- Burns Paiute Indian Colony in Harney County
- Chewaucan (historical) in Lake County
- Comstock in Douglas County
- Cottage Grove, population 9,686 in Lane County
- Fields in Harney County
- Five Corners in Lake County
- Fox Hollow (historical) in Lane County
- Gap in Lane County
- Gilchrist in Klamath County
- Harper, population 109 in Malheur County
- Hot Springs (historical) in Lake County
- Imperial (historical) in Deschutes County
- Indian Village in Harney County
- Jasper in Lane County
- Jordan Valley, population 181 in Malheur County
- Lakeside, population 1,699 in Coos County
- Lakeview, population 2,294 in Lake County
- Last Change Reservoir, a reservoir in Malheur County
- Last Creek, a stream in Lane County
- Last Lake, a lake in Lane County
- Lateral 197, a canal in Malheur County
- Latham in Lane County
- Latham Post Office (historical), a post office in Lane County
- Latigo Creek, a stream in Harney County
- Lava Creek, a stream in Douglas County
- Lava Reservoir, a reservoir in Malheur County
- Lava Ridge Reservoir, a reservoir in Malheur County
- Lava Sinks Reservoir, a reservoir in Malheur County
- Lava Well, a well in Malheur County
- Laverne Falls, an overfalls in Coos County
- Lawen in Harney County
- Lawen Post Office, a post office in Harney County
- Lawhorne Creek, a stream in Coos County
- Lawrence Reservoir, a reservoir in Douglas County
- Lawson Bar, a bar in Douglas County
- Layne Creek, a stream in Lane County
- Layng Creek, a stream in Lane County
- Lazy Creek, a stream in Josephine County
- Lazy Man Reservoir, a reservoir in Harney County
- Leader Post Office (historical), a post office in Multnomah County
- Leaky Reservoir, a reservoir in Malheur County
- Leapfrog Creek, a stream in Lane County
- Leary Lake, a plain in Harney County
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- Leatherwood Rapids, a rapids in Douglas County
- Ledge Rock Reservoir, a reservoir in Malheur County
- Lee Adkins Place in Klamath County
- Lee Creek, a stream in Douglas County
- Lee Morris Spring, a spring in Harney County
- Lee Post Office (historical), a post office in Coos County
- Lee Thomas Crossing in Lake County
- Lee Thomas Meadow, a plain in Lake County
- Lee Thomas Recreation Site in Lake County
- Lee Valley, a valley in Coos County
- Leehmann Ranch in Lake County
- Leehmann Reservoir, a reservoir in Harney County
- Leehmann Well, a well in Lake County
- Lees Creek, a stream in Douglas County
- Left Fork Frozen Creek, a stream in Douglas County
- Lefty Creek, a stream in Lane County
- Legal Waterhole, a reservoir in Lake County
- Lehman Meadow, a plain in Harney County
- Lemolo Canal Number 1, a canal in Douglas County
- Lemolo Falls, an overfalls in Douglas County
- Lemolo Forebay, a reservoir in Douglas County
- Lemolo Lake, a reservoir in Douglas County
- Lemolo Lake Resort in Douglas County
- Lemolo Number 2 Canal, a canal in Douglas County
- Lemolo Number 2 Forebay, a reservoir in Douglas County
- Lemolo Powerplant Number 2, a building in Douglas County
- Lemolo Two Forebay Recreation Site in Douglas County
- Lems Spring, a spring in Harney County
- Leneve Post Office (historical), a post office in Coos County
- Leona Post Office (historical), a post office in Douglas County
- Leonard Creek, a stream in Lake County
- Leonard Slough, a stream in Klamath County
- Leppy Reservoir, a reservoir in Malheur County
- Leppy Springs, a spring in Harney County
- Lequerica Trap, a depression in Malheur County
- Leslie Gulch, a valley in Malheur County
- Leslie Gulch Camp in Malheur County
- Lethas Spring, a spring in Harney County
- Letitia Cemetery in Douglas County
- Letitia Creek, a stream in Douglas County
- Letz Creek, a stream in Lane County
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