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| AACC Astronomy Lab |  | | Observatory of Anne Arundel Community College, and home of the
AACC Astronomy Club. |
| ALPHA Observatory |  | | Observatory of Capitol Technology University. |
 | Alpha Ridge Park |  | | Observatory and star party site of the
Howard Astronomical League(HAL).
Park of Howard County.
Near Marriottsville, MD. |
| Ashton Observatory at Johnson Farms |  | | A private observatory of a member of the Howard Astronomical League. |
| Baltimore |  | | Home of the Baltimore Astronomical Society. |
| Bear Branch Nature Center |  | | A nature center and planetarium. Home to the Westminster Astronomical Society. |
| Beaver Creek Observatory |  | | An observatory of the Tri-State Astronomers. |
| Blackwater National Wildlife Refuge |  | | Centered on the Visitor Center of the
refuge. Home of public star nights held by the
Friends of Blackwater National Wildlife Refuge. |
| Bluebird Observatory |  | | A private observatory owned by Jerry Persall and open to visitors by appointment. |
| Bowie |  | | |
| Broad Creek |  | | A Memorial Scout Reservation used, with permission,
as a dark-sky site by the Harford County Astronomical Society. |
| Bunny Foo-Foo Observatory |  | | A private observatory in Fort Washington. |
| C&O Canal National Historical Park |  | | AKA Chesapeake and Ohio Canal National Historical Park. Near Clear Spring, between Hancock and Hagerstown. |
| Carr's Mill Park |  | | A park with no facilities,
occasionally used by the Howard Astronomical League for impromptu members-only events. In Howard county. |
| Catoctin Mountain Park |  | | Park, east of Hagerstown. |
| Chesapeake Beach Veterans Memorial Park |  | | City park in Chesapeake Beach. |
| Deep Creek Lake State Park |  | | State park. |
| Digital Monastery Observatory |  | | A private observatory near Frederick. |
| Dulaney Springs Park |  | | An observing site of the Baltimore County Casual Astronomers. Near Hampton. |
| Echo Hill Outdoor School |  | | A school near Worton. |
| Elk Forest |  | | A wildlife managment area used by the Delmarva Stargazers |
| Elliott Island road |  | | Centered on the parking lot of a boat launch on Elliot Island road. |
| Fishing Battery Island |  | | Used by some members of the Howard Astronomical League. Near Havre de Grace. |
| Fort Washington Park |  | | A historic national park in Fort Washington. |
| Frostburg |  | | "Home of the the Cumberland Astronomy Club and
Frostburg State University's planetarium. |
| GCAstro |  | | A private observatory. |
| Golden Mean Observatory |  | | A private observatory. |
| Greenbrier State Park |  | | State Park near Boonsboro. |
| Harford Community College Observatory |  | | Observatory of
Harford Community College. Also used by the
Harford County Astronomical Society. Near Bel Air. |
| Ladiesburg |  | | A town in Frederick County. |
| Little Bennett Regional Park |  | | A campground near Clarksburg |
| Little Levels Campground |  | | A backcountry camping area on
Assateague Island National Seashore.
|
| Marstown Observatory |  | | A private observatory near New Windsor. |
| Martin State Airport |  | | airport. |
| Middletown |  | | In Frederick county. |
| Montgomery County Astrophysical Observatory |  | | Aka MCAO, a private observatory, near Derwood. |
| Mount Airy Observatory |  | | A private observatory of a member of the Howard Astronomical League. |
| Mount Pleasant |  | | Part of the The Howard County Conservancy. |
| Nanjemoy Creek Observatory |  | | An observatory of the Southern Maryland Astronomical Society. |
| Ocean City |  | | |
| Point Lookout State Park |  | | State park where Chesapeak Bay and the Potomac join. |
| Potomac Astrometric Observatory |  | | A observatory for personal GRB and cataclysmic variable research |
| Prettyboy Reservoir |  | | A reservior surrounded by parkland. |
| Quiet Pond Observatory |  | | A private observatory of a member of the Amateur Astronomers Association of Princeton. |
| Reisterstown |  | | Home to the Soldiers Delight Natural Environment Area. |
| Rich Neck Observatory |  | | A private observatory. |
| Rocky Gap State Park |  | | State park near Cumberland. |
| Salisbury |  | | |
| Sola Virtus Observatory |  | | A private observatory somewhere around White Hall. |
| TBM Observatory |  | | A private observatory. |
| Tall Timbers |  | | A town in St. Mary's county. |
| The Hughesville Sky-view Observatory |  | | A private observatory near Waldorf. |
| Tuckahoe State Park |  | | A site of the Delmarva Stargazers |
| UMBC Observatory |  | | Observatory of
University of Maryland, Baltimore County. |
| United States Naval Academy |  | | Link.. In Annapolis. |
| University of Maryland Observatory |  | | Observatory of University of Maryland
Home of the National Capital Astronomers. in College Park. |
| Walgrove Observatory |  | | A private observatory in Reisterstown. |
| Willow Oak Observatory |  | | A private observatory somewhere around Gamber. |
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