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 NameOrder downstreamStateLocationunnamed island1Maryland?Okonoko Island2Maryland?unnamed islands3Maryland?unnamed island4Maryland?unnamed island5Maryland?unnamed island6Maryland?unnamed island7Maryland?Hancock Island8Maryland?unnamed island9Maryland?Sleepy Creek Islands10Maryland?unnamed island11Maryland?unnamed island12Maryland?Back Creek Island13Maryland?unnamed island14Maryland?unnamed island15Maryland?Duck Island16MarylandWashington County at Marlowe, West Virginiaunnamed island17Maryland?Shepherds Island18MarylandWashington County at Marlowe, West VirginiaKnott Island19MarylandWashington County near AntietamByrnes Island20MarylandWashington County at Harper's Ferry, West Virginiaunnamed island21Maryland?Colonial Island22MarylandFrederick County at KnoxvilleCatoctin Creek Island23Maryland?unnamed island24Maryland?Paton Island25MarylandFrederick County at Point of Rocksunnamed island26Maryland?Heaters Island27MarylandFrederick County at Point of RocksMason Island28MarylandFrederick CountyNolands Island29MarylandFrederick CountyMeadow Island30MarylandFrederick CountyBirdsaw Island31MarylandFrederick CountyCox Island32MarylandFrederick CountyMason Island33MarylandMontgomery CountyHarrison Island34MarylandMontgomery County near River Creek, VirginiaSelden Island35MarylandMontgomery County near Leesburg, VirginiaVan Deventer Island36MarylandMontgomery County near Leesburg, VirginiaTenfoot Island37MarylandMontgomery County near Leesburg, VirginiaSharpshin Island38MarylandMontgomery County near Sterling, VirginiaLowes Island39VirginiaLoudoun County near SterlingPond Island40MarylandMontgomery County near Blockhouse PointPatowmack Island41VirginiaFairfax County in Seneca Regional ParkElm Island42MarylandMontgomery County near Blockhouse PointGrapevine Island43MarylandMontgomery County near Blockhouse PointKatie Island44MarylandMontgomery County near Blockhouse PointTorpedo Island44MarylandMontgomery County near Pennyfield LockWatkins Island45MarylandMontgomery CountySycamore Island46MarylandMontgomery County Clagett Island47MarylandMontgomery County near Great Falls, VirginiaGladys Island48MarylandMontgomery CountyMinnehaha Island49MarylandMontgomery CountyBealls Island50MarylandMontgomery CountyPowhatan Island51MarylandMontgomery County near Great Falls, VirginiaConn Island52MarylandMontgomery County near Great Falls of the Potomac RiverOlmsted Island (formerly Great Falls Island)53MarylandMontgomery County at Great Falls of the Potomac RiverRocky Islands54MarylandMontgomery County in Great Falls ParkBear Island55MarylandMontgomery County at Great Falls ParkSherwin Island (formerly Cupid's Bower Island)56MarylandMontgomery County at Great Falls ParkOffutt Island57MarylandMontgomery CountyHermit Island58MarylandMontgomery County in the Chesapeake and Ohio Canal National Historical ParkPerry Island59MarylandMontgomery CountyHerzog Island60MarylandMontgomery County in the Chesapeake and Ohio Canal National Historical ParkTurkey Island (Maryland)61MarylandMontgomery County at the Yellow FallsVaso Island62MarylandMontgomery County in the Chesapeake and Ohio Canal National Historical ParkPlummers Island63MarylandMontgomery County near Cabin JohnDots Island64MarylandMontgomery County near Cabin JohnSwainson Island65MarylandMontgomery County near Cabin JohnWades Island66MarylandMontgomery County near Cabin JohnLangley Island67MarylandMontgomery County near Cabin JohnMinnie Island (Maryland)68MarylandMontgomery County near Cabin JohnCedar Island69MarylandMontgomery County at Glen EchoCabin John Island70MarylandMontgomery County at Glen EchoChatauqua Island71MarylandMontgomery County at Glen EchoRuppert Island72MarylandMontgomery County at Glen EchoSycamore Island73MarylandMontgomery CountySnake Island74MarylandMontgomery County at Little Falls DamHigh Island75MarylandMontgomery County at BrookmontThree Sisters76District of ColumbiaDistrict of ColumbiaTheodore Roosevelt Island77District of ColumbiaDistrict of ColumbiaLittle Island78District of ColumbiaDistrict of ColumbiaColumbia Island79District of ColumbiaDistrict of ColumbiaDaingerfield Island80VirginiaAlexandria, VirginiaGoose Island81District of ColumbiaDistrict of Columbia at the mouth of Oxon CreekRosilie Island82MarylandPrince George's County at the Woodrow Wilson Memorial BridgeHog Island83VirginiaFairfax County, Virginia at Wellington HeightsChopawamsic Island84VirginiaPrince William County at QuanticoCobb Island85MarylandCharles CountySaint Margaret Island (Maryland)86MarylandSt. Mary's CountyBullock Island87MarylandSt. Mary's County in St. Catherine SoundSaint Catherine Island88MarylandSt. Mary's County at St. Catherine SoundSaint Clement's Island89MarylandSt. Mary's CountySaint George Island90MarylandSt. Mary's CountyCraney Island?MarylandCharles CountyHarris Island?MarylandMontgomery CountyLock Island?MarylandMontgomery County in the Chesapeake and Ohio Canal National Historical Park
North Branch Potomac River NameOrder downstreamStateLocationLongs Island1Maryland?
South Branch Potomac River NameOrder downstreamStateLocationunnamed island1??unnamed island2??unnamed islands3??Piss Pot Island4West Virginia?Valley View Island5West Virginia?unnamed island6??unnamed island7??unnamed island8??unnamed island9??
See also List of islands of the United States List of islands of Maryland