Mill Green Historic District

The Scarboro Landfill is a controversial landfill in Harford County, Maryland in the United States. It is located on the property of the Harford Waste Disposal Center operated by the Harford County Government where a separate sanitary landfill is in use. An assessment of the landfills was carried out and confirmed the concerns raised by local residents. The now closed Scarboro Landfill is unlined, and it received municipal waste from 1956 until 1986. In the 1980s a number of wells had been drilled in the areas surrounding the landfill and were discovered to contain pollutants such as methylene chloride, toluene, ethylbenzene and other xylenes. A remediation program is being carried out and there is a recognised problem with volatile organic compounds.The Scarboro Conservation Area is nearby.

Deer Creek is a 52.9-mile-long (85.1 km) river in Maryland and Pennsylvania that flows through the scenic areas of Harford County and empties into the Susquehanna River, roughly halfway between the Interstate 95 bridge and Conowingo Dam. Its watershed area is 171 square miles (440 km2). Its watershed area in MD (excluding water) is 145 square miles (380 km2), with 3% impervious surface in 1994. It serves as a divider between the agricultural and urban/suburban areas of Harford County.

D. H. Springhouse is a historic springhouse located at Bel Air, Harford County, Maryland. It is a little gray stone building set into the base of a steep hill. This is a stone springhouse with a schoolroom above, 16.5 feet by 23 feet, with one narrow wall set into the bank over several fresh springs. It was built about 1816, and the quality of stonemasonry is notable.It was listed on the National Register of Historic Places in 1973.

Whiteford is an unincorporated community in Harford County, Maryland, United States. The community has historically had a strong Welsh heritage, which is reflected in the local architecture. The town, a part of the Whiteford-Cardiff Historic District, was added to the National Register of Historic Places in 2005. Until 1978, this community was served by the Maryland and Pennsylvania Railroad at milepost 42.4. Also on the National Register are the Broad Creek Soapstone Quarries and Slate Ridge School.The populated place Cambria lies to the northwest of Whiteford.

Slate Ridge School is a historic school located at Whiteford, Harford County, Maryland. The main block of the building is two stories, constructed of brick with a slate hip roof and a small wooden cupola in the center. It was built in 1912, and designed by the Baltimore architect Otto Simonson. A narrow hyphen containing a stairwell and corridor connects the main block to a similar two-story rectangular block and a one-story wing containing a stage and gymnasium, added just after World War II. It was used until about 1980.It was listed on the National Register of Historic Places in 1987.

Friends School of Harford is a co-ed K–8 independent private school guided by Quaker values located in Harford County, Maryland and was under the direction of Head of School, Jonathan Huxtable.Founded in 2005, it originated as a middle school located in the Deer Creek Friends Meeting House in Darlington, Maryland. The school moved in 2008 to The Highlands Commons Building in Street, Maryland, near Bel Air, Maryland. In 2009, the school expanded to include grades one through five. Expansion continued in the summer of 2010 with the addition of a new science lab. In 2012, Friends School of Harford welcomed a new Head of School, Clare Pitz. This change in administration coincided with the move to Friends School of Harford's location in Forest Hill, Maryland. Friends School of Harford is the only Friends school in Harford County, Maryland and is a member of the Friends Council on Education. Consistent with Friends School of Harford's commitment to Quaker values the school periodically sponsors community seminars on parenting and conflict-resolution.The school is supported by private donations, local Friends Meetings, equipment donations from local colleges and other private schools, as well as tuition. The school suspended operations for the 2018-2019 school year and is not accepting students.

Cambria is a populated place in Harford County, Maryland, northwest of Whiteford.Many slate quarries were in operation to the southeast of Cambria in the 1800s. The region was known as the Peach Bottom Slate area.

Whiteford–Cardiff Historic District is a national historic district at Cardiff and Whiteford, Harford County, Maryland, United States. It encompasses portions of two communities in northern Harford County that were historically associated with slate production during the late 19th and early 20th centuries. It contains 140 contributing resources including four vernacular Welsh cottages dating to about 1850. The Whiteford–Cardiff area is noted for its strong Welsh ethnic identity, which is reflected in the architecture of the area.It was added to the National Register of Historic Places in 2005.

Street is a rural unincorporated community in northern Harford County, Maryland, United States.One of the central villages in Street is Highland. The village had a station stop on the Maryland and Pennsylvania Railroad, at milepost 38.6, which served farms within the area until it ceased passenger service in 1954, then terminated freight service in 1958. The post office for Street, Maryland is located in the village of Highland. The village was once home to Highland High School, which later became Highland Elementary School. Highland Elementary School was shut down when the North Harford Elementary School was opened. The large building has other community purposes now, including the alternative Highlands School, Mason-Dixon Community Service, Highland Senior Center and the Street post office. The Habonim Dror Camp Moshava is also located in Street. The Col. John Streett House was listed on the National Register of Historic Places in 1973. Gladden Farm and Mill Green Historic District were listed in 1993.

Pylesville is an unincorporated community and census-designated place (CDP) in Harford County, Maryland, United States. The population was 693 at the 2010 census. It is part of the Baltimore metropolitan area.The town was named after Brandon Pyles. Until 1958, this community was served by the Maryland and Pennsylvania Railroad at milepost 40.3.

Cardiff is an unincorporated community in Harford County, Maryland, United States. The zip code for the area is 21160. The community name is taken from the Capital city of Wales.

Delta Historic District is a national historic district located at Delta in York County, Pennsylvania. The district includes 137 collective buildings, mostly constructed between 1875 and 1895. The buildings are primarily frame and clapboard structures set upon a slate foundation and topped with slate shingle roof. They are reflective of a number of popular architectural styles including the Greek Revival and Late Victorian style. The use of slate reflects the prominence of that industry on the local economy.It was listed on the National Register of Historic Places in 1983.