# List of islands on the Potomac River

This is a list of islands on the Potomac River and its North and South branches. Because the Potomac belongs to Maryland, the majority of its islands lie within that state with some exceptions including portions located in the District of Columbia.

## Potomac River

| Name | Order downstream | State | Location |
| unnamed island | 1 | Maryland | ? |
| Okonoko Island | 2 | Maryland | ? |
| unnamed islands | 3 | Maryland | ? |
| unnamed island | 4 | Maryland | ? |
| unnamed island | 5 | Maryland | ? |
| unnamed island | 6 | Maryland | ? |
| unnamed island | 7 | Maryland | ? |
| Hancock Island | 8 | Maryland | ? |
| unnamed island | 9 | Maryland | ? |
| Sleepy Creek Islands | 10 | Maryland | ? |
| unnamed island | 11 | Maryland | ? |
| unnamed island | 12 | Maryland | ? |
| Back Creek Island | 13 | Maryland | ? |
| unnamed island | 14 | Maryland | ? |
| unnamed island | 15 | Maryland | ? |
| Duck Island | 16 | Maryland | Washington County at Marlowe, West Virginia |
| unnamed island | 17 | Maryland | ? |
| Shepherds Island | 18 | Maryland | Washington County at Marlowe, West Virginia |
| Knott Island | 19 | Maryland | Washington County near Antietam |
| Byrnes Island | 20 | Maryland | Washington County at Harper's Ferry, West Virginia |
| unnamed island | 21 | Maryland | ? |
| Colonial Island | 22 | Maryland | Frederick County at Knoxville |
| Catoctin Creek Island | 23 | Maryland | ? |
| unnamed island | 24 | Maryland | ? |
| Paton Island | 25 | Maryland | Frederick County at Point of Rocks |
| unnamed island | 26 | Maryland | ? |
| Heaters Island | 27 | Maryland | Frederick County at Point of Rocks |
| Mason Island | 28 | Maryland | Frederick County |
| Nolands Island | 29 | Maryland | Frederick County |
| Meadow Island | 30 | Maryland | Frederick County |
| Birdsaw Island | 31 | Maryland | Frederick County |
| Cox Island | 32 | Maryland | Frederick County |
| Mason Island | 33 | Maryland | Montgomery County |
| Harrison Island | 34 | Maryland | Montgomery County near River Creek, Virginia |
| Selden Island | 35 | Maryland | Montgomery County near Leesburg, Virginia |
| Van Deventer Island | 36 | Maryland | Montgomery County near Leesburg, Virginia |
| Tenfoot Island | 37 | Maryland | Montgomery County near Leesburg, Virginia |
| Sharpshin Island | 38 | Maryland | Montgomery County near Sterling, Virginia |
| Lowes Island | 39 | Virginia | Loudoun County near Sterling |
| Pond Island | 40 | Maryland | Montgomery County near Blockhouse Point |
| Patowmack Island | 41 | Virginia | Fairfax County in Seneca Regional Park |
| Elm Island | 42 | Maryland | Montgomery County near Blockhouse Point |
| Grapevine Island | 43 | Maryland | Montgomery County near Blockhouse Point |
| Katie Island | 44 | Maryland | Montgomery County near Blockhouse Point |
| Torpedo Island | 44 | Maryland | Montgomery County near Pennyfield Lock |
| Watkins Island | 45 | Maryland | Montgomery County |
| Sycamore Island | 46 | Maryland | Montgomery County |
| Clagett Island | 47 | Maryland | Montgomery County near Great Falls, Virginia |
| Gladys Island | 48 | Maryland | Montgomery County |
| Minnehaha Island | 49 | Maryland | Montgomery County |
| Bealls Island | 50 | Maryland | Montgomery County |
| Powhatan Island | 51 | Maryland | Montgomery County near Great Falls, Virginia |
| Conn Island | 52 | Maryland | Montgomery County near Great Falls of the Potomac River |
| Olmsted Island (formerly Great Falls Island) | 53 | Maryland | Montgomery County at Great Falls of the Potomac River |
| Rocky Islands | 54 | Maryland | Montgomery County in Great Falls Park |
| Bear Island | 55 | Maryland | Montgomery County at Great Falls Park |
| Sherwin Island (formerly Cupid's Bower Island) | 56 | Maryland | Montgomery County at Great Falls Park |
| Offutt Island | 57 | Maryland | Montgomery County |
| Hermit Island | 58 | Maryland | Montgomery County in the Chesapeake and Ohio Canal National Historical Park |
| Perry Island | 59 | Maryland | Montgomery County |
| Herzog Island | 60 | Maryland | Montgomery County in the Chesapeake and Ohio Canal National Historical Park |
| Turkey Island (Maryland) | 61 | Maryland | Montgomery County at the Yellow Falls |
| Vaso Island | 62 | Maryland | Montgomery County in the Chesapeake and Ohio Canal National Historical Park |
| Plummers Island | 63 | Maryland | Montgomery County near Cabin John |
| Dots Island | 64 | Maryland | Montgomery County near Cabin John |
| Swainson Island | 65 | Maryland | Montgomery County near Cabin John |
| Wades Island | 66 | Maryland | Montgomery County near Cabin John |
| Langley Island | 67 | Maryland | Montgomery County near Cabin John |
| Minnie Island (Maryland) | 68 | Maryland | Montgomery County near Cabin John |
| Cedar Island | 69 | Maryland | Montgomery County at Glen Echo |
| Cabin John Island | 70 | Maryland | Montgomery County at Glen Echo |
| Chatauqua Island | 71 | Maryland | Montgomery County at Glen Echo |
| Ruppert Island | 72 | Maryland | Montgomery County at Glen Echo |
| Sycamore Island | 73 | Maryland | Montgomery County |
| Snake Island | 74 | Maryland | Montgomery County at Little Falls Dam |
| High Island | 75 | Maryland | Montgomery County at Brookmont |
| Three Sisters | 76 | District of Columbia | District of Columbia |
| Theodore Roosevelt Island | 77 | District of Columbia | District of Columbia |
| Little Island | 78 | District of Columbia | District of Columbia |
| Columbia Island | 79 | District of Columbia | District of Columbia |
| Daingerfield Island | 80 | Virginia | Alexandria, Virginia |
| Goose Island | 81 | District of Columbia | District of Columbia at the mouth of Oxon Creek |
| Rosilie Island | 82 | Maryland | Prince George's County at the Woodrow Wilson Memorial Bridge |
| Hog Island | 83 | Virginia | Fairfax County, Virginia at Wellington Heights |
| Chopawamsic Island | 84 | Virginia | Prince William County at Quantico |
| Cobb Island | 85 | Maryland | Charles County |
| Saint Margaret Island (Maryland) | 86 | Maryland | St. Mary's County |
| Bullock Island | 87 | Maryland | St. Mary's County in St. Catherine Sound |
| Saint Catherine Island | 88 | Maryland | St. Mary's County at St. Catherine Sound |
| Saint Clement's Island | 89 | Maryland | St. Mary's County |
| Saint George Island | 90 | Maryland | St. Mary's County |
| Craney Island | ? | Maryland | Charles County |
| Harris Island | ? | Maryland | Montgomery County |
| Lock Island | ? | Maryland | Montgomery County in the Chesapeake and Ohio Canal National Historical Park |

## North Branch Potomac River

| Name | Order downstream | State | Location |
| Longs Island | 1 | Maryland | ? |

## South Branch Potomac River

| Name | Order downstream | State | Location |
| unnamed island | 1 | ? | ? |
| unnamed island | 2 | ? | ? |
| unnamed islands | 3 | ? | ? |
| Piss Pot Island | 4 | West Virginia | ? |
| Valley View Island | 5 | West Virginia | ? |
| unnamed island | 6 | ? | ? |
| unnamed island | 7 | ? | ? |
| unnamed island | 8 | ? | ? |
| unnamed island | 9 | ? | ? |