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Name	USGS Map	County	State	Region	Section
Obsidian Falls	North Sister (1997)	Lane	Oregon	sc	1
Odin Falls	Cline Falls (1962)	Deschutes	Oregon	cp	3
Ohanapecosh Falls (u)	Chinook Pass (1987 nl)	Pierce	Washington	mr	9
Ohanapecosh Park Falls 1-4 (u)	Mt Rainier East (1971 nl)	Pierce	Washington	mr	8
Olallie Creek Falls (u)	Chinook Pass (1987 nl)	Lewis	Washington	mr	8
Olney Falls	Wallace Lake (1989)	Snohomish	Washington	nc	11
Olympia Falls (u)	Tumwater (1997 ns)	Thurston	Washington	ol	16
Oneonta Falls	Multnomah Falls (1994)	Multnomah	Oregon	cg	3
Opal Creek Falls (u)	Tanner Butte (1994 nl)	Hood River	Oregon	cg	6
Otter Falls	Snoqualmie Lake (1982)	King	Washington	nc	3
Outlet Falls	Outlet Falls (1970)	Klickitat	Washington	gp	14
Outlet Falls (u)	Paulina Peak (1981 ns)	Deschutes	Oregon	cp	5
Ouzel Falls	Cave Falls (1989)	Teton	Wyoming	sr	10

13 names in this listing