Asterisks indicate that the number of species shown is based on an aggregate for all hotspots within the park or refuge.

Only hotspots with public access are listed below.
Rank	Hotspot	County or City	# of Species
1	Hart-Miller Island State Park	Baltimore County	296
2	Swan Harbor Farm	Harford	274
3	C&O Canal – Violette’s Lock	Montgomery	272
4	Loch Raven Reservoir & Watershed	Baltimore County	269*
5	North Point State Park	Baltimore County	267*
6	Fort McHenry National Monument	Baltimore City	265
7	Masonville Cove Environmental Education Center	Baltimore City	258
8	McKee-Beshers Wildlife Management Area (Hughes Hollow)	Montgomery	250
9	Piney Run Park and Nature Center	Carroll	244
Tied for 10	Susquehanna State Park	Harford	241*
Tied for 10	Triadelphia Reservoir – Howard County Portion	Howard	241*

Asterisks indicate that the number of species shown is based on an aggregate for all hotspots within the park or refuge.

Only hotspots with public access are listed below.
Rank	Hotspot	County or City	# of Species
1	Assateague Island National Seashore and Assateague State Park	Worcester	347*
2	Blackwater National Wildlife Refuge	Dorchester	290*
3	Eastern Neck National Wildlife Refuge	Kent	266*
4	Deal Island WMA	Somerset	265*
5	Irish Grove MOS Sanctuary	Somerset	255*
Tied for 6	Pickering Creek Audubon Center	Talbot	251
Tied for 6	Terrapin Nature Park	Queen Anne’s	251
7	Poplar Island	Talbot	250
8	Chesapeake Bay Environmental Center – Horsehead	Queen Anne’s	245
9	Elliott Island Road	Dorchester	244*
10	Truitt’s Landing	Worcester	243*

Asterisks indicate that the number of species shown is based on an aggregate for all hotspots within the park or refuge.

Only hotspots with public access are listed below.
Rank	Hotspot	County	# of Species
1	Point Lookout State Park	St. Mary’s	306*
2	Sandy Point State Park	Anne Arundel	298
3	Swan Creek Wetlands – Cox Creek Dredged Material Containment Facility	Anne Arundel	281
4	Fort Smallwood Park	Anne Arundel	269
5	Jug Bay Wetlands Sanctuary	Anne Arundel	261*
6	North Beach (Marsh)	Calvert	253
Tied for 7	Beltsville Agricultural Research Center (restricted access)	Prince George’s	240
Tied for 7	Flag Ponds Nature Park	Calvert	240
8	Schoolhouse Pond	Prince George’s	236
Tied for 9	Merkle NRMA	Prince George’s	231*
Tied for 9	Piscataway (National) Park	Prince George’s	231*
10	Patuxent Research Refuge – South Tract (National Wildlife Visitor Center)	Prince George’s	228

Asterisks indicate that the number of species shown is based on an aggregate for all hotspots within the park or refuge.

Only hotspots with public access are listed below.
Rank	Hotspot	County or City	# of Species
1	Lilypons Water Gardens	Frederick	254
2	C&O Canal – North Branch Recreational Area	Allegany	233
3	Rocky Gap State Park	Allegany	223*
4	Broadford Lake	Garrett	217
5	Fort Frederick State Park – Big Pool	Washington	209*
6	Piney Reservoir	Garrett	206
7	Youghiogheny River Reservoir – Old Morgantown Road	Garrett	204*
8	C&O Canal Terminus	Allegany	201
9	Herrington Manor State Park	Garrett	199*
10	Indian Springs WMA	Washington	197*

Asterisks indicate that the number of species shown is based on an aggregate for all hotspots within the park or refuge.

Only hotspots with public access are listed below.
Rank	Hotspot	County or City	# of Species
1	East Potomac Park – Hains Point	Washington, DC	258
2	Kenilworth Park and Aquatic Gardens	Washington, DC	248
3	Theodore Roosevelt Island	Washington, DC	214
Tied for 4	C&O Canal – Fletcher’s Cove and Boathouse	Washington, DC	203
Tied for 4	National Arboretum	Washington, DC	203*
Tied for 4	Rock Creek Park	Washington, DC	203*
Tied for 5	Constitution Gardens & Reflecting Pool	Washington, DC	195
Tied for 5	Kingman Island South – Kingman Lake/Heritage Island – see Anacostia Park for description	Washington, DC	195
6	West Potomac Park – Tidal Basin	Washington, DC	189
7	Anacostia Park	Washington, DC	188
8	National Mall	Washington, DC	183
9	National Zoo	Washington, DC	179
10	Georgetown Reservoir	Washington, DC	176