Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Middle Falls | Falls | 201 | Clackamas | 45 17 42 N | 122 15 24 W |
| Middle Fishhole | Swamp | 1610 | Klamath | 42 12 60 N | 120 53 33 W |
| Middle Fork Annie Creek | Stream | | Klamath | 42 50 16 N | 122 07 44 W |
| Middle Fork Ash Creek | Stream | | Polk | 44 51 31 N | 123 13 12 W |
| Middle Fork Beaver Creek | Stream | | Multnomah | 45 29 19 N | 122 21 09 W |
| Middle Fork Berry Creek | Stream | | Benton | 44 42 56 N | 123 18 06 W |
| Middle Fork Big Sheep Creek | Stream | | Wallowa | 45 10 41 N | 117 07 10 W |
| Middle Fork Brummit Creek | Stream | | Coos | 43 10 46 N | 123 49 38 W |
| Middle Fork Burnt River | Stream | | Baker | 44 30 26 N | 118 13 01 W |
| Middle Fork Calapooya Creek | Stream | | Douglas | 43 28 30 N | 122 59 53 W |
| Middle Fork Camp Creek | Stream | | Crook | 43 57 33 N | 120 15 08 W |
| Middle Fork Canyon Creek | Stream | | Grant | 44 12 45 N | 118 50 43 W |
| Middle Fork Catching Creek | Stream | | Coos | 42 59 45 N | 124 13 09 W |
| Middle Fork Catherine Creek | Stream | | Union | 45 09 08 N | 117 37 04 W |
| Middle Fork Cedar Creek | Stream | | Marion | 44 55 54 N | 122 35 44 W |
| Middle Fork Clark Creek | Stream | | Union | 45 30 43 N | 117 49 36 W |
| Middle Fork Cold Springs Canyon | Valley | | Umatilla | 45 52 22 N | 118 55 58 W |
| Middle Fork Copeland Creek | Stream | | Klamath | 42 56 51 N | 122 14 21 W |
| Middle Fork Coquille River | Stream | | Coos | 43 02 01 N | 124 07 01 W |
| Middle Fork Corral Creek | Stream | | Clackamas | 45 17 55 N | 122 51 05 W |
| Middle Fork Cottonwood Creek | Stream | | Umatilla | 45 57 19 N | 118 12 46 W |
| Middle Fork Coyote Creek | Stream | | Lane | 44 02 44 N | 123 16 59 W |
| Middle Fork Cronin Creek | Stream | | Tillamook | 45 45 35 N | 123 36 26 W |
| Middle Fork Crooked Creek | Stream | | Lake | 42 19 14 N | 120 10 55 W |
| Middle Fork Crow Creek | Stream | | Wallowa | 45 30 29 N | 117 06 60 W |
| Middle Fork Crystal Creek | Stream | | Curry | 42 50 59 N | 124 26 39 W |
| Middle Fork Dahl Creek | Stream | | Lane | 43 36 33 N | 122 51 26 W |
| Middle Fork Deadman Creek | Stream | | Douglas | 43 01 20 N | 122 55 36 W |
| Middle Fork Deep Creek | Stream | | Lake | 42 02 58 N | 120 10 57 W |
| Middle Fork Dry Creek | Stream | | Baker | 44 41 34 N | 118 16 33 W |
| Middle Fork Fivemile Creek | Stream | | Wasco | 45 27 57 N | 121 21 42 W |
| Middle Fork Foots Creek | Stream | | Jackson | 42 21 50 N | 123 07 01 W |
| Middle Fork Hood River | Stream | | Hood River | 45 34 32 N | 121 37 37 W |
| Middle Fork Imhaha River | Stream | | Wallowa | 45 07 59 N | 117 09 09 W |
| Middle Fork Jackson Creek | Stream | | Malheur | 42 13 10 N | 117 42 30 W |
| Middle Fork John Day River | Stream | | Grant | 44 54 59 N | 119 18 08 W |
| Middle Fork John Day River Rest Area | Locale | 890 | Grant | 44 50 14 N | 119 01 49 W |
| Middle Fork Junetta Creek | Stream | | Lane | 43 45 31 N | 122 42 36 W |
| Middle Fork Lake Creek | Stream | | Jefferson | 44 26 29 N | 121 39 40 W |
| Middle Fork Mosby Creek | Stream | | Douglas | 43 32 51 N | 122 50 43 W |
| Middle Fork Mount Emily Creek | Stream | | Umatilla | 45 28 24 N | 118 08 49 W |
| Middle Fork Muddy Creek | Stream | | Yamhill | 45 09 29 N | 123 19 04 W |
| Middle Fork National Creek | Stream | | Klamath | 43 02 08 N | 122 16 55 W |
| Middle Fork North Fork Klaskanine River | Stream | | Clatsop | 46 03 19 N | 123 39 16 W |
| Middle Fork North Fork Smith River | Stream | | Douglas | 43 52 33 N | 123 49 44 W |
| Middle Fork North Fork Trask River | Stream | | Washington | 45 25 34 N | 123 22 34 W |
| Middle Fork of South Fork Deer Creek | Stream | | Douglas | 43 10 24 N | 123 12 54 W |
| Middle Fork Owyhee River | Stream | | Malheur | 42 32 36 N | 117 09 48 W |
| Middle Fork Parsnip Creek | Stream | | Jackson | 42 38 06 N | 122 23 04 W |
| Middle Fork Pass Creek | Stream | | Grant | 44 45 55 N | 119 02 29 W |
| Middle Fork Pine Creek | Stream | | Baker | 45 02 19 N | 117 12 57 W |
| Middle Fork Ranger Station | Building | 313 | Lane | 43 45 34 N | 122 31 48 W |
| Middle Fork Rattlesnake Creek | Stream | | Harney | 43 45 15 N | 118 48 09 W |
| Middle Fork Recreation Site | Locale | 1172 | Grant | 44 37 48 N | 118 36 19 W |
| Middle Fork Reservoir | Reservoir | 1546 | Harney | 43 51 13 N | 119 17 27 W |
| Middle Fork Riley Creek | Stream | | Curry | 42 24 24 N | 124 24 34 W |
| Middle Fork Rim Reservoir | Reservoir | 1463 | Malheur | 42 31 44 N | 117 07 27 W |
| Middle Fork Rock Creek | Stream | | Benton | 44 30 49 N | 123 27 39 W |
| Middle Fork Rock Creek | Stream | | Gilliam | 45 11 39 N | 119 48 50 W |
| Middle Fork Rogue River | Stream | | Jackson | 42 43 11 N | 122 28 22 W |
| Middle Fork Sardine Creek | Stream | | Jackson | 42 30 13 N | 123 03 55 W |
| Middle Fork Sixes River | Stream | | Curry | 42 48 24 N | 124 13 18 W |
| Middle Fork Stell Creek | Stream | | Lane | 43 37 28 N | 122 55 09 W |
| Middle Fork Street Creek | Stream | | Jefferson | 44 35 07 N | 121 31 10 W |
| Middle Fork Sunshine Creek | Stream | | Grant | 44 39 26 N | 118 42 52 W |
| Middle Fork Swayze Creek | Stream | | Baker | 44 33 36 N | 117 23 25 W |
| Middle Fork Trout Creek | Stream | | Harney | 43 52 54 N | 118 53 24 W |
| Middle Fork Trout Creek | Stream | | Klamath | 42 27 36 N | 121 37 52 W |
| Middle Fork Tumalo Creek | Stream | | Deschutes | 44 02 48 N | 121 35 56 W |
| Middle Fork Whisky Creek | Stream | | Wallowa | 45 36 29 N | 117 23 49 W |
| Middle Fork Wilkins Creek | Stream | | Umatilla | 45 07 13 N | 119 01 07 W |
| Middle Fork Willamette River | Stream | | Lane | 44 01 23 N | 123 01 25 W |
| Middle Fork Wolf Creek | Stream | | Harney | 44 01 48 N | 118 42 04 W |
| Middle Grove | Populated Place | 61 | Marion | 44 58 11 N | 122 57 55 W |
| Middle Grove School | School | 58 | Marion | 44 58 14 N | 122 57 34 W |
| Middle Hanks Lake | Lake | 1645 | Deschutes | 43 48 29 N | 121 56 04 W |
| Middle Herlihy Reservoir | Reservoir | 1544 | Harney | 42 58 50 N | 119 05 58 W |
| Middle Horse Lake | Lake | 1414 | Lane | 44 00 12 N | 121 53 10 W |
| Middle Kirby Rapids | Rapids | 365 | Wallowa | 45 35 03 N | 116 28 60 W |
| Middle Lake | Lake | 396 | Clatsop | 46 05 38 N | 123 37 00 W |
| Middle Lake | Lake | 1861 | Klamath | 42 39 25 N | 122 13 17 W |
| Middle Lake | Lake | 1504 | Marion | 44 49 22 N | 121 48 54 W |
| Middle Lake Dam | Dam | 394 | Clatsop | 46 05 41 N | 123 37 04 W |
| Middle Lake Waterhole | Lake | 1528 | Harney | 42 45 56 N | 119 30 06 W |
| Middle Long Hollow | Valley | | Baker | 44 43 18 N | 117 07 04 W |
| Middle Mountain | Ridge | 757 | Hood River | 45 35 37 N | 121 35 23 W |
| Middle Mountain | Summit | 1361 | Douglas | 43 30 07 N | 122 56 34 W |
| Middle Mountain | Summit | 1079 | Grant | 44 35 01 N | 119 37 13 W |
| Middle Mountain Creek | Stream | | Douglas | 43 29 14 N | 122 54 59 W |
| Middle Mud Creek | Stream | | Umatilla | 45 59 31 N | 118 27 21 W |
| Middle North Falls | Falls | 348 | Marion | 44 53 19 N | 122 38 34 W |
| Middle Pittsburg Rapids | Rapids | 347 | Wallowa | 45 37 47 N | 116 28 22 W |
| Middle Point | Cape | 20 | Douglas | 43 46 47 N | 124 07 14 W |
| Middle Point | Ridge | 1161 | Wallowa | 45 48 45 N | 117 29 39 W |
| Middle Point Divide | Ridge | 1420 | Wallowa | 45 31 32 N | 116 50 18 W |
| Middle Reservoir | Reservoir | 1737 | Harney | 42 18 14 N | 118 49 21 W |
| Middle Reservoir | Reservoir | 1649 | Harney | 42 52 06 N | 118 44 21 W |
| Middle Ridge | Ridge | 473 | Douglas | 43 37 05 N | 123 26 00 W |
| Middle Ridge | Ridge | 859 | Douglas | 42 51 14 N | 122 49 59 W |
| Middle Ridge | Ridge | 423 | Lincoln | 44 25 03 N | 123 48 01 W |
| Middle Ridge | Ridge | 372 | Polk | 44 46 05 N | 123 30 45 W |
| Middle Ridge | Ridge | 1342 | Union | 45 35 59 N | 118 01 45 W |
| Middle Rim Reservoir | Reservoir | 1261 | Malheur | 43 37 45 N | 117 46 34 W |
| Middle Rock Lake | Lake | 1311 | Clackamas | 45 08 39 N | 121 59 04 W |
| Middle Rosary Lake | Lake | 1777 | Klamath | 43 36 24 N | 122 00 01 W |
| Middle Rugg Spring | Spring | 753 | Umatilla | 45 25 54 N | 118 56 37 W |
| Middle Santiam River | Stream | | Linn | 44 24 58 N | 122 38 02 W |
| Middle Santiam Wilderness | Reserve | 711 | Linn | 44 31 29 N | 122 13 04 W |
| Middle Sister | Summit | 3051 | Lane | 44 08 53 N | 121 47 02 W |
| Middle Sister Creek | Stream | | Baker | 44 32 56 N | 118 17 32 W |