Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Our Lady of the Lake School | School | 2 | St. Tammany | 30 21 28 N | 090 04 08 W |
| Our Lady of the Rosary Church | Church | 47 | Natchitoches | 31 55 33 N | 093 02 28 W |
| Our Lady of the Sea Catholic Church | Church | 0 | Orleans | 29 58 38 N | 090 03 07 W |
| Our Lady of the Sea School | School | 0 | Orleans | 29 58 40 N | 090 03 06 W |
| Our Lady of Victory Catholic Church | Church | 4 | Iberia | 29 55 04 N | 091 39 49 W |
| Our Lady of Victory Catholic Church | Church | 6 | Iberia | 30 03 16 N | 091 44 11 W |
| Our Lady of Victory School | School | 23 | Avoyelles | 31 03 41 N | 092 02 55 W |
| Our Lady Queen of Angels Catholic Church | Church | 18 | St. Landry | 30 30 44 N | 092 04 58 W |
| Our Lady Queen of Heaven Catholic Church | Church | 3 | Calcasieu | 30 11 09 N | 093 13 42 W |
| Our Lady Queen of Heaven School | Church | 3 | Calcasieu | 30 11 08 N | 093 13 42 W |
| Our Lady Queen of Peace Catholic Church | Church | 13 | Lafayette | 30 15 03 N | 092 01 49 W |
| Our Lady Star of the Sea School | School | 0 | Orleans | 29 58 40 N | 090 03 07 W |
| Our Mother of Mercy Catholic Church | Church | 9 | Acadia | 30 14 33 N | 092 16 27 W |
| Our Mother of Peace School | School | 14 | Acadia | 30 24 28 N | 092 12 56 W |
| Our Mother of Perpetual Help Catholic Chapel | Church | 1 | Orleans | 29 55 51 N | 090 05 00 W |
| Our Savior Lutheran Church | Church | 67 | Caddo | 32 24 10 N | 093 47 26 W |
| Our Saviour Lutheran Church | Church | 12 | East Baton Rouge | 30 25 12 N | 091 00 46 W |
| Our Saviour School | School | -2 | Orleans | 30 01 19 N | 090 03 46 W |
| Outfall Canal | Canal | 4 | Jefferson | 29 54 32 N | 090 15 21 W |
| Outfall Canal | Canal | -3 | Jefferson | 29 52 49 N | 090 00 56 W |
| Outlet E-1 | Channel | 0 | Plaquemines | 29 00 44 N | 089 20 10 W |
| Outlet E-2 | Channel | 0 | Plaquemines | 29 01 06 N | 089 19 51 W |
| Outlet E-3 | Channel | 2 | Plaquemines | 29 01 17 N | 089 19 43 W |
| Outlet W-1 | Channel | 2 | Plaquemines | 29 01 16 N | 089 20 54 W |
| Outlet W-2 | Channel | -4 | Plaquemines | 29 01 58 N | 089 20 25 W |
| Outside Bayou | Gut | 1 | St. Mary | 29 30 13 N | 091 20 21 W |
| Outside Island | Island | 2 | Vermilion | 29 49 20 N | 092 22 16 W |
| Outside Island Gas Field | Oilfield | 0 | Vermilion | 29 51 19 N | 092 24 15 W |
| Ouzts Branch | Stream | | Bienville | 32 11 32 N | 093 02 44 W |
| Overflow Creek | Stream | | Morehouse | 32 58 47 N | 091 41 59 W |
| Overton (historical) | Populated Place | 57 | Webster | 32 35 16 N | 093 18 13 W |
| Overton Airport | Airport | 34 | East Baton Rouge | 30 42 28 N | 090 52 27 W |
| Overton Cemetery | Cemetery | 43 | East Feliciana | 30 44 14 N | 091 07 14 W |
| Overton Cemetery | Cemetery | 62 | East Feliciana | 30 48 43 N | 091 02 48 W |
| Overton Cemetery | Cemetery | 64 | Webster | 32 35 26 N | 093 18 11 W |
| Overton Lock and Dam | Dam | 27 | Rapides | 31 11 06 N | 092 18 06 W |
| Owen Cemetery | Cemetery | 98 | Claiborne | 32 58 39 N | 093 02 17 W |
| Owen Industrial Park | Locale | 17 | East Baton Rouge | 30 28 28 N | 091 06 48 W |
| Owens Cemetery | Cemetery | 58 | Washington | 30 43 18 N | 090 09 11 W |
| Owens Creek | Stream | | Union | 32 49 44 N | 092 17 38 W |
| Owens Lake | Lake | 6 | Calcasieu | 30 20 00 N | 093 45 30 W |
| Owl Bayou | Stream | | Tangipahoa | 30 18 48 N | 090 24 57 W |
| Owl Creek | Stream | | Union | 32 52 13 N | 092 23 57 W |
| Ox Bow Bend | Bend | 12 | Caldwell | 32 05 39 N | 091 52 46 W |
| Ox Lake | Lake | 16 | Concordia | 31 44 34 N | 091 35 24 W |
| Ox Lot Slough | Gut | 21 | Washington | 30 44 12 N | 089 50 20 W |
| Oxbow | Populated Place | 40 | Red River | 32 01 28 N | 093 23 45 W |
| Oxford | Populated Place | 81 | De Soto | 31 55 25 N | 093 37 41 W |
| Oxford | Populated Place | 4 | St. Mary | 29 51 15 N | 091 28 43 W |
| Oxford Gas Field | Oilfield | 99 | De Soto | 31 53 26 N | 093 35 51 W |
| Oxford Place (subdivision) | Populated Place | 14 | East Baton Rouge | 30 25 10 N | 091 04 48 W |
| Oxford Post Office | Post Office | 81 | De Soto | 31 55 44 N | 093 37 52 W |
| Oxidation Pond Number One Dam | Dam | 10 | Tangipahoa | 30 29 01 N | 090 28 36 W |
| Oxidation Pond Number Two Dam | Dam | 10 | Livingston | 30 27 07 N | 090 55 48 W |
| Oxpen Creek | Stream | | Winn | 31 58 57 N | 092 26 30 W |
| Oxy USA Incorporated Heliport | Airport | 1 | St. Mary | 29 41 03 N | 091 13 10 W |
| Oyster Bay | Bay | 4 | St. Bernard | 30 06 27 N | 089 14 10 W |
| Oyster Bay | Gut | 0 | St. Bernard | 29 47 31 N | 089 38 20 W |
| Oyster Bay Oil Field | Oilfield | 0 | Terrebonne | 29 15 26 N | 091 07 57 W |
| Oyster Bayou | Gut | 0 | Iberia | 29 28 44 N | 091 49 21 W |
| Oyster Bayou | Gut | 1 | Terrebonne | 29 08 36 N | 090 43 00 W |
| Oyster Bayou | Gut | 0 | Terrebonne | 29 14 01 N | 091 08 10 W |
| Oyster Bayou | Stream | | Cameron | 29 47 06 N | 093 22 41 W |
| Oyster Bayou | Stream | | St. Mary | 29 35 31 N | 091 32 22 W |
| Oyster Bayou | Stream | | Terrebonne | 29 17 42 N | 090 30 26 W |
| Oyster Bayou Inner End Light | Locale | 4 | Terrebonne | 29 15 41 N | 091 08 07 W |
| Oyster Bayou Lighthouse | Locale | 3 | Terrebonne | 29 12 43 N | 091 07 49 W |
| Oyster Lake | Lake | 0 | Cameron | 29 47 52 N | 093 23 38 W |
| Oyster Lake | Lake | 8 | Iberia | 29 31 32 N | 091 52 07 W |
| Ozone Acres (subdivision) | Populated Place | 2 | St. Tammany | 30 16 39 N | 089 50 24 W |
| Ozone Park | Park | 2 | Orleans | 30 01 37 N | 090 05 28 W |
| Ozone Pines (subdivision) | Populated Place | 6 | St. Tammany | 30 18 43 N | 089 44 06 W |
| Ozone Woods (subdivision) | Populated Place | 4 | St. Tammany | 30 17 36 N | 089 50 35 W |
| P A Capdau Junior High School | School | 0 | Orleans | 29 59 54 N | 090 03 00 W |
| P G T Beauregard Middle School | School | 2 | St. Bernard | 29 52 07 N | 089 51 54 W |
| P H I Heliport | Airport | 3 | Jefferson | 29 56 35 N | 090 11 06 W |
| P-Kaw-Shun Creek | Stream | | Tangipahoa | 30 30 00 N | 090 17 13 W |
| P+l Ranch Pond | Reservoir | 23 | St. Tammany | 30 34 49 N | 090 12 18 W |
| P+l Ranch Pond Dam | Dam | 23 | St. Tammany | 30 34 49 N | 090 12 18 W |
| Pace | Populated Place | 58 | Webster | 32 39 56 N | 093 19 20 W |
| Pace Cemetery | Cemetery | 35 | Natchitoches | 31 50 25 N | 092 58 16 W |
| Pace Lake | Lake | 15 | Ouachita | 32 38 42 N | 092 07 39 W |
| Pace School | School | 35 | Natchitoches | 31 49 43 N | 092 58 23 W |
| Packenham Mobile Home Park | Populated Place | 2 | St. Bernard | 29 55 47 N | 089 57 15 W |
| Packer Branch | Stream | | Vernon | 31 09 32 N | 093 32 10 W |
| Packer Swamp | Swamp | 35 | Vernon | 31 10 24 N | 093 31 44 W |
| Packton | Populated Place | 46 | Winn | 31 47 52 N | 092 34 37 W |
| Paddy Bay | Bay | 2 | Plaquemines | 29 10 55 N | 089 07 39 W |
| Padget Branch | Stream | | Rapides | 31 06 04 N | 092 44 39 W |
| Padre Bayou | Gut | 1 | St. Bernard | 29 56 09 N | 089 33 55 W |
| Page Bayou | Stream | | Caddo | 32 30 33 N | 093 54 09 W |
| Page Church | Church | 69 | Caddo | 32 28 50 N | 093 55 29 W |
| Page Lake | Lake | 13 | St. Tammany | 30 37 00 N | 089 50 27 W |
| Pailet Canal | Canal | 0 | Jefferson | 29 43 09 N | 090 07 39 W |
| Pailleen Queue Pond | Bay | -3 | Plaquemines | 29 11 27 N | 089 09 38 W |
| Paincourtville | Populated Place | 5 | Assumption | 29 59 25 N | 091 03 18 W |
| Paincourtville Post Office | Post Office | 6 | Assumption | 29 59 36 N | 091 03 17 W |
| Painted Bluffs | Cliff | 11 | East Baton Rouge | 30 39 56 N | 091 17 25 W |
| Pakenham Oaks | Park | 2 | St. Bernard | 29 56 05 N | 089 58 07 W |
| Palestine Cemetery | Cemetery | 59 | Caldwell | 32 14 28 N | 092 16 55 W |
| Palestine Cemetery | Cemetery | 27 | Richland | 32 33 55 N | 091 29 37 W |
| Palestine Church | Church | 28 | Allen | 30 46 06 N | 092 56 25 W |
| Palestine Church | Church | 64 | Bossier | 32 33 46 N | 093 36 31 W |
| Palestine Church | Church | 59 | Caldwell | 32 14 25 N | 092 16 57 W |
| Palestine Church | Church | 34 | Washington | 30 41 38 N | 089 53 42 W |
| Palestine School (historical) | School | 47 | Caddo | 32 19 39 N | 093 35 01 W |
| Palion Talion School (historical) | School | 32 | Natchitoches | 31 32 44 N | 092 53 31 W |
| Palm Hills (subdivision) | Populated Place | 15 | East Baton Rouge | 30 25 41 N | 091 06 09 W |
| Palm Lake (subdivision) | Populated Place | 1 | St. Tammany | 30 15 53 N | 089 47 35 W |
| Palmer Church | Church | 40 | Rapides | 31 15 29 N | 092 19 50 W |