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- Oak Beach County Park
- Oakdale Avenue
- Oak Grove Beach
- Oak Hill Shores
- Oak Island - 10th Place West (S10D)
- Oak Island - 20th Place West (S10C)
- Oak Island - 29th Place East (S13C)
- Oak Island -30th Place West (S10A)
- Oak Island Beach - Middleton Public Access (S10B)
- Oak Island Beach-SE46th St. and E.Beach Drive (S13A)
- Oak Island Beach-southeast 58th St. and E. Beach (S13B)
- Oak Island-Caswell Beach (S15)
- Oak Island-Lighthouse Park, Caswell Beach (S15A)
- Oak Island Nature Center & Register Park (S42C)
- Oak Island - Ocean Crest Fishing Pier (S13)
- Oak Island Pier-Ocean Dr. and Keziah St. (S14A)
- Oak Island (S42D)
- Oak Island - Waterway Park (S42E)
- Oakland Beach
- Oakland Park Boulevard
- Oak Street Beach
- Oakwood
- Obear Park
- Ocean
- Ocean Ave (Cape May City)
- Ocean Avenue
- Ocean Beach at Paceco St
- Ocean Beach at Vicente St.
- Ocean Beach-Bay
- Ocean Beach Club
- Ocean Beach North @ Lincoln W
- Ocean Beach-Ocean
- Ocean Beach Park 1
- Ocean Beach Park 3
- Ocean Beach South @ Balboa
- Ocean Beach South @ Sloat Blvd
- Ocean @ Chilmark Pond Preserve
- Ocean Club Beach
- Ocean @ Edgartown Great Pond
- Ocean House
- Ocean Inlet Park
- Ocean Isle Beach - Chadbourn St. (S6)
- Ocean Isle Beach - Dawson Street (S5A)
- Ocean Isle Beach - Driftwood (S5B)
- Ocean Isle Beach - Greensboro St. (S6A)
- Ocean Isle Beach - Newport Street (S6B)
- Ocean Isle Beach Pier (S5)
- Ocean Isle - Soundside ICWW (S37)
- Ocean Isle - Wildlife Boat Ramp (S32A)
- Ocean @ Long Point
- Ocean @ Lucy Vincent Beach
- Ocean Marsh Rd. (TRI-068)
- Oceano Dunes State Recreation Area - North
- Oceano Dunes State Recreation Area (OCB11)
- Oceano Dunes State Recreation Area (OCB12)
- Ocean Park
- Oceanside Beach State Wayside
- Oceanside Pier
- Ocean @ Squibnocket Beach
- Ocean Street
- Ocean View Park
- Oceanview Way
- Ocracoke Campground (N42)
- Ocracoke (N41)
- Ocracoke (N41A)
- Ocracoke Village (N43)
- Ogden Dunes Beach
- Ohio Street Beach
- Oil Piers Beach
- Old Channel Beach
- Olde Severna Park
- Old Field Club
- Old Orchard Beach (Central)
- Old Orchard Beach (North End)
- Old Orchard Beach (Ocean Park)
- Old Shore Road Beach
- Old Silver Central (Residents)
- Old Silver North (Public)
- Old Silver South (Public)
- Old Woman Creek East
- Old Woman Creek West
- Oleta River State Park
- Olympic Sculpture Park
- Ona
- O'Neal Road
- Onekama Township Beach
- Onset
- Onslow Beach (C11)
- Onslow Beach (C21A)
- Ontario Beach Park
- Ontonagon Park
- Ontonagon Township Park and Campground
- Ophir
- Orange Beach Waterfront Park, Wolf Bay
- Orange Street Pier/Beach, Fairhope, Mobile Bay
- Orangetown STP Outfall
- Orchard Beach
- Orchard Beach
- Orchard Beach State Park
- Orchard St.
- Orchid
- Oregon Beach
- Oregon Dunes National Rec Area - South Jetty
- Oregon Inlet Coastguard Station (N24)
- Oregon Inlet Federal Campground (N23)
- Orient Beach State Park
- Ormond Beach - Arnold Road
- Ormond Beach - Industrial Drain
- Ormond Beach - J Street
- Oronto Bay 1
- Oronto Bay 2
- Oronto Bay 3
- Osborne
- Ossineke Beach
- Ossining Beach
- O St.
- Osterman Beach
- Oswald West State Park - Short Sand Creek at footbridge
- Otter Rock
- Otumba Park
- Outer Banks - Albacore Street (N84A)
- Outer Hook
- Oval Beach
- Overlook Beach
- Owen Little Way
- Owen Park
- Owens Beach / Point Defiance Park
- Owyhee River below Owyhee Dam
- Oxnard Bch. Park - Falkirk Avenue
- Oxnard Beach - 5th Street / Mandalay County Park
- Oxnard Beach - Outrigger Way
- Oxnard Beach Park - Starfish Drive
- Oyster Catcher Ct. (TRI-073)
- Oyster Harbor
- Oyster Point
- Oyster Pond
