- Macon1
- Maine1
- Marin1
- Marquette1
- Mifflin1
- Monroe1
- Mountain at Km 10, Guavate Purchase Unit, Sierra de Cayey1
- Mt. Le Conte1
- Mt. Moosilauke1
- Natural Bridge1
- Near Nestorville1
- Near Radio Station, Yakutat1
- Near summit of Rabun Bald1
- Northwest Territories1
- Ohio1
- Old Man's Cave, Benton Township, south-central part of sect. 11, ca. 6 mi. NE of south Bloomingville1
- Olympic Hot Springs1
- Olympic Hot Springs, Olympic National Forest, Olympic Peninsula1
- Olympic National Park, Hoh Valley, 1/4 mile west of Hoh Ranger Station1
- On Barren Island1