Trinity Lutheran Christian School (Harford County, Maryland)

Clayton is an unincorporated community in Harford County, Maryland, United States. Clayton is located on Maryland Route 152, 4 miles (6.4 km) northwest of Edgewood.

Joppa ( JOP-ə) is a former colonial town and current planning region of Harford County, Maryland, United States. Joppa was founded as a British settlement on the Gunpowder River in 1707 and designated as the third county seat of Baltimore County in 1712. The original boundaries of Baltimore County were defined in 1659 and contained all of modern day Baltimore County, Baltimore City, Harford and Cecil counties and parts of Howard, Carroll, Anne Arundel and Kent counties. The settlement was named for the Biblical town of Jaffa in the ancient Holy Land of modern-day Israel. Joppa's harbor began to silt in due to clearcutting and farming upriver and coupled with multiple outbreaks of diseases such as smallpox and malaria, the county seat was moved to the growing, deep water port of Baltimore in 1768. Joppa's population would decline rapidly thereafter and businesses left for more prosperous environments in the new Baltimore Town.

Joppatowne is a census-designated place in southwestern Harford County, Maryland, United States. Serving as a bedroom community for nearby Baltimore, it was established in 1961 as a planned unit development (PUD). The population was 12,616 at the 2010 census, up from 11,391 in 2000. Joppatowne is covered by the "Joppa" ZIP Code of 21085, and "Joppa" is a designated planning region for Harford County. The Joppa ZIP code (21085) extends 6 miles (10 km) north of Joppatowne, as far as Benson, just south of Bel Air. The namesake of both Joppatowne and Joppa is the original town of "Joppa" (Jaffa, Israel). It was a major seaport in American colonial times and the county seat of the original Baltimore County until 1768. Its site is located within the boundaries of present-day Joppatowne.

Joppatowne High School is a high school in Joppatowne, Harford County, Maryland, United States.

Winters Run is a 14.6-mile-long (23.5 km) river in Harford County, Maryland. The river begins north of the community of Fallston at the confluence of the West and East Branches, and flows southeast about 11 miles (18 km) to Atkisson Dam in Bel Air. The dam and reservoir were built by the U.S. Army in 1942 to provide an auxiliary fresh water source for nearby Edgewood Arsenal. Upon reaching the tidal line, the river is renamed Otter Point Creek, which empties to Bush River and the Chesapeake Bay. The watershed area of Winters Run is about 56 square miles (150 km2).North of the dam is Harford Glen, an environmental study area owned by the Harford County Public Schools to provide environmental education to students around the county.

McComas Institute is a historic school located at Joppa, Harford County, Maryland, United States. The school was built in 1867, and is a one-story frame structure with a gable roof, five bays long and three bays wide, and resting on a stone foundation. It is one of three schools erected in the area by the Freedmen's Bureau after the Civil War.The McComas Institute was listed on the National Register of Historic Places in 1980.

Constant Friendship is an unincorporated community in Harford County, Maryland, United States.

Woodside is a historic home located at Abingdon, Harford County, Maryland. It has a 2+1⁄2-story main section, designed in 1823, that is an excellent example of a Federal side hall, double parlor plan house. The house is constructed of coursed fieldstone and ashlar. The property includes a stone house with overhanging gable roof, a hand pump, a shed-roofed frame storage building, an 1848 log barn, a 1928 frame corn crib, and three early 20th century garages.It was listed on the National Register of Historic Places in 1979.

Bradshaw is an unincorporated community in Baltimore County, Maryland, United States, located southeast of Kingsville.

Franklinville is an unincorporated community in Baltimore County, Maryland, United States. southeast of Kingsville.

The Gunpowder River is a 6.8-mile-long (10.9 km) tidal inlet on the western side of Chesapeake Bay in Maryland, United States. It is formed by the joining of two freshwater rivers, Gunpowder Falls (often referred to locally as "Big Gunpowder Falls") and Little Gunpowder Falls.

Harford Glen Environmental Education Center is a division of Harford County Public Schools and is involved in environmental and elementary education. The park, which is open to the public during the summer and on weekends is located on Winters Run. Harford Glen was also the host of the 13th annual Maryland Envirothon state level event in 2002.