- Boulder Creek Recreation Site in Douglas County
- Boulder Reservoir, a reservoir in Malheur County
- Boulder Ridge, a ridge in Douglas County
- Boulder Rock in Douglas County
- Boulder Spring, a spring in Malheur County
- Boulder Spring Number 2, a spring in Malheur County
- Boulder Spring Trail in Lake County
- Boulder Waterhole, a reservoir in Lake County
- Boundary Campground in Coos County
- Boundary Creek, a stream in Lane County
- Boundary Lake, a plain in Lake County
- Boundary Picnic Ground, a park in Coos County
- Laura Creek, a stream in Douglas County
- Laurel Lake, a lake in Coos County
- Poor Farm in Harney County
- Poor Jug Well, a well in Lake County
- Poore Creek, a stream in Douglas County
- Pope Reservoir, a reservoir in Klamath County
- Pope Spring, a spring in Lake County
- Poplar Spring, a spring in Malheur County
- Poplars Ranch in Lake County
- Porcupine Canyon, a valley in Malheur County
- Porcupine Creek, a stream in Lake County
- Porcupine Flat, a plain in Lake County
- Porcupine Lake, a plain in Deschutes County
- Porcupine Reservoir, a reservoir in Malheur County
- Porcupine Spring, a spring in Harney County
- Porkchop Lake, a plain in Crook County
- Porphyry Spring, a spring in Coos County
- Port Orford Cedar Experimental Forest, a forest in Coos County
- Port Orford Cedar Forest State Park, a park in Curry County
- Port Orford Harbor, a harbor in Curry County
- Port Orford Heads State Park, a park in Curry County
- Port Orford Post Office, a post office in Curry County
- Riverton Boat Ramp, a park in Coos County
- School Land Bay, a bay in Coos County
- Soda Springs, a spring in Douglas County
- Temple Spring, a spring in Harney County
- Thomas Well, a well in Lake County
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- Timberline Lake, a lake in Klamath County
- Timon (historical) in Coos County
- Timon Post Office (historical), a post office in Coos County
- Timothy Creek, a stream in Lake County
- Timothy Ridge, a ridge in Douglas County
- Timothy Spring, a spring in Grant County
- Timothy Well, a well in Lake County
- Timpanogas Lake, a lake in Douglas County
- Timpanogas Recreation Site in Douglas County
- Tims Creek, a stream in Malheur County
- Tims Peak Reservoir, a reservoir in Malheur County
- Tims Peak Spring, a spring in Malheur County
- Tin Can Draw Reservoir, a reservoir in Malheur County
- Tin Can Reservoir, a reservoir in Malheur County
- Tin Can Ridge, a ridge in Harney County
- Tin Can Spring, a spring in Harney County
- Tin Trough Spring, a spring in Malheur County
- Tin Troughs Spring, a spring in Malheur County
- Tiny Creek, a stream in Lane County
- Tiny Lake, a lake in Lane County
- Tioga (historical) in Coos County
- Tioga Creek, a stream in Coos County
- Tioga Post Office (historical), a post office in Douglas County
- Tip Davis Creek, a stream in Douglas County
- Tip Top Spring, a spring in Harney County
- Tipsoo Creek, a stream in Klamath County
- Tipton Spring, a spring in Grant County
- Tiptop Post Office (historical), a post office in Lane County
- Tire Creek, a stream in Lane County
- Tired Horse Reservoir, a reservoir in Lake County
- Tituna Spit, a bar in Curry County
- Trail Flat, a plain in Harney County
- Tunnel Millrace, a canal in Lane County
- W B J Spring, a spring in Harney County
- Ward Drain, a canal in Malheur County
- West Fork Butte Creek Reservoir, a reservoir in Malheur County
- Wild Horse Basin, a depression in Malheur County
- Willow Camp Spring, a spring in Lake County
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