U.S. States Bordering Water: 21 States with Ocean, Gulf, or Great Lakes Coastlines

Twenty-one U.S. states have direct water boundaries—ocean, gulf, or Great Lakes. This water access shapes their economies, ecologies, cultures, and strategic importance.

Pacific Ocean (5 States)

Alaska — 10,686 km coastline (Pacific + Arctic)
Washington — Pacific, Puget Sound, Strait of Juan de Fuca
Oregon — Pacific
California — Pacific
Hawaii — Entirely Pacific (only island state)

Atlantic Ocean (14 States)

Maine, New Hampshire, Massachusetts, Rhode Island, Connecticut, New York, New Jersey, Delaware, Maryland, Virginia, North Carolina, South Carolina, Georgia, Florida
(Note: NY, CT, RI, MA, NH, ME also border Long Island Sound / Gulf of Maine — Atlantic marginal seas.)

Gulf of Mexico (5 States)

Florida, Alabama, Mississippi, Louisiana, Texas
(FL and TX appear on both ocean lists — peninsular/coastal geometry.)

Great Lakes (8 States) — Freshwater Coastlines

Minnesota, Wisconsin, Illinois, Indiana, Michigan, Ohio, Pennsylvania, New York
(MI has longest freshwater coastline — 5,291 km. PA: 77 km on Lake Erie only.)

States with NO Water Border (29)

Arizona, Arkansas, Colorado, Idaho, Iowa, Kansas, Kentucky, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oklahoma, South Dakota, Tennessee, Utah, Vermont, West Virginia, Wyoming — plus 10 others fully interior.

Strategic Implications

Ports: 180+ major ports — gateways for 99% of overseas trade by volume.
EEZ: U.S. Exclusive Economic Zone (200 nm) — largest globally (11.4M km²) — driven by coastal states + territories.
Naval bases: Norfolk, San Diego, Pearl Harbor, Kings Bay, Bangor, Mayport — all in coastal states.
Climate vulnerability: Sea-level rise, hurricane surge, saltwater intrusion disproportionately affect these 21 states.