St. Clement's Island State Park

The Blackistone Island Light was a lighthouse located on what is now St. Clement's Island on the Potomac River in Maryland. It is best known as the target of a Confederate raid in the Civil War. Completed in 1851, the structure was destroyed by fire in 1956 and its shell was razed; a replica was completed in 2008. The lighthouse replica can be visited on weekends from June through October. After driving to the St. Clement's Island Museum, one may take a water taxi on weekends and walk the grounds. A 50-foot (15 m) cross is also on the island. The lighthouse is open on Saturdays and the first Sunday of every month from June through October.

Coltons Point is an unincorporated community in what is popularly called the "Seventh District" of St. Mary's County, Maryland, United States. A small historical museum and a lighthouse are located there. Seasonal boat service carry visitors the short distance to the shrinking, uninhabited St. Clement's Island, where in 1634 the first European settlers arriving in Maryland landed and celebrated the first Catholic Mass in English-speaking North America. It was listed on the National Register of Historic Places in 1972. The ZIP Code for Coltons Point is 20626. The miraculous medal monument shown below has been moved to the property of a church in Mechanicsville.

Heron Island is a sandbar located in the Potomac River east-north-east of Saint Clement's Island in St. Mary's County, Maryland, United States. The closest town is Colton's Point, Maryland, 1⁄2 mile to the north. The island is named for the large numbers of herons seen by the European colonists when they arrived in 1634.

Abell is an unincorporated community in what is familiarly called the "Seventh District" of St. Mary's County, Maryland, United States. Abell was a brewing ground for many fisherman and farmers in the late 19th century until approximately the late 1950s. Abell was known for its many major ports, and for its deep water access which made it easy for large steamboats to maneuver. Many of the ports have been demolished due to storms and hurricanes. Today, some local fisherman still reside in the same area where they were raised. Abell is also known for its century-old homes and views of the St. Clements Bay.

Avenue is an unincorporated community in what is familiarly called the "Seventh District" of St. Mary's County, Maryland, United States.

Newtowne Neck State Park is a public recreation area located four miles (6.4 km) southwest of Leonardtown in St. Mary's County, Maryland. The state park sits on a peninsula that is surrounded by Breton Bay, St. Clements Bay, and the Potomac River. It is managed by the Maryland Department of Natural Resources.

The River View is a historic home located at Oakley, St. Mary's County, Maryland, United States. It is a 1+1⁄2-story, Flemish bond brick house that is one of the best preserved examples of its type in Lower Southern Maryland. It was built by the Gardiner family in the early 18th century, then purchased by Ignatius Fenwick, a prominent military figure in Maryland's Revolutionary War Navy. Also on the property are a number of early domestic dependencies that comprise the largest single collection of such buildings in St. Mary's County.The River View was listed on the National Register of Historic Places in 1976.

Oakley is an unincorporated community in St. Mary's County, Maryland, United States. The River View (a historic home located in Oakley) was listed on the National Register of Historic Places in 1976.

St. Francis Xavier Church and Newtown Manor House Historic District is the first county-designated historic district in Saint Mary's County, the "Mother County" of Maryland and is located in Compton, Maryland, near the county seat of Leonardtown. The district marks a location and site important in the 17th-century ecclesiastical history of Maryland, as an example of a self-contained Jesuit community made self-supporting by the surrounding 700-acre (2.8 km2) farm. The two principal historic structures were added to the National Register of Historic Places in 1972. Archaeological remains associated with the site date back to the early colonial period, mid-17th century.

Compton is an unincorporated community near Leonardtown in St. Mary's County, Maryland, United States. The St. Francis Xavier Church and Newtown Manor House Historic District where listed on the National Register of Historic Places in 1972. The ZIP Code for Compton is 20627.

The Cobb Point Bar Light (also called Cobb Island Bar Light) was a screw-pile lighthouse located in the Potomac River.

Bushwood is an unincorporated community in what is familiarly called the "Seventh District" of St. Mary's County, Maryland, United States. Ocean Hall was listed on the National Register of Historic Places in 1973. The ZIP Code for Bushwood is 20618.