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Place
- Oahu1
- Oakland3
- Oakland Hills in the vicinity of Redwood Peak1
- Oaxaca1
- Ocala National Forest1
- Ohio10
- Ohio and Pennsylvania1
- Ohmer Creek Campground, Mitkof Island, south of Petersburg1
- Oilwell Bog, Puslinch Twp., mid-way between Guelph and Cambridge1
- Okaloosa2
- Oktibbeha1
- Old City Cemetery1
- Old John Lake, Brooks Range1
- Oldman River Watershed, 1 mile west of Avion Ridge, Castle River Valley1
- Oldman River Watershed; beside Lost Lake Trail, between Snowshoe Warden Cabin and Castle River Divide Junction, Waterton Lakes NP1
- Olga Bay1
- Olympic National Park, Lake Crescent, at base of Marymere Falls1
- On St. Peter Sand Stone Ledge, Pikes Peak1
- On a mountain near Columbia Falls1
- On bank of Cache la Poudre River, Big South Trail, 2 miles ENE of Chambers Lake1