Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Our Lady of Victory School | School | 91 | Fresno | 36 46 34 N | 119 49 49 W |
| Our Lady of Victory School | School | 21 | Los Angeles | 33 53 53 N | 118 12 58 W |
| Our Lady Queen of Angels High School | School | 96 | Los Angeles | 34 03 43 N | 118 14 25 W |
| Our Lady Queen of Martyrs Roman Catholic Church | Church | 101 | Los Angeles | 34 03 06 N | 118 13 19 W |
| Our Ladys Home | Building | 19 | Alameda | 37 46 57 N | 122 13 12 W |
| Our Mother of Confidence Church | Church | 105 | San Diego | 32 51 02 N | 117 13 04 W |
| Our Mother of Good Counsel Church | Church | 155 | Los Angeles | 34 06 34 N | 118 17 29 W |
| Our Redeemer Lutheran Church | Church | 40 | Merced | 37 23 01 N | 120 43 19 W |
| Our Redeemer Lutheran Church | Church | | Orange | 33 47 02 N | 117 58 33 W |
| Our Redeemer Lutheran Church | Church | 65 | San Diego | 32 43 10 N | 117 05 10 W |
| Our Redeemers Lutheran Church | Church | 16 | San Mateo | 37 39 11 N | 122 26 00 W |
| Our Savior Elementary School (historical) | School | 10 | Sacramento | 38 31 35 N | 121 27 18 W |
| Our Savior Lutheran Church | Church | 605 | Butte | 39 46 10 N | 121 34 39 W |
| Our Savior Lutheran Church | Church | 50 | Contra Costa | 37 59 20 N | 122 17 16 W |
| Our Savior Lutheran Church | Church | 64 | Los Angeles | 34 03 47 N | 118 19 03 W |
| Our Savior Lutheran Church | Church | 1381 | Plumas | 40 18 24 N | 121 13 50 W |
| Our Savior Lutheran Church | Church | 10 | Sacramento | 38 31 35 N | 121 27 19 W |
| Our Savior Lutheran School | School | 152 | Alameda | 37 40 11 N | 121 46 30 W |
| Our Savior Pre-School | School | 50 | Contra Costa | 37 59 20 N | 122 17 16 W |
| Our Savior's First Lutheran Church | Church | | Los Angeles | 34 16 21 N | 118 29 38 W |
| Our Saviors Chapel | Church | 58 | Los Angeles | 34 01 30 N | 118 16 59 W |
| Our Saviors Evangelical Church | Church | 112 | San Diego | 32 45 02 N | 117 07 43 W |
| Our Saviors Evangelical Lutheran Church | Church | 9 | Ventura | 34 10 23 N | 119 11 12 W |
| Our Saviors Lutheran Church | Church | 15 | Humboldt | 40 34 41 N | 124 15 52 W |
| Our Saviors Lutheran Church | Church | 702 | Kern | 35 38 06 N | 117 40 20 W |
| Our Saviors Lutheran Church | Church | 16 | Los Angeles | 33 46 15 N | 118 09 51 W |
| Our Saviors Lutheran Church | Church | 78 | Orange | 33 24 54 N | 117 35 52 W |
| Our Saviors Lutheran Church | Church | 739 | Riverside | 33 55 36 N | 116 53 28 W |
| Our Saviors School | School | 295 | Los Angeles | 34 16 20 N | 118 29 38 W |
| Our Saviour Lutheran Church | Church | 1263 | Inyo | 37 21 39 N | 118 23 32 W |
| Our Saviour's Lutheran Church | Church | | Orange | 33 48 04 N | 117 50 42 W |
| Our Saviours Lutheran Church | Church | 91 | Fresno | 36 46 12 N | 119 49 05 W |
| Our Saviours Lutheran Church | Church | 32 | Stanislaus | 37 28 12 N | 121 08 03 W |
| Oursan Ridge | Ridge | 311 | Contra Costa | 37 57 16 N | 122 13 03 W |
| Ousley Canyon | Valley | | Santa Clara | 37 00 27 N | 121 36 46 W |
| Ousley Ditch | Canal | 221 | Yuba | 39 12 28 N | 121 19 05 W |
| Ousley Park | Park | 89 | Santa Clara | 37 00 58 N | 121 37 29 W |
| Out Door Gospel Church | Church | 18 | Ventura | 34 17 37 N | 119 17 50 W |
| Outcrop Spring | Spring | 1774 | Lassen | 41 06 53 N | 120 30 22 W |
| Outdoor Resorts of America Golf Course | Locale | 108 | Riverside | 33 48 45 N | 116 26 58 W |
| Outer Break | Area | -2 | Humboldt | 40 24 37 N | 124 24 40 W |
| Outer Harbor | Bay | 12 | Los Angeles | 33 44 10 N | 118 11 37 W |
| Outer Harbor Entrance Channel | Bay | -3 | Alameda | 37 48 34 N | 122 20 18 W |
| Outer Harbor Terminal | Locale | 2 | Alameda | 37 49 05 N | 122 18 39 W |
| Outer Reach | Channel | 2 | Humboldt | 40 48 03 N | 124 11 06 W |
| Outer Santa Barbara Passage | Channel | -3 | Los Angeles | 33 12 00 N | 118 32 03 W |
| Outfall Drain | Canal | 69 | Imperial | 33 21 03 N | 114 42 50 W |
| Outingdale | Populated Place | 496 | El Dorado | 38 37 00 N | 120 43 48 W |
| Outlaw Camp | Locale | 525 | Monterey | 36 14 30 N | 121 43 52 W |
| Outlaw Mine | Mine | 601 | Riverside | 34 01 21 N | 115 33 51 W |
| Outlet | Locale | 472 | Mendocino | 39 28 07 N | 123 21 48 W |
| Outlet Canal | Canal | 91 | Kern | 35 16 55 N | 119 19 25 W |
| Outlet Creek | Stream | | Mendocino | 39 37 37 N | 123 20 43 W |
| Outreach for Christ Church | Church | 13 | San Diego | 32 42 12 N | 117 08 51 W |
| Outside Canal | Canal | 46 | Merced | 36 57 12 N | 120 48 32 W |
| Outside Creek | Stream | | Tulare | 36 11 31 N | 119 15 21 W |
| Outside Creek Elementary School | Locale | 23 | Merced | 37 17 34 N | 120 58 51 W |
| Outside Creek School (historical) | School | 106 | Tulare | 36 16 09 N | 119 12 25 W |
| Ouzel Creek | Stream | | Tulare | 36 43 30 N | 118 26 40 W |
| Ovejo (historical) | Populated Place | 59 | Madera | 37 03 16 N | 120 18 60 W |
| Oven Lid | Summit | 2021 | Tehama | 40 01 49 N | 122 47 53 W |
| Overfelt High School | School | 37 | Santa Clara | 37 19 52 N | 121 49 46 W |
| Overflow Campground | Locale | 2244 | Alpine | 38 28 38 N | 120 01 26 W |
| Overholster Meadow | Flat | 2771 | Tulare | 36 22 24 N | 118 12 22 W |
| Overholtz Mine | Mine | 2326 | Inyo | 37 08 29 N | 118 02 43 W |
| Overland Elementary School | School | 51 | Los Angeles | 34 02 18 N | 118 25 15 W |
| Overland Emigrant Trail | Trail | 1832 | Placer | 39 18 58 N | 120 35 02 W |
| Overland Ranch | Locale | 81 | Kings | 36 17 42 N | 119 28 27 W |
| Overlook | Populated Place | 29 | San Diego | 32 46 17 N | 117 11 57 W |
| Overlook Mountain | Summit | 3108 | Tulare | 36 20 02 N | 118 22 19 W |
| Overlook Park | Park | 101 | Solano | 38 03 47 N | 122 09 09 W |
| Overlook Trail | Trail | 8 | Monterey | 36 09 31 N | 121 40 18 W |
| Overton Mine | Mine | 1493 | Siskiyou | 41 21 19 N | 123 00 44 W |
| Overton Ranch | Locale | 1441 | Kern | 35 04 19 N | 118 25 07 W |
| Ovis Bridge | Arch | 1537 | Siskiyou | 41 42 11 N | 121 31 03 W |
| Owen Hall | Building | 4 | San Joaquin | 37 58 48 N | 121 18 46 W |
| Owen House | Building | 2561 | Mono | 38 12 34 N | 119 00 45 W |
| Owens Community Day School | School | 40 | Los Angeles | 33 59 35 N | 118 19 12 W |
| Owens Butte | Summit | 353 | Tehama | 39 53 52 N | 122 34 17 W |
| Owens Camp | Locale | 1083 | Kern | 35 26 36 N | 117 52 13 W |
| Owens Camp (historical) | Locale | 1587 | El Dorado | 38 44 13 N | 120 14 19 W |
| Owens Camp Forest Service Station | Locale | 1596 | El Dorado | 38 44 11 N | 120 14 29 W |
| Owens Creek | Stream | | Merced | 37 13 17 N | 120 42 50 W |
| Owens Creek | Stream | | Trinity | 40 53 48 N | 122 56 16 W |
| Owens Dam | Dam | 115 | Mariposa | 37 18 54 N | 120 11 08 W |
| Owens Lake | Flat | 1086 | Inyo | 36 25 60 N | 117 57 03 W |
| Owens Lake-Silver Lead Furnace Historical Marker | Park | 1110 | Inyo | 36 31 27 N | 117 54 21 W |
| Owens Mine | Mine | 1332 | San Diego | 33 05 05 N | 116 36 10 W |
| Owens Mountain | Summit | 488 | Fresno | 36 55 48 N | 119 38 29 W |
| Owens Peak | Summit | 2571 | Kern | 35 44 18 N | 117 59 49 W |
| Owens Peak Wilderness | Reserve | 1957 | Kern | 35 44 28 N | 117 58 55 W |
| Owens Point | Summit | 3446 | Inyo | 36 30 04 N | 118 09 23 W |
| Owens Ravine | Valley | | Butte | 39 27 52 N | 121 26 31 W |
| Owens Reservoir | Reservoir | 115 | Mariposa | 37 18 54 N | 120 11 08 W |
| Owens River | Stream | | Inyo | 36 32 31 N | 117 58 45 W |
| Owens River Canal | Canal | 1317 | Inyo | 37 20 28 N | 118 25 32 W |
| Owens River Gorge | Valley | | Inyo | 37 24 23 N | 118 30 21 W |
| Owens River Ranch | Locale | 2169 | Mono | 37 45 01 N | 118 55 24 W |
| Owens Valley | Valley | | Inyo | 37 22 25 N | 118 22 38 W |
| Owens Valley Elementary School | School | 1194 | Inyo | 36 48 08 N | 118 11 46 W |
| Owens Valley High School | School | 1193 | Inyo | 36 48 10 N | 118 11 47 W |
| Owens Valley Radio Observatory | Locale | 1207 | Inyo | 37 14 00 N | 118 17 01 W |
| Owens Valley Ranch | Locale | 1403 | Inyo | 37 09 02 N | 118 19 36 W |
| Owenyo | Populated Place | 1126 | Inyo | 36 40 42 N | 118 02 39 W |
| Owl | Populated Place | 613 | Riverside | 33 55 40 N | 116 49 03 W |
| Owl Canyon | Valley | | San Bernardino | 35 00 49 N | 117 01 06 W |
| Owl Canyon | Valley | | Santa Barbara | 34 54 36 N | 120 01 23 W |
| Owl Canyon Campground | Locale | 933 | San Bernardino | 35 01 20 N | 117 01 16 W |
| Owl Creek | Stream | | Butte | 39 34 26 N | 121 14 12 W |
| Owl Creek | Stream | | Humboldt | 40 33 21 N | 123 56 09 W |