Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Oats Run | Stream | | Pocahontas | 38 27 17 N | 079 57 26 W |
| Obes Branch | Stream | | Boone | 37 58 13 N | 081 49 46 W |
| Oceana | Populated Place | 381 | Wyoming | 37 41 31 N | 081 37 26 W |
| Oceana High School (historical) | School | 386 | Wyoming | 37 41 12 N | 081 37 31 W |
| Oceana Middle School | School | | Wyoming | 37 41 13 N | 081 37 29 W |
| Ochre Run | Stream | | Mineral | 39 27 25 N | 078 52 23 W |
| Odaville | Populated Place | 199 | Jackson | 38 55 57 N | 081 38 26 W |
| Odd | Populated Place | 810 | Raleigh | 37 35 36 N | 081 11 38 W |
| Odd Fellows Cemetery | Cemetery | 212 | Mason | 39 00 58 N | 082 01 45 W |
| Odd Post Office | Post Office | 816 | Raleigh | 37 35 43 N | 081 11 38 W |
| Odell | Populated Place | 354 | Kanawha | 38 23 25 N | 081 21 55 W |
| Odell Cemetery | Cemetery | 466 | Harrison | 39 26 23 N | 080 20 03 W |
| Odell Cemetery | Cemetery | 366 | Kanawha | 38 23 26 N | 081 21 51 W |
| Odell Fork | Stream | | Wayne | 38 14 16 N | 082 32 21 W |
| Odell Knob | Summit | 464 | Harrison | 39 26 22 N | 080 20 02 W |
| Odell Knob Church | Church | 444 | Marion | 39 26 31 N | 080 20 00 W |
| Odell School (historical) | School | 392 | Kanawha | 38 23 59 N | 081 21 55 W |
| Odell School (historical) | School | 773 | Nicholas | 38 12 03 N | 080 43 52 W |
| Odell Spring Branch | Stream | | Nicholas | 38 13 35 N | 080 44 49 W |
| Odell Town | Populated Place | 803 | Nicholas | 38 11 52 N | 080 42 48 W |
| Odessa | Populated Place | 289 | Clay | 38 25 43 N | 081 14 16 W |
| Odey Run | Stream | | Pocahontas | 38 28 53 N | 079 55 31 W |
| Offard Hollow | Valley | | Lincoln | 38 00 08 N | 082 06 24 W |
| Offie Run | Stream | | Wirt | 38 59 05 N | 081 30 02 W |
| Ogden | Populated Place | 501 | Fayette | 37 58 37 N | 081 07 44 W |
| Ogden | Populated Place | 211 | Wood | 39 18 06 N | 081 24 07 W |
| Ogden Cemetery | Cemetery | 226 | Wood | 39 18 02 N | 081 31 31 W |
| Oglebay Drive Spring | Spring | 288 | Ohio | 40 05 31 N | 080 39 35 W |
| Oglebay Hall | Building | 292 | Monongalia | 39 38 10 N | 079 57 13 W |
| Oglebay Mansion Museum | Building | 342 | Ohio | 40 06 17 N | 080 39 30 W |
| Oglebay Park | Park | 350 | Ohio | 40 06 07 N | 080 39 35 W |
| Oglebay Park Lake Dam | Dam | 373 | Ohio | 40 06 12 N | 080 39 47 W |
| Oglebay Park Spring | Spring | 334 | Ohio | 40 06 00 N | 080 39 27 W |
| Ohev Sholom Temple | Church | 170 | Cabell | 38 24 44 N | 082 26 26 W |
| Ohio County | Civil | 395 | Ohio | 40 06 00 N | 080 36 59 W |
| Ohio County Courthouse | Building | 204 | Ohio | 40 03 53 N | 080 43 13 W |
| Ohio County Jail | Building | 207 | Ohio | 40 03 53 N | 080 43 11 W |
| Ohio County Public Library | Building | 204 | Ohio | 40 03 40 N | 080 43 22 W |
| Ohio River Islands National Wildlife Refuge | Park | 184 | Pleasants | 39 25 56 N | 081 10 50 W |
| Ohio River Islands National Wildlife Refuge | Park | 187 | Pleasants | 39 24 37 N | 081 11 51 W |
| Ohio Street Church of God | Church | 182 | Kanawha | 38 21 09 N | 081 43 55 W |
| Ohio Valley College | School | 202 | Wood | 39 18 10 N | 081 32 02 W |
| Ohio Valley Medical Center | Hospital | 221 | Ohio | 40 03 35 N | 080 43 14 W |
| Ohio Valley Medical Center Heliport | Airport | 228 | Ohio | 40 03 34 N | 080 43 12 W |
| Ohio Valley Speedway | Locale | 195 | Wood | 39 11 52 N | 081 39 04 W |
| Ohley | Populated Place | 239 | Kanawha | 38 06 25 N | 081 26 56 W |
| Oil Creek | Stream | | Braxton | 38 51 46 N | 080 39 19 W |
| Oil Ridge | Ridge | 354 | Ritchie | 39 09 33 N | 081 07 42 W |
| Oil Ridge | Ridge | 337 | Tyler | 39 34 29 N | 080 56 58 W |
| Oil Ridge Church | Church | 337 | Ritchie | 39 09 35 N | 081 08 42 W |
| Oil Ridge School (historical) | School | 340 | Ritchie | 39 09 32 N | 081 08 39 W |
| Oil Rock Run | Stream | | Wirt | 39 03 09 N | 081 20 04 W |
| Oil Rock School (historical) | School | 199 | Wirt | 39 03 11 N | 081 19 56 W |
| Oil Spring | Populated Place | 328 | Ritchie | 39 13 20 N | 081 17 18 W |
| Oil Spring Run | Stream | | Ritchie | 39 11 24 N | 081 16 13 W |
| Oil Well Branch | Stream | | Kanawha | 38 19 48 N | 081 20 57 W |
| Oil Well Hollow | Valley | | Logan | 37 45 25 N | 081 47 12 W |
| Oilville | Populated Place | 325 | Logan | 37 43 40 N | 082 02 13 W |
| Oka | Populated Place | 261 | Calhoun | 38 39 22 N | 081 08 11 W |
| Okey Roush Spring | Spring | 218 | Mason | 38 53 40 N | 081 58 25 W |
| Oklahoma School (historical) | School | 309 | Putnam | 38 35 59 N | 081 47 32 W |
| Okonoko | Populated Place | 178 | Hampshire | 39 31 23 N | 078 31 31 W |
| Okonoko Church | Church | 326 | Hampshire | 39 30 04 N | 078 33 46 W |
| Olcott | Populated Place | 217 | Kanawha | 38 14 04 N | 081 43 27 W |
| Old Ada Dam | Dam | 716 | Mercer | 37 16 57 N | 081 09 03 W |
| Old Antioch Cemetery | Cemetery | 297 | Putnam | 38 34 16 N | 081 48 03 W |
| Old Arthur | Locale | 350 | Grant | 39 05 51 N | 079 06 10 W |
| Old Beech Run Cemetery | Cemetery | 205 | Pleasants | 39 26 02 N | 081 02 30 W |
| Old Belcher Mountain Community Cemetery | Cemetery | 636 | McDowell | 37 25 42 N | 081 31 24 W |
| Old Bethany Church | Church | 256 | Brooke | 40 12 17 N | 080 33 29 W |
| Old Boreman School (historical) | School | 205 | Wood | 39 17 21 N | 081 28 00 W |
| Old Bramwell Water Supply Dam | Dam | 759 | Mercer | 37 19 00 N | 081 18 11 W |
| Old Brick Church (historical) | Church | 547 | Preston | 39 39 13 N | 079 34 37 W |
| Old Brick Church Cemetery | Cemetery | 647 | Randolph | 38 41 15 N | 079 58 58 W |
| Old Cacapon Power Dam | Dam | 145 | Morgan | 39 36 18 N | 078 16 59 W |
| Old Carnifex Ferry Site | Locale | 353 | Nicholas | 38 11 37 N | 080 56 35 W |
| Old Cemetery | Cemetery | 757 | Webster | 38 38 47 N | 080 20 13 W |
| Old City Cemetery | Cemetery | 265 | Logan | 37 50 51 N | 081 59 12 W |
| Old Country Church | Church | 794 | Raleigh | 37 38 58 N | 081 14 08 W |
| Old Droop Church | Church | 709 | Pocahontas | 38 03 49 N | 080 14 49 W |
| Old Dutch Church | Church | 534 | Barbour | 39 12 24 N | 079 53 21 W |
| Old Enon Cemetery | Cemetery | 182 | Morgan | 39 29 51 N | 078 22 56 W |
| Old Falling Waters Cemetery | Cemetery | 129 | Berkeley | 39 33 42 N | 077 53 25 W |
| Old Falling Waters Presbyterian Church | Church | 130 | Berkeley | 39 33 29 N | 077 53 31 W |
| Old Field Branch | Stream | | Greenbrier | 38 02 47 N | 080 33 27 W |
| Old Field Fork | Stream | | Gilmer | 38 57 35 N | 080 40 09 W |
| Old Field Fork | Stream | | Pocahontas | 38 25 08 N | 080 07 48 W |
| Old Field Fork Cemetery | Cemetery | 288 | Lewis | 38 58 58 N | 080 40 15 W |
| Old Field Mountain | Ridge | 1237 | Greenbrier | 38 03 08 N | 080 30 21 W |
| Old Field School (historical) | School | 256 | Lewis | 38 58 52 N | 080 40 11 W |
| Old Field School (historical) | School | 428 | Marshall | 39 55 10 N | 080 39 17 W |
| Old Fields | Populated Place | 250 | Hardy | 39 08 05 N | 078 56 59 W |
| Old Fields Church | Church | 246 | Hardy | 39 08 01 N | 078 57 15 W |
| Old Fields Magisterial District | Civil | 303 | Hardy | 39 08 32 N | 078 55 59 W |
| Old Fields Post Office | Post Office | 253 | Hardy | 39 08 07 N | 078 57 03 W |
| Old Fields School (historical) | School | 251 | Hardy | 39 08 10 N | 078 56 55 W |
| Old Fork | Stream | | Wayne | 37 54 30 N | 082 22 36 W |
| Old Fort | Locale | 652 | Randolph | 38 37 58 N | 080 01 20 W |
| Old Furnace Church | Church | 250 | Mineral | 39 34 24 N | 078 47 17 W |
| Old Gauley | Populated Place | 242 | Fayette | 38 09 22 N | 081 11 30 W |
| Old German Lutheran Reformed Cemetery | Cemetery | 138 | Berkeley | 39 27 23 N | 077 58 06 W |
| Old Greenbrier Baptist Church | Church | 475 | Greenbrier | 37 43 43 N | 080 38 31 W |
| Old Harmony Cemetery | Cemetery | 347 | Wetzel | 39 38 49 N | 080 24 47 W |
| Old Hill Cemetery | Cemetery | 338 | Lewis | 39 02 06 N | 080 28 11 W |
| Old House Branch | Stream | | Boone | 37 53 02 N | 081 39 49 W |
| Old House Branch | Stream | | Lincoln | 38 08 49 N | 081 59 37 W |
| Old House Branch | Stream | | Lincoln | 38 08 48 N | 081 53 27 W |
| Old House Branch | Stream | | Mingo | 37 35 03 N | 081 54 20 W |
| Old House Branch | Stream | | Mingo | 37 56 20 N | 082 11 33 W |
| Old House Branch | Stream | | Mingo | 37 56 55 N | 082 14 09 W |