NPS source records in Maryland.
Maryland has 27 records in our combined NPS metadata and visitor-statistics registry: 6 Parks · 4 Others · 3 National Historic Trails · 3 National Historical Parks · 3 National Historic Sites · 2 National Battlefields · 2 National Scenic Trails · 1 National Seashore · 1 Parkway · 1 National Monument and Historic Shrine · 1 Memorial Parkway. This is a source-record count, not the Park Service's official system-unit census. Combined 5-year-average annual visits: 22,539,712 (multi-state units count their full visits in every state they touch, see methodology). The most-visited record is George Washington Memorial Parkway at about 7.03M annual visits.
Marker positions are each unit's official NPS coordinates. State outline: U.S. Census cartographic boundary (public domain). Independent site, not affiliated with the National Park Service.
| Unit | Designation | 5-yr avg visits | Busiest month |
|---|---|---|---|
| George Washington Memorial Parkway | Memorial ParkwayGWMP | 7,025,042 | August |
| Appalachian National Scenic Trail | National Scenic TrailAPPA | 6,215,118 | July |
| Chesapeake & Ohio Canal National Historical Park | National Historical ParkCHOH | 4,552,595 | September |
| Assateague Island National Seashore | National SeashoreASIS | 2,392,510 | July |
| Fort Washington Park | ParkFOWA | 496,919 | July |
| Catoctin Mountain Park | ParkCATO | 448,938 | October |
| Harpers Ferry National Historical Park | National Historical ParkHAFE | 434,030 | October |
| Fort McHenry National Monument and Historic Shrine | National Monument and Historic ShrineFOMC | 296,240 | July |
| Piscataway Park | ParkPISC | 282,917 | July |
| Antietam National Battlefield | National BattlefieldANTI | 147,614 | September |
| Monocacy National Battlefield | National BattlefieldMONO | 125,986 | July |
| Greenbelt Park | ParkGREE | 76,887 | May |
| Hampton National Historic Site | National Historic SiteHAMP | 19,296 | May |
| Harriet Tubman Underground Railroad National Historical Park | National Historical ParkHATU | 14,913 | July |
| Clara Barton National Historic Site | National Historic SiteCLBA | 5,908 | August |
| Thomas Stone National Historic Site | National Historic SiteTHST | 4,799 | May |
| Baltimore-Washington Parkway | ParkwayBAWA | — | — |
| Captain John Smith Chesapeake National Historic Trail | National Historic TrailCAJO | — | — |
| Chesapeake Bay | —CBPO | — | — |
| Civil War Defenses of Washington | —CWDW | — | — |
| Fort Foote Park | ParkFOFO | — | — |
| Glen Echo Park | ParkGLEC | — | — |
| Harmony Hall | —HAHA | — | — |
| Oxon Cove Park & Oxon Hill Farm | —OXHI | — | — |
| Potomac Heritage National Scenic Trail | National Scenic TrailPOHE | — | — |
| Star-Spangled Banner National Historic Trail | National Historic TrailSTSP | — | — |
| Washington-Rochambeau Revolutionary Route National Historic Trail | National Historic TrailWARO | — | — |
Methodology
Rows come from our combined NPS metadata and Visitor Use Statistics registry, not the Park Service's official census of 433 managed system units. Per-record visit counts come from the official NPS Visitor Use Statistics Data Package, 2025; the "5-year average visits" column is the mean of 2021-2025 Recreation Visits. Multi-state records are listed under every state they touch, and their full visit total appears in each state. Official National Park counts use the central 63-park classification rather than the source designation label alone. Independent site, not affiliated with the National Park Service.
Independent site. Not affiliated with or endorsed by the National Park Service. Data comes from the official NPS Visitor Use Statistics Data Package, 2025; editorial analysis is ours. The NPS Arrowhead and other NPS marks are not used.