What Borders Pennsylvania? 6 States + 6 Water Bodies (Full List)

Pennsylvania sits in the Mid-Atlantic, a keystone linking Northeast, Midwest, and South. Its borders are a mix of colonial charters, river lines, and lake frontage.

🗺 Six Bordering States

StateBorder TypeKey Feature
New YorkNorth42nd parallel (mostly), Lake Erie corner
New JerseyEastDelaware River (entire length)
DelawareSoutheastDelaware River & Bay; famous “Twelve-Mile Circle” arc
MarylandSouthMason-Dixon Line (surveyed 1763–67)
West VirginiaSouthwestMountain ridges, split from VA in 1863
OhioWestOhio River (PA owns to low-water mark on OH side)

💧 Six Bordering Water Bodies

Water BodyRole
Delaware RiverForms entire PA–NJ border; tidal to Trenton
Delaware BayPA’s tiny SE corner touches it (via river mouth)
Atlantic OceanNo direct coastline — but tidal Delaware R. connects
Lake Erie51 mi shoreline (Erie County) — PA’s only Great Lake
Ohio RiverForms PA–WV & PA–OH borders; major barge corridor
Susquehanna RiverBisects state; largest river on East Coast draining to Atlantic

Fun Fact

PA’s southern border (Mason-Dixon) was the first scientifically surveyed intercolonial boundary — and became the cultural North/South divide.

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