Patapsco Valley State Park

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.

The Oaks is a historic home and slave plantation located in Ellicott City, Howard County, Maryland (considered Elkridge, near Ellicott's Mills when built). The house is situated on a land tract named Joshua's Addition patented in 1723 by Joshua Sewall fronting an Indian trail latter named Claggett Road. In 1778 Thomas Cockey sold the land to John Merriken. The land passed to Caleb Dorsey who sold it to the Hare family in 1840. The property featured a cedar tree walkway dated to 1789. An original eighteenth-century stone house was modified to a flat-roofed Italiante structure in 1856 by ship captain Robert H Hare, who also built and lived at the Linwood building. In 1864, Jehanne Elvira Hopkins moved from the South with her slaves and bought the land including Mt. Misery and Oeall Enlarged. A tenant house and slave quarters collapsed in the 1960s. On May 14, 2015, a fire broke out in the structure at 11 am.

Oella is a mill town on the Patapsco River in western Baltimore County, Maryland, United States, located between Catonsville and Ellicott City. It is a 19th-century village of millworkers' homes.

Mount Gilboa Chapel is a historic African Methodist Episcopal Church located in Oella, Maryland, United States. It is a small stone church measuring 28 feet by 42 feet, built about 1859 by free African Americans. The front façade is ashlar masonry, but the sides and rear are of rubble.

The Historical Ellicott City/Baltimore Trolley Line #9 Trail is a 1.25-mile (2.0 km) trail in western Baltimore County, Maryland. It begins at the west end of Edmondson Avenue and extends from Catonsville through Oella to Main Street, Ellicott City. The trail follows what was originally part of the Catonsville and Ellicott City Electric Railway Company trolley line that shuttled passengers between Ellicott City and Baltimore from the late 1890s to the mid-1950s.

Linwood is an unincorporated community in Howard County, Maryland, United States.

Linnwood, is a historic home located at Ellicott City, Howard County, Maryland, United States. It is a large 1901 Queen Anne-influenced house consisting of a 2+1⁄2-story four-bay by four-bay frame structure with vinyl siding, a rubble stone foundation, and a hip roof with asphalt shingles. Six domestic outbuildings are arrayed behind the house, including a springhouse/greenhouse, shop building/cold storage and annex, garage, smokehouse, privy, and a modern garage. A stone gateway with iron gates is located at the road, flanking the driveway. The house's Late Victorian form and appearance resulted from a thorough remodeling in 1901 of a preexisting farmhouse, according to designs by architect D. S. Hopkins.Linnwood was listed on the National Register of Historic Places in 2006.

Patapsco Female Institute (PFI) is a former girls' boarding school, now a partially rebuilt historical site, located on Church Road in Ellicott City, Maryland, United States. The grounds are home to popular outdoor theatrical performances by The Chesapeake Shakespeare Company. In the 1930s the Institute was also known as "Warwick".

Woodlawn or Papillon was amanor home in Ellicott City, Howard County, Maryland in the United States. Woodlawn was built by Thomas Beale Dorsey. The estate featured two entrances to avoid a toll on the old Frederick turnpike and a carriage house outbuilding. Between the 1880s and 1890s, it was the home of the Rodgers family (of Rodgers Avenue). Walter K. Plum of the American Oil Company named the estate Woodlawn Manor, the same name as an estate several miles westward. In 1947 the estate was the home of Dorsey Williams and Frances Lurman in 1947. In 1953 Dr. Allen Jones owned the property, followed by Keith Garret in 1970. In 1976 the owner attempted to convert the property to a motel. The estate was converted to a country inn. The property was owned in the 1970s by Investor's Developers inc, who subdivided the estate to 26 acres and converted the manor to the Pauvre Papillon restaurant serving French cuisine.Following the Ellicott City fire of 11 November 1984, the owner of the Chez Fernand Restaurant attempted to relocate to Papillon. The asking price at the time was $3 Million dollars, and the owner chose to move to Baltimore instead. The estate was razed for a development of 112 townhouses in 1995 by Security Development Corporation, a company founded by family members of former county Commissioner Norman E. Moxley, and Robert Moxley chief land purchaser for the Rouse Company project of Columbia. The Howard County Department of Planning and Zoning approved the permits but claimed not to be aware that the site was historic. Vice president Steve Breeden told the press that nobody would want to live in the historic mansion, especially after recent fire damage. Woodlawn was one of many historical buildings in the region with valuable real estate that was developed after a fire set to the structure, including Troy Hill (1990), Avondale Mill (1991), St. Mary's College (1997), Ammendale Normal Institute (1998), Phelps Log Cabin - Moved from North Laurel to Elkridge (2001). Henryton State Hospital (2007), (2011)

Ellicott's Mills Historic District is a national historic district at Oella, Baltimore County, Maryland, United States. It is on the east bank of the Patapsco River, opposite Ellicott City. This historic district designation relates to the industrial operations of the Ellicott family from the 1770s through the mid-19th century. It consists of the sites of historic buildings including: an 18th-century building, a section of an 18th-century mill incorporated in a 20th-century factory, a 19th-century tavern, 19th-century workers housing, and an 1859 Italianate villa built by John Ellicott. Historically, these industrious mills were served by the major east–west route in Maryland during the early 19th century, the old National Pike. Also in the district is the mammoth multi-story Wilkins-Rogers Company flour plant, which is located on the site of the 1792 Ellicott Flour Mill, the first merchant flour mill in the United States.It was added to the National Register of Historic Places in 1976.

Mt Ida is a historic home in Ellicott City, Howard County, Maryland. Mt. Ida was built for William Ellicott, grandson of one of the city's founding brothers, Andrew Ellicott in 1828. It was built by Charles Timanus, who was also the principal builder of the neighboring Patapsco Female Institute and the Howard County Courthouse. Judge John Snowden Tyson and family lived at the residence from the 1850s, with his daughter Ida Tyson, for whom the mansion is now named, remaining in the house until the age of 90 in the 1920s. Ownership passed hands again to John Ward Wilson, then the influential Clark Family Commissioner Charles E. Miller attempted to rezone the property to convert the mansion into office buildings in 1972. As of 2013, the mansion was owned by the Miller Land Company.

The Howard County Police Department (HCPD) is the primary law enforcement agency servicing 330,558 (20202) persons within the 254 square miles (660 km2) of Howard County, Maryland.