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	297
2	Swan Harbor Farm	Harford	275
3	C&O Canal – Violette’s Lock	Montgomery	273
4	Loch Raven Reservoir & Watershed	Baltimore County	272*
5	North Point State Park	Baltimore County	271*
6	Masonville Cove Environmental Education Center	Baltimore City	266
7	Fort McHenry National Monument	Baltimore City	265
8	McKee-Beshers Wildlife Management Area (Hughes Hollow)	Montgomery	252
9	Piney Run Park and Nature Center	Carroll	244
Tied for 10	Elk Neck State Park	Harford	243*
Tied for 10	Triadelphia Reservoir – Howard County Portion	Howard	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 or City	# of Species
1	Assateague Island National Seashore and Assateague State Park	Worcester	349*
2	Deal Island WMA	Somerset	298*
3	Blackwater National Wildlife Refuge	Dorchester	292*
4	Eastern Neck National Wildlife Refuge	Kent	273*
Tied for 5	Irish Grove MOS Sanctuary	Somerset	256*
Tied for 5	Poplar Island	Talbot	256
Tied for 6	Pickering Creek Audubon Center	Talbot	252
Tied for 6	Terrapin Nature Park	Queen Anne’s	252
7	Chesapeake Bay Environmental Center – Horsehead	Queen Anne’s	248
8	Elliott Island Road	Dorchester	245*
9	Truitt’s Landing	Worcester	243*
10	Ocean City-Sunset Park	Worcester	238

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	299
3	Swan Creek Wetlands – Cox Creek Dredged Material Containment Facility	Anne Arundel	282
4	Fort Smallwood Park	Anne Arundel	269
5	Jug Bay Wetlands Sanctuary	Anne Arundel	261*
6	North Beach (Marsh)	Calvert	257
7	Flag Ponds Nature Park	Calvert	243
8	Beltsville Agricultural Research Center (restricted access)	Prince George’s	242
Tied for 9	Piscataway (National) Park	Prince George’s	237*
Tied for 9	Schoolhouse Pond	Prince George’s	237
10	Merkle NRMA	Prince George’s	234*

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	256
2	C&O Canal – North Branch Recreational Area	Allegany	233
3	Rocky Gap State Park	Allegany	225*
4	Broadford Lake	Garrett	220
5	Piney Reservoir	Garrett	216
6	Trout Run WWTP	Garrett	214
7	Fort Frederick State Park – Big Pool	Washington	212*
8	Youghiogheny River Reservoir – Old Morgantown Road	Garrett	207*
9	C&O Canal Terminus	Allegany	204
10	Herrington Manor State Park	Garrett	202*

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	259
2	Kenilworth Park and Aquatic Gardens	Washington, DC	250
3	Rock Creek Park	Washington, DC	221*
4	Theodore Roosevelt Island	Washington, DC	214
5	National Arboretum	Washington, DC	209*
6	C&O Canal – Fletcher’s Cove and Boathouse	Washington, DC	204
7	Kingman Island South – Kingman Lake/Heritage Island – see Anacostia Park for description	Washington, DC	200
8	Constitution Gardens & Reflecting Pool	Washington, DC	198
9	West Potomac Park – Tidal Basin	Washington, DC	193
10	Anacostia Park	Washington, DC	188