Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Oakland School | School | 296 | Holt | 40 00 01 N | 095 10 20 W |
| Oakland School | School | 282 | Jackson | 38 59 02 N | 094 23 20 W |
| Oakland School | School | 315 | Jasper | 37 06 45 N | 094 28 29 W |
| Oakland School | School | 342 | Laclede | 37 38 04 N | 092 27 57 W |
| Oakland School | School | 220 | Lewis | 40 03 53 N | 091 51 08 W |
| Oakland School | School | 307 | Mercer | 40 26 08 N | 093 44 16 W |
| Oakland School (historical) | School | 223 | Boone | 38 49 10 N | 092 18 34 W |
| Oakland School (historical) | School | 291 | Buchanan | 39 44 50 N | 094 40 60 W |
| Oakland School (historical) | School | 290 | Caldwell | 39 40 42 N | 094 08 57 W |
| Oakland School (historical) | School | 415 | Greene | 37 13 22 N | 093 11 24 W |
| Oakland School (historical) | School | 281 | Grundy | 40 02 56 N | 093 44 45 W |
| Oakland School (historical) | School | 289 | Jackson | 39 04 48 N | 094 13 06 W |
| Oakland School (historical) | School | 244 | Johnson | 38 42 47 N | 093 44 52 W |
| Oakland School (historical) | School | 250 | Lafayette | 38 58 16 N | 093 50 31 W |
| Oakland School (historical) | School | 408 | Lawrence | 37 03 28 N | 093 44 04 W |
| Oakland School (historical) | School | 252 | Moniteau | 38 48 00 N | 092 28 27 W |
| Oakland School (historical) | School | 258 | Morgan | 38 33 37 N | 093 02 32 W |
| Oakland School (historical) | School | 241 | Randolph | 39 32 08 N | 092 31 21 W |
| Oakland School (historical) | School | 189 | St. Charles | 38 50 51 N | 090 56 11 W |
| Oakland School (historical) | School | 166 | Ste. Genevieve | 37 47 21 N | 090 08 08 W |
| Oaklawn Cemetery | Cemetery | 305 | Howell | 36 43 25 N | 091 50 32 W |
| Oaklawn Cemetery | Cemetery | 338 | Pulaski | 37 51 07 N | 092 24 09 W |
| Oaklawn Cemetery | Cemetery | 261 | St. Francois | 37 50 24 N | 090 29 22 W |
| Oakleigh Mountain | Summit | 477 | Barry | 36 33 05 N | 094 00 42 W |
| Oakley | Populated Place | 230 | Reynolds | 37 08 56 N | 090 57 19 W |
| Oakley Church | Church | 202 | Callaway | 38 37 51 N | 091 57 50 W |
| Oakley Hollow | Valley | | Reynolds | 37 08 55 N | 090 57 39 W |
| Oakmont | Populated Place | 350 | Taney | 36 31 57 N | 093 16 43 W |
| Oakridge Church | Church | 235 | Scotland | 40 25 23 N | 092 07 42 W |
| Oakridge Church | Church | 165 | St. Charles | 38 46 30 N | 090 39 50 W |
| Oakridge Estates Lake | Reservoir | 158 | St. Charles | 38 47 00 N | 090 40 00 W |
| Oakridge Estates Lake Dam | Dam | 158 | St. Charles | 38 47 00 N | 090 40 00 W |
| Oaks | Populated Place | 299 | Clay | 39 11 47 N | 094 34 11 W |
| Oakside | Populated Place | 371 | Shannon | 37 06 26 N | 091 39 09 W |
| Oakside School | School | 361 | Shannon | 37 06 52 N | 091 38 14 W |
| Oakton | Populated Place | 297 | Barton | 37 27 29 N | 094 21 15 W |
| Oakton School | School | 293 | Barton | 37 27 17 N | 094 21 17 W |
| Oakvale | Populated Place | 188 | Jefferson | 38 05 30 N | 090 27 36 W |
| Oakview | Populated Place | 305 | Clay | 39 12 31 N | 094 34 06 W |
| Oakview School | School | 186 | Marion | 39 53 02 N | 091 35 07 W |
| Oakville | Populated Place | 78 | Pemiscot | 36 09 13 N | 089 53 47 W |
| Oakville | Populated Place | 183 | St. Louis | 38 28 12 N | 090 18 16 W |
| Oakville Church | Church | 290 | Polk | 37 28 31 N | 093 28 14 W |
| Oakville Fire Station Number 2 | Building | 180 | St. Louis | 38 28 08 N | 090 18 17 W |
| Oakville Fire Station Number 6 | Building | 182 | St. Louis | 38 26 17 N | 090 19 28 W |
| Oakville Fire Station Number 7 | Building | 170 | St. Louis | 38 29 08 N | 090 21 17 W |
| Oakville High School | School | 161 | St. Louis | 38 28 20 N | 090 19 20 W |
| Oakville Junior High School | School | 184 | St. Louis | 38 27 35 N | 090 18 12 W |
| Oakville School | School | 170 | St. Louis | 38 28 42 N | 090 19 12 W |
| Oakwood | Populated Place | 304 | Clay | 39 12 07 N | 094 34 13 W |
| Oakwood | Populated Place | 159 | Marion | 39 41 07 N | 091 23 49 W |
| Oakwood Cemetery | Cemetery | 261 | Macon | 39 44 43 N | 092 28 36 W |
| Oakwood Church | Church | 361 | Newton | 36 47 28 N | 094 25 54 W |
| Oakwood Golf Club | Locale | 296 | Jackson | 38 56 53 N | 094 33 10 W |
| Oakwood Lake Dam | Dam | 252 | Jackson | 38 56 36 N | 094 33 25 W |
| Oakwood Manor | Populated Place | 302 | Clay | 39 11 49 N | 094 33 52 W |
| Oakwood Park | Populated Place | 303 | Clay | 39 12 12 N | 094 34 26 W |
| Oakwood School | School | 254 | Macon | 39 45 31 N | 092 26 05 W |
| Oakwood School (historical) | School | 398 | Christian | 36 52 05 N | 093 06 12 W |
| Oakwood School Number One (historical) | School | 216 | Cooper | 38 59 46 N | 092 54 48 W |
| Oakwood School Number Two | School | 214 | Cooper | 39 01 50 N | 092 56 55 W |
| Oasis | Populated Place | 162 | Lincoln | 39 04 58 N | 090 44 49 W |
| Oasis (historical) | Populated Place | 279 | Taney | 36 32 19 N | 093 17 59 W |
| Oasis Bluff | Cliff | 279 | Taney | 36 32 22 N | 093 18 04 W |
| Oasis Lake | Lake | 131 | Lincoln | 39 04 44 N | 090 44 21 W |
| Oates | Populated Place | 301 | Reynolds | 37 33 46 N | 091 03 23 W |
| Oates Lookout Tower | Tower | 416 | Reynolds | 37 31 14 N | 091 02 30 W |
| Oates School (historical) | School | 302 | Reynolds | 37 33 39 N | 091 03 22 W |
| Oberg School | School | 321 | DeKalb | 39 46 08 N | 094 24 46 W |
| Oberlag Lake Dam | Dam | 274 | Audrain | 39 06 24 N | 092 06 07 W |
| Observation Park | Park | 291 | Jackson | 39 05 18 N | 094 35 52 W |
| Ocean Wave School | School | 195 | Ralls | 39 39 23 N | 091 24 46 W |
| Ocie | Populated Place | 227 | Ozark | 36 33 31 N | 092 45 33 W |
| Octa | Populated Place | 79 | Dunklin | 36 10 16 N | 090 07 23 W |
| Octa Church (historical) | Church | 78 | Dunklin | 36 10 57 N | 090 09 02 W |
| Odd Fellows Cemetery | Cemetery | 145 | St. Louis | 38 31 19 N | 090 16 33 W |
| Odd Fellows Home Lake Dam | Dam | 240 | Clay | 39 13 24 N | 094 24 31 W |
| Odell Cemetery | Cemetery | 221 | Reynolds | 37 06 31 N | 090 55 57 W |
| Odell Cemetery | Cemetery | 225 | Saline | 39 08 07 N | 093 11 03 W |
| Odell Church | Church | 299 | Ray | 39 17 58 N | 094 08 07 W |
| Odell Hollow | Valley | | Shannon | 37 07 50 N | 091 16 37 W |
| Odell Lake Section 1 Dam | Dam | 247 | Lafayette | 39 04 18 N | 093 50 49 W |
| Odessa | Populated Place | 284 | Lafayette | 38 59 57 N | 093 57 13 W |
| Odessa Cemetery | Cemetery | 263 | Lafayette | 39 00 02 N | 093 55 29 W |
| Odessa Dam | Dam | 246 | Lafayette | 38 58 18 N | 093 59 25 W |
| Odessa Hills Lake | Reservoir | 236 | Lafayette | 39 02 48 N | 093 59 25 W |
| Odessa Hills Lake Dam | Dam | 236 | Lafayette | 39 02 48 N | 093 59 25 W |
| Odessa Lake | Reservoir | 248 | Lafayette | 38 58 12 N | 093 58 43 W |
| Odessa Lake | Reservoir | 246 | Lafayette | 38 58 18 N | 093 59 25 W |
| Odessa Old Reservoir Dam | Dam | 248 | Lafayette | 38 58 12 N | 093 58 43 W |
| Odessa Reservoir | Reservoir | 249 | Lafayette | 38 58 09 N | 093 58 31 W |
| Odie Branch | Stream | | Platte | 39 18 25 N | 092 50 31 W |
| Odin | Populated Place | 381 | Wright | 37 16 06 N | 092 37 07 W |
| Odom Church | Church | 268 | Ozark | 36 40 59 N | 092 14 19 W |
| Ody Park | Locale | 240 | Pulaski | 37 53 00 N | 092 16 37 W |
| Oerke Enterprises Airport | Airport | 233 | Bates | 38 13 12 N | 094 29 46 W |
| Oermann | Populated Place | 241 | Jefferson | 38 18 29 N | 090 43 24 W |
| Oetterer Cemetery | Cemetery | 202 | Gasconade | 38 38 19 N | 091 31 54 W |
| Oetters | Populated Place | 145 | Franklin | 38 33 19 N | 090 47 37 W |
| Oetting Cemetery | Cemetery | 434 | Wright | 37 10 26 N | 092 33 08 W |
| Oetting Church | Church | 435 | Wright | 37 10 17 N | 092 33 08 W |
| Oetting Lake Dam | Dam | 181 | Warren | 38 44 24 N | 091 18 31 W |
| Oetting School | Locale | 440 | Wright | 37 10 02 N | 092 33 17 W |
| Off Davis Hollow | Valley | | Barry | 36 34 22 N | 093 48 11 W |
| Offset Mine | Mine | 249 | Madison | 37 36 54 N | 090 17 01 W |
| Offutt Dam | Dam | 274 | Callaway | 39 03 36 N | 092 00 13 W |
| Offutt Lake | Reservoir | 274 | Callaway | 39 03 36 N | 092 00 13 W |
| Ogborn | Populated Place | 291 | St. Francois | 37 49 52 N | 090 25 18 W |
| Ogden | Locale | 78 | Pemiscot | 36 15 45 N | 089 55 32 W |
| Ogden | Populated Place | 94 | New Madrid | 36 44 40 N | 089 33 23 W |