryland, United States. As of the 2020 census, the population of Prince Frederick was 3,226, up from 2,538 in 2010. It is the county seat of Calvert County.
Solomons, also known as Solomons Island, is an unincorporated community and census-designated place (CDP) in Calvert County, Maryland, United States. The population was 2,368 at the 2010 census, up from 1,536 in 2000. Solomons is a popular weekend destination spot in the Baltimore–Washington metropolitan area.
Edgewood is an unincorporated community and census-designated place (CDP) in Harford County, Maryland, United States. The population was 25,562 at the 2010 census, up from 23,378 in 2000.
Elkridge is an unincorporated community and census-designated place (CDP) in Howard County, Maryland, United States. The population was 15,593 at the 2010 census. Founded early in the 18th century, Elkridge is adjacent to two other counties, Anne Arundel and Baltimore.
The Patuxent River is a tributary of the Chesapeake Bay in the state of Maryland. There are three main river drainages for central Maryland: the Potomac River to the west passing through Washington, D.C., the Patapsco River to the northeast passing through Baltimore, and the Patuxent River between the two. The 908-square-mile (2,352 km2) Patuxent watershed had a rapidly growing population of 590,769 in 2000. It is the largest and longest river entirely within Maryland, and its watershed is the largest completely within the state.
The Patapsco River mainstem is a 39-mile-long (63 km) river in central Maryland that flows into the Chesapeake Bay. The river's tidal portion forms the harbor for the city of Baltimore. With its South Branch, the Patapsco forms the northern border of Howard County, Maryland. The name "Patapsco" is derived from the Algonquian pota-psk-ut, which translates to "backwater" or "tide covered with froth."
Baltimore Highlands is a census-designated place (CDP) in Baltimore County, Maryland, United States, directly south of the city of Baltimore. The population was 7,019 at the 2010 census. At the 2000 census and earlier, the area was delineated as part of the Lansdowne-Baltimore Highlands CDP.
Ilchester is an unincorporated community and census-designated place in Howard County, Maryland, United States. The population was 23,476 at the 2010 census. It was named after the village of Ilchester in the English county of Somerset.
Fort Howard was a military installation located on the North Point peninsula, overlooking the main channel of the Patapsco River leading into the harbor of Baltimore, Maryland, USA. Although militarily important since the early 19th century, its surviving elements and name date to the Spanish–American War. It was named by Elihu Root, Secretary of War under President Theodore Roosevelt, in 1902 after Colonel John Eager Howard (1752–1827). The installation earned the nickname the "Bulldog at Baltimore's Gate", serving as the coastal artillery headquarters for Baltimore, Maryland. Fort Howard's historical significance is its military connection with the War of 1812, the Spanish–American War, and World War II.
Fort Smallwood Park is a county park in northeastern Anne Arundel County near Riviera Beach and Pasadena, Maryland, United States. It is located on the outer Patapsco River as it meets the Chesapeake Bay.
United States
Maryland 
Baltimore 
