Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Oak Swamp Creek | Stream | | Greene | 31 14 27 N | 088 45 59 W |
| Oak Vale | Populated Place | 63 | Lawrence | 31 26 19 N | 089 57 52 W |
| Oak Valley Cemetery | Cemetery | 30 | Yazoo | 32 45 43 N | 090 33 09 W |
| Oak Valley Church | Church | 90 | Lee | 34 09 46 N | 088 46 02 W |
| Oak Valley Landing | Locale | 31 | Yazoo | 32 46 29 N | 090 32 00 W |
| Oak View Church | Church | 172 | Union | 34 30 31 N | 088 53 33 W |
| Oakachickan (historical) | Locale | 66 | Yalobusha | 33 55 02 N | 089 42 30 W |
| Oakbowery Church | Church | 145 | Jasper | 31 55 36 N | 089 04 30 W |
| Oakcliff Villas (subdivision) | Populated Place | 85 | Lee | 34 15 55 N | 088 40 15 W |
| Oakdale Cemetery | Cemetery | 93 | Covington | 31 30 60 N | 089 34 35 W |
| Oakdale Cemetery | Cemetery | 146 | Covington | 31 42 08 N | 089 43 21 W |
| Oakdale Cemetery | Cemetery | 110 | Rankin | 32 20 56 N | 089 58 55 W |
| Oakdale Church | Church | 92 | Covington | 31 30 59 N | 089 34 35 W |
| Oakdale Church | Church | 130 | Lauderdale | 32 30 02 N | 088 49 33 W |
| Oakdale Church | Church | 133 | Pike | 31 13 08 N | 090 25 44 W |
| Oakdale Church | Church | 119 | Rankin | 32 20 55 N | 089 58 27 W |
| Oakdale Park (subdivision) | Populated Place | 65 | Lowndes | 33 36 15 N | 088 25 43 W |
| Oakey Woods Creek | Stream | | Jones | 31 36 30 N | 089 19 33 W |
| Oakhurst Baptist Church | Church | 52 | Coahoma | 34 12 01 N | 090 35 40 W |
| Oakhurst Elementary School | School | 52 | Coahoma | 34 12 05 N | 090 34 40 W |
| Oakhurst Plantation | Locale | 53 | Coahoma | 34 15 53 N | 090 35 47 W |
| Oakhurst Village Shopping Center | Locale | 51 | Coahoma | 34 12 14 N | 090 35 35 W |
| Oakland | Populated Place | 124 | Itawamba | 34 16 58 N | 088 13 57 W |
| Oakland | Populated Place | 139 | Pike | 31 15 42 N | 090 30 02 W |
| Oakland | Populated Place | 107 | Yalobusha | 34 03 20 N | 089 54 59 W |
| Oakland Baptist Church | Church | 152 | Alcorn | 34 54 21 N | 088 29 13 W |
| Oakland Cemetery | Cemetery | 70 | Claiborne | 31 52 45 N | 091 08 35 W |
| Oakland Cemetery | Cemetery | 123 | Itawamba | 34 17 04 N | 088 14 10 W |
| Oakland Cemetery | Cemetery | 196 | Tippah | 34 58 19 N | 088 58 45 W |
| Oakland Cemetery | Cemetery | 61 | Warren | 32 23 04 N | 090 40 29 W |
| Oakland Cemetery | Cemetery | 39 | Washington | 33 26 30 N | 090 59 15 W |
| Oakland Chapel | Church | 31 | Warren | 32 32 49 N | 090 44 10 W |
| Oakland Church | Church | 141 | Newton | 32 25 28 N | 089 00 12 W |
| Oakland Church | Church | 193 | Tippah | 34 58 07 N | 088 58 35 W |
| Oakland Church | Church | 59 | Warren | 32 22 58 N | 090 40 32 W |
| Oakland Church (historical) | Church | 97 | Chickasaw | 33 47 00 N | 089 02 31 W |
| Oakland College (historical) | School | 76 | Claiborne | 31 52 44 N | 091 08 30 W |
| Oakland Crossing (historical) | Locale | 38 | Washington | 33 25 23 N | 090 55 20 W |
| Oakland Elementary School | School | 108 | Yalobusha | 34 03 28 N | 089 55 04 W |
| Oakland Grove Church | Church | 109 | Jones | 31 45 38 N | 088 56 59 W |
| Oakland Heights Baptist Church | Church | 106 | Lauderdale | 32 21 37 N | 088 44 12 W |
| Oakland Heights Elementary School | School | 105 | Lauderdale | 32 21 41 N | 088 44 20 W |
| Oakland Heights Lake Dam | Dam | 100 | Lauderdale | 32 21 43 N | 088 44 30 W |
| Oakland Heights United Methodist Church | Church | 115 | Lauderdale | 32 22 06 N | 088 44 23 W |
| Oakland High School | School | 117 | Yalobusha | 34 03 24 N | 089 55 04 W |
| Oakland Lake | Lake | 44 | Tallahatchie | 34 01 04 N | 090 11 29 W |
| Oakland Lake Cut -Off | Bend | 44 | Tallahatchie | 34 00 29 N | 090 11 20 W |
| Oakland Memorial Chapel | Church | 75 | Claiborne | 31 52 34 N | 091 08 23 W |
| Oakland Mount Olive Church | Church | 43 | Sunflower | 33 54 20 N | 090 27 28 W |
| Oakland Oil Field | Oilfield | 78 | Adams | 31 40 17 N | 091 19 55 W |
| Oakland Plantation (historical) | Locale | 37 | Washington | 33 25 12 N | 090 55 26 W |
| Oakland School | School | 154 | Alcorn | 34 54 29 N | 088 29 19 W |
| Oakland School | School | 197 | Tippah | 34 58 22 N | 088 58 47 W |
| Oakland School (historical) | School | 119 | Attala | 33 08 48 N | 089 42 35 W |
| Oaklawn | Populated Place | 32 | Claiborne | 32 00 19 N | 090 59 52 W |
| Oaklawn Cemetery | Cemetery | 116 | Amite | 31 05 23 N | 091 03 26 W |
| Oaklawn Cemetery | Cemetery | 54 | Forrest | 31 19 34 N | 089 17 52 W |
| Oaklawn Memorial Park | Cemetery | 164 | Prentiss | 34 40 38 N | 088 36 15 W |
| Oakley | Populated Place | 60 | Hinds | 32 13 04 N | 090 30 11 W |
| Oakley Junior High School | School | 157 | Jefferson Davis | 31 41 29 N | 089 55 22 W |
| Oakley Lake Dam | Dam | 104 | Oktibbeha | 33 23 42 N | 088 46 54 W |
| Oakley State Farm (historical) | Locale | 60 | Hinds | 32 13 06 N | 090 31 30 W |
| Oakley Training School | School | 59 | Hinds | 32 13 09 N | 090 30 16 W |
| Oaklimetal (historical) | Locale | 158 | Benton | 34 39 42 N | 089 06 52 W |
| Oaklimeter Creek | Stream | | Benton | 34 39 23 N | 089 19 34 W |
| Oaklimeter Watershed LT 8-14 Dam | Dam | 133 | Benton | 34 38 00 N | 089 10 24 W |
| Oaklimeter Watershed LT 8-16 Dam | Dam | 135 | Benton | 34 39 18 N | 089 12 42 W |
| Oaklimeter Watershed LT 8-4 | Dam | 137 | Benton | 34 40 00 N | 089 11 00 W |
| Oaklimeter Watershed LT 8-5 Dam | Dam | 137 | Benton | 34 39 54 N | 089 09 18 W |
| Oaklimeter Watershed LT 8-6 Dam | Dam | 132 | Benton | 34 40 12 N | 089 09 00 W |
| Oaklimeter Watershed LT-8-12 Dam | Dam | 159 | Benton | 34 39 42 N | 089 07 00 W |
| Oaklimeter Watershed LT-8-21 Dam | Dam | 141 | Benton | 34 36 48 N | 089 15 54 W |
| Oaklimeter Watershed LT-8-35 Dam | Dam | 127 | Benton | 34 38 24 N | 089 15 30 W |
| Oakohay Cemetery | Cemetery | 120 | Covington | 31 46 05 N | 089 28 55 W |
| Oakohay Creek | Stream | | Covington | 31 43 53 N | 089 25 01 W |
| Oakridge (subdivision) | Populated Place | 92 | Lee | 34 16 07 N | 088 43 27 W |
| Oakridge Cemetery | Cemetery | 52 | Coahoma | 34 12 45 N | 090 36 17 W |
| Oakridge Christian Church | Church | 92 | Lee | 34 16 11 N | 088 43 30 W |
| Oakridge Estates (subdivision) | Populated Place | 72 | Clay | 33 37 55 N | 088 41 20 W |
| Oaks | Populated Place | 79 | Madison | 32 47 59 N | 089 58 37 W |
| Oaks Country Club | Locale | 130 | Union | 34 25 54 N | 089 00 49 W |
| Oakvale Methodist Church | Church | 144 | Covington | 31 42 08 N | 089 43 19 W |
| Oakvale School (historical) | School | 144 | Covington | 31 42 08 N | 089 43 19 W |
| Oakwood Branch | Stream | | Perry | 31 13 19 N | 088 51 15 W |
| Oakwood Cemetery | Cemetery | 151 | Montgomery | 33 29 00 N | 089 44 34 W |
| Oakwood Cemetery | Cemetery | 58 | Tunica | 34 41 16 N | 090 24 10 W |
| Oakwood Estates (subdivision) | Populated Place | 91 | Oktibbeha | 33 26 30 N | 088 53 58 W |
| Oakwood Landing (historical) | Locale | 38 | Leflore | 33 26 07 N | 090 14 09 W |
| Oakwood Plaza Shopping Center | Locale | 115 | Lafayette | 34 21 44 N | 089 33 35 W |
| Oaky Creek | Stream | | Clarke | 32 03 50 N | 088 47 30 W |
| Oatis Cemetery | Cemetery | 102 | Jefferson Davis | 31 33 06 N | 089 57 01 W |
| Obadiah | Populated Place | 148 | Lauderdale | 32 30 45 N | 088 43 36 W |
| Obed Magee Cemetery | Cemetery | 115 | Walthall | 31 09 27 N | 090 13 30 W |
| Ocala (historical) | Locale | 154 | Tippah | 34 51 28 N | 088 51 34 W |
| Ocean Springs | Populated Place | 7 | Jackson | 30 24 41 N | 088 49 40 W |
| Ocean Springs City Hall | Building | 7 | Jackson | 30 24 41 N | 088 49 37 W |
| Ocean Springs City Park | Park | 7 | Jackson | 30 24 14 N | 088 48 11 W |
| Ocean Springs High School | School | 7 | Jackson | 30 24 41 N | 088 48 33 W |
| Ocean Springs Hospital | Hospital | 7 | Jackson | 30 24 52 N | 088 45 51 W |
| Ocean Springs Junior High School | School | 7 | Jackson | 30 24 46 N | 088 48 30 W |
| Ocean Springs Post Office | Post Office | 7 | Jackson | 30 24 50 N | 088 49 41 W |
| Ocean Springs Presbyterian Church | Church | 4 | Jackson | 30 24 29 N | 088 49 43 W |
| Ocean Springs Public Library | Building | 7 | Jackson | 30 24 41 N | 088 49 38 W |
| Oco (historical) | Locale | 162 | Union | 34 33 24 N | 089 11 26 W |
| Ocobla | Populated Place | 164 | Neshoba | 32 45 17 N | 089 01 31 W |
| Ocobla Creek | Stream | | Neshoba | 32 50 56 N | 089 04 43 W |
| Ocohay (historical) | Locale | 120 | Covington | 31 46 01 N | 089 28 55 W |
| Ocopla Baptist Church | Church | 160 | Neshoba | 32 45 21 N | 089 01 04 W |
| Odd Fellows Cemetery | Cemetery | 111 | Hinds | 32 20 06 N | 090 19 05 W |
| Odd Fellows Cemetery | Cemetery | 78 | Holmes | 33 07 00 N | 090 02 02 W |