Great Mills High School

Great Mills is an unincorporated community in St. Mary's County, Maryland, United States. Great Mills High School serves the lower end of the county, including the town (census CDP) of Lexington Park. The area is site of some of the oldest agricultural settlements in Maryland, as well as English speaking North America. It had many links to the original Maryland colony in St. Mary's City. It is also now a suburb of Lexington Park and the Patuxent River Naval Air Station.

Cecil's Mill Historic District is a national historic district in Great Mills, St. Mary's County, Maryland. It consists of four buildings: Cecil's Mill, Cecil Store, the Cecil Home, and Old Holy Face Church. Cecil's Mill is a 2+1⁄2-story wood-framed structure, that was used until 1959. Across from the mill is the store, house, and Holy Face Church. The store was constructed in the 1920s and is a good example of a rural store. The Cecil Home was constructed in the late 19th century. Old Holy Face Church is a 2+1⁄2-story frame church that was abandoned in the 1940s.It was added to the National Register of Historic Places in 1978.

Callaway is a census designated place in St. Mary's County, Maryland, United States. The elevation is 105 feet (32 m). Per the 2020 Census, the population was 1,779.

Lexington Park is a census-designated place (CDP) in St. Mary's County, Maryland, United States, and the principal community of the Lexington Park, Maryland Micropolitan Statistical Area. The population was 11,626 at the 2010 census.

St. Mary's River State Park is a public recreation area located in St. Mary's County, Maryland. The state park consists of two sites: one encompasses 250-acre (100 ha) St. Mary's Lake (an automated gate wants $3 for Marylanders, $5 for others); the second covers 2,200 acres (890 ha) and is largely undeveloped. The park is managed by the Maryland Department of Natural Resources.

Charlotte Hall Military Academy, located at Charlotte Hall, Maryland, was established as Charlotte Hall School in 1774 by Queen Charlotte to provide for the liberal and pious education of youth to better fit them for the discharge of their duties for the British Empire. It was fully accredited by the Maryland State Department of Education. The landed estate of the school embraced 360 acres (1.5 km2). The School was non-sectarian and of high moral tone. There were many illustrious graduates, persons of all major professions, clergy and congressmen. Trustees of the academy, formerly known as Charlotte Hall School, included Roger B. Taney (1777–1864) Supreme Court Justice, George Plater (1735–1792) Governor of Maryland, James Thomas (1785–1845) Governor of Maryland and Joseph Kent (1779–1837) Governor of Maryland.The School closed its doors in 1976 because of increasing financial problems. The property is now part of the Charlotte Hall Historic District. It is operated as the Charlotte Hall Veterans Home, a program of the Maryland State Department of Veterans Affairs.

St. Richard's Manor is a historic home located at Lexington Park, St. Mary's County, Maryland. It is a 1+1⁄2-story Flemish bond brick dwelling, with a steeply pitched gable roof, constructed before 1750 on the Patuxent River. Also on the property are two tobacco barns built about 1935, and a small pyramid-roofed concrete block pumphouse.On December 16, 1652, "St. Richard's Manor" was re-patented to Luke Gardiner, heir of Richard Gardiner, because the original patent had been lost as a result of the internal strife with Ingle in 1645. Shortly afterwards /_that is in the 1650s _/ Richard Edelen was contracted by Luke to build a second house on the Manor. This house is still standing today on fifty-five acres of the original land patent. Richard Edelen built a second house called "Riverview" (circa 1659) for Luke Gardiner near St. Clements Island. When bequeathing St. Richard's manor, Richard Keene stated "which was taken up in Luke Gardiner's name." This leads one to conclude that Luke Gardiner was given manorial rights and therefore when Richard Keene became possessed of the manor the rights and privileges of Court Baron became vested in Richard Keene as Lord of St. Richard's Manor.St. Richard's Manor was listed on the National Register of Historic Places in 1985.

Valley Lee is an unincorporated community in St. Mary's County, Maryland, United States. The St. George's Episcopal Church was listed on the National Register of Historic Places in 1973. Another landmark of Valley Lee is the 100-year-old Russells Store, a country store, barber/beautyshop, and local tavern. The ZIP Code for Valley Lee is 20692.

California is a census-designated place and community in St. Mary's County, Maryland, United States. The population was 11,857 at the 2010 census, an increase of 27.4% from the 2000 census. California has been growing with the spread of population from the older adjacent community of Lexington Park and the growth in both technology-related and defense-related jobs at the Patuxent River Naval Air Station. There are department stores and numerous shopping centers situated along Maryland Highway 235 ("Three Notch Road"). Maryland Route 4 crosses Highway 235 in California, providing access to the wide Governor Thomas Johnson Bridge and the popular weekend resort town of Solomons on its opposite side. Bridge-bound traffic is notorious for backing up during rush hour.

St. George's Episcopal Church is a historic church located at 44965 Blake Creek Road, in Valley Lee, St. Mary's County, Maryland, United States. It was built in 1799 on the same site as three other, earlier churches. It is a one-story, five-bay, rectangular, gable-front, Flemish bond brick structure. The interior has been restored to its 1884 appearance. The church is surrounded by a graveyard, enclosed by a low brick wall. It is generally believed that St. George's is the site of the oldest Anglican church in Maryland whose parish is still in existence. William and Mary Parish, as it was originally known, was one of the original 30 Anglican parishes in the Province of Maryland. The church was listed on the National Register of Historic Places in 1973.

St. Mary's Peninsula is part of the Western Shore region of Maryland. From the Charles County line, just north of Charlotte Hall, Maryland, to the southern tip of St. Mary's County at Point Lookout State Park, St. Mary's Peninsula stretches about 39 miles (63 km). It is bordered on the southwest by the Potomac River, on the north and east by the Patuxent River and on the east by Chesapeake Bay. From the end of these two rivers, the peninsula has about 15 miles of shoreline along the Bay's western shore from Lexington Park, Maryland to Point Lookout. Its shoreline stretches for a total of 536 miles along the Patuxent River, Potomac River and the Chesapeake Bay.Conterminous with the boundaries of St. Mary's County, the peninsula covers a land area of 361.25 square miles (935.6 km2).Northeast of St. Mary's Peninsula, on the opposite side of the Patuxent River, is the smaller Calvert Peninsula. Like St. Mary's Peninsula, Calvert Peninsula also has boundaries conterminous with a single Maryland county.

Hopewell is an unincorporated community in St. Mary's County, Maryland, United States. It lies at an elevation of seven feet (2 m).