Carroll County is a county located in the U.S. state of Maryland. As of the 2020 census, the population was 172,891. Its county seat is Westminster. The county is part of the Central Maryland region of the state. Carroll County is included in the Washington-Baltimore-Arlington, DC-MD-VA-WV-PA Combined Statistical Area. While predominantly rural, the county has become increasingly suburban in recent years.
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.
Catonsville is a census-designated place (CDP) in Baltimore County, Maryland. The population was 44,701 at the 2020 US Census. The community is a streetcar suburb of Baltimore along the city's western border. The town is known for its proximity to the Patapsco River and Patapsco Valley State Park, making it a regional mountain biking hub. The town is also notable as a local hotbed of music, earning it the official nickname of "Music City, Maryland." Catonsville contains the majority of the University of Maryland, Baltimore County (UMBC), a major public research university with close to 14,000 students.
Sykesville is a small town in Howard and Carroll counties, Maryland, United States. The town lies 20 miles (32 km) west of Baltimore and 40 miles (64 km) north of Washington D.C. The population was 4,436 at the 2010 census. BudgetTravel.com named Sykesville 'Coolest Small Town in America' in June 2016.
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.
Ellicott City is an unincorporated community and census-designated place in, and the county seat of, Howard County, Maryland, United States. Part of the Baltimore metropolitan area, its population was 75,947 at the 2020 census, making it the most populous unincorporated county seat in the country.
Mount Airy is a town in Carroll and Frederick counties in the U.S. state of Maryland. It is part of both the Washington Metropolitan Area and Baltimore Metropolitan Area. As of the 2010 census the population was 9,288.
Lansdowne is a census-designated place in southern Baltimore County, Maryland, United States, located just south of Baltimore. As of the 2010 census, it had a population of 8,409. At the 2000 census and earlier, the area was delineated as part of the Lansdowne-Baltimore Highlands CDP.
Woodbine is an unincorporated rural community in Howard and Carroll counties, Maryland, United States. It is part of the Baltimore metropolitan area. It is located southeast of Frederick, west of Baltimore, north of Washington, D.C., and east of Mount Airy. The community was named for the woodbine plant, which grew in the community in fields and along riverbanks.
The Thomas Viaduct spans the Patapsco River and Patapsco Valley between Relay, Maryland and Elkridge, Maryland, USA. It was commissioned by the Baltimore and Ohio Railroad (B&O); built between July 4, 1833, and July 4, 1835; and named for Philip E. Thomas, the company's first president. Some claim it to be the world's oldest multiple arched stone railroad bridge. However, the Sankey Viaduct on the Liverpool and Manchester Railway was opened in 1830 and finally completed in 1833.
Maryland Route 99 is a state highway in the U.S. state of Maryland. Known as Old Frederick Road, the state highway runs 7.57 miles (12.18 km) from MD 32 near West Friendship east to U.S. Route 29 in Ellicott City. MD 99 parallels the north side of Interstate 70 (I-70) through a rural and suburban area in northeastern Howard County. MD 99, which follows the original 18th-century road west from Baltimore, was constructed as part of three state highways: MD 99, the original MD 100, and MD 105. All three highways were constructed between the early 1920s and early 1930s. MD 99 originally turned south along St. Johns Lane to US 40 and MD 144; in 1956, the state highway was rerouted along part of MD 100 and all of MD 105 to downtown Ellicott City. MD 99's eastern terminus was rolled back to US 29 in two steps in the late 1970s and late 1980s.
The Old Main Line Subdivision is a railroad line owned and operated by CSX Transportation in the U.S. state of Maryland. The line runs from Relay west to Point of Rocks, and was once the main line of the Baltimore and Ohio Railroad, one of the oldest rail lines in the United States. At its east end, it has junctions with the Capital Subdivision and the Baltimore Terminal Subdivision; its west end has a junction with the Metropolitan Subdivision.
Old Court Road is a state- and county-maintained highway in the U.S. state of Maryland. Including the adjacent road in Howard County known as Woodstock Road, the highway runs 15.4 miles (24.8 km) from Maryland Route 99 near Woodstock east to Joppa Road near Towson. Old Court Road includes two county-maintained sections and two Maryland state highways, Maryland Route 125 and Maryland Route 133. MD 125 has a length of 3.59 miles (5.78 km) between Woodstock and the edge of Randallstown and MD 133 spans 3.31 miles (5.33 km) between MD 129 and MD 25 in Pikesville. Old Court Road connects the western and central Baltimore County communities of Granite, Randallstown, Milford Mill, Pikesville, and Towson. Old Court Road has been a cross-county highway since the colonial era. The highway was fully paved in Baltimore County by the mid-1920s, including the sections of the highway that became MD 125 and MD 133. MD 133 was extended west to MD 140 and MD 125 was extended west to MD 99 in the early 1930s; MD 125's terminus returned to the Patapsco River in the mid-1950s. Old Court Road was relocated at its eastern end in the early 1960s and in Pikesville in the late 1960s, at which time MD 133 assumed its current course.
Fort Howard is an unincorporated community and census-designated place in Baltimore County, Maryland, United States. The population was 303 at the 2010 census. The median age is 47.9. 52.86% are female and 47.14% are male. 58.9% are married and 41.1% are single. The average household size is 2.64.
Daniels is a ghost town straddling the Patapsco River east of Woodstock and north of Old Ellicott City in Baltimore and Howard counties, Maryland, United States. It is the location of the Daniels Mill, a site listed on the National Register of Historic Places. Daniels is the home town of former Howard County Executive and State Senator James N. Robey. A postal office operated in the community from 1 March 1943 to 31 August 1971.
The Howard County Conservancy is a non-profit land trust that operates a nature center in Woodstock, Maryland. Founded in 1990, the center is located at the historic 300-year-old, 232-acre (0.94 km2) Mt. Pleasant Farm, and also maintains an additional nature center at the nearby Belmont Manor.
The Ellicott City Granodiorite is a Silurian or Ordovician granitic pluton in Howard and Baltimore Counties, Maryland. It is described as a biotite granodiorite along the margin of the intrusion which grades into a quartz monzonite in its core. It intrudes through the Wissahickon Formation and the Baltimore Gabbro Complex.
Peter Gorman was one of the first contractors of the Baltimore and Ohio Railroad. His son Arthur Pue Gorman would go on to become a Senator and pioneer in baseball. His other son William Henry Gorman would become a prominent businessman.
Woodmont Academy was a private school in Howard County, Maryland, affiliated with the Legionaries of Christ, a Catholic religious institute.
The Patapsco Valley is a small valley surrounding the Patapsco River in central Maryland. The region is known for its historical significance as a major economic and industrial center in the eighteenth and nineteenth centuries.
United States of America 
Maryland 
Howard 
