| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| O'Neal Place | city | Louisiana | United States | 30.43 | -91.00 | 22 | |
| OK Landing | city | Louisiana | United States | 31.77 | -91.56 | 49 | |
| Oak Alley | city | Louisiana | United States | 29.99 | -90.77 | 9 | |
| Oak Cluster | city | Louisiana | United States | 30.51 | -91.01 | 36 | |
| Oak Dale Landing | city | Louisiana | United States | 31.83 | -91.57 | 59 | |
| Oak Forest | city | Louisiana | United States | 29.63 | -90.93 | 3 | |
| Oak Forest | city | Louisiana | United States | 30.48 | -91.08 | 55 | |
| Oak Forest Mobile Home Park | city | Louisiana | United States | 30.39 | -90.86 | 22 | |
| Oak Glen Terrace Mobile Home Park | city | Louisiana | United States | 30.56 | -91.15 | 59 | |
| Oak Grove | city | Louisiana | United States | 30.32 | -90.97 | 19 | |
| Oak Grove | city | Louisiana | United States | 32.50 | -92.87 | 364 | |
| Oak Grove | city | Louisiana | United States | 32.86 | -91.39 | 111 | |
| Oak Grove | city | Louisiana | United States | 31.77 | -93.15 | 134 | |
| Oak Grove | city | Louisiana | United States | 31.52 | -92.54 | 196 | |
| Oak Grove | city | Louisiana | United States | 31.79 | -93.64 | 246 | |
| Oak Grove | city | Louisiana | United States | 29.76 | -93.11 | 0 | |
| Oak Grove Estates | city | Louisiana | United States | 30.32 | -89.74 | 26 | |
| Oak Harbor | city | Louisiana | United States | 30.23 | -89.79 | 6 | |
| Oak Hill | city | Louisiana | United States | 32.01 | -93.75 | 357 | |
| Oak Hill | city | Louisiana | United States | 30.45 | -91.07 | 42 | |
| Oak Hills | city | Louisiana | United States | 30.36 | -91.09 | 29 | |
| Oak Hills Place | city | Louisiana | United States | 30.36 | -91.09 | 22 | |
| Oak Hurst Mobile Home Park | city | Louisiana | United States | 30.23 | -93.11 | 13 | |
| Oak Landing | city | Louisiana | United States | 32.96 | -91.72 | 98 | |
| Oak Manor Estates | city | Louisiana | United States | 30.31 | -89.85 | 19 | |
| Oak Park | city | Louisiana | United States | 30.46 | -91.07 | 42 | |
| Oak Park Estates Mobile Home Park | city | Louisiana | United States | 30.22 | -92.06 | 29 | |
| Oak Park II Mobile Home Park | city | Louisiana | United States | 29.77 | -90.08 | 3 | |
| Oak Park Mobile Homes Court | city | Louisiana | United States | 31.31 | -92.46 | 78 | |
| Oak Ridge | city | Louisiana | United States | 30.28 | -89.81 | 9 | |
| Oak Ridge | city | Louisiana | United States | 32.62 | -91.77 | 88 | |
| Oak Ridge | city | Louisiana | United States | 30.54 | -90.41 | 42 | |
| Oak Ridge | city | Louisiana | United States | 32.38 | -92.51 | 249 | |
| Oak Ridge Park | city | Louisiana | United States | 29.99 | -90.13 | 3 | |
| Oak Ridge Park | city | Louisiana | United States | 29.91 | -89.89 | 3 | |
| Oak Shadows Place | city | Louisiana | United States | 30.52 | -91.03 | 49 | |
| Oak Thicket Acres | city | Louisiana | United States | 32.56 | -93.62 | 196 | |
| Oak Valley | city | Louisiana | United States | 30.43 | -91.10 | 45 | |
| Oak Villa Mobile Home Park | city | Louisiana | United States | 30.49 | -90.15 | 22 | |
| Oakbrook | city | Louisiana | United States | 30.37 | -91.08 | 22 | |
| Oakcreek Estates Mobile Home Park | city | Louisiana | United States | 30.30 | -93.23 | 16 | |
| Oakcrest | city | Louisiana | United States | 30.48 | -91.09 | 55 | |
| Oakdale | city | Louisiana | United States | 30.82 | -92.66 | 114 | |
| Oakhill | city | Louisiana | United States | 31.76 | -93.15 | 147 | |
| Oakland | city | Louisiana | United States | 30.59 | -91.41 | 26 | |
| Oakland | city | Louisiana | United States | 32.47 | -93.51 | 190 | |
| Oakland | city | Louisiana | United States | 33.00 | -92.35 | 249 | |
| Oaklawn | city | Louisiana | United States | 30.30 | -89.92 | 19 | |
| Oaklawn | city | Louisiana | United States | 29.84 | -91.45 | 6 | |
| Oakleaf Estates | city | Louisiana | United States | 31.76 | -93.14 | 147 | |
| Oakley | city | Louisiana | United States | 32.00 | -91.62 | 55 | |
| Oakley | city | Louisiana | United States | 30.27 | -91.10 | 19 | |
| Oakley | city | Louisiana | United States | 29.87 | -91.01 | 13 | |
| Oakley Landing | city | Louisiana | United States | 32.03 | -91.62 | 49 | |
| Oakmont | city | Louisiana | United States | 30.32 | -89.82 | 19 | |
| Oaknolia | city | Louisiana | United States | 30.73 | -90.99 | 137 | |
| Oaks | city | Louisiana | United States | 32.92 | -93.12 | 328 | |
| Oakshire Manor | city | Louisiana | United States | 29.65 | -90.76 | 3 | |
| Oakville | city | Louisiana | United States | 29.78 | -90.03 | 3 | |
| Oakwood | city | Louisiana | United States | 30.25 | -89.78 | 9 | |
| Oakwood Forest | city | Louisiana | United States | 30.47 | -91.06 | 45 | |
| Oakwood Landing | city | Louisiana | United States | 32.06 | -91.57 | 49 | |
| Oasis | city | Louisiana | United States | 31.41 | -92.71 | 104 | |
| Oberlin | city | Louisiana | United States | 30.62 | -92.76 | 62 | |
| Oden (historical) | city | Louisiana | United States | 31.11 | -92.51 | 147 | |
| Odenburg | city | Louisiana | United States | 30.92 | -91.81 | 9 | |
| Odom (historical) | city | Louisiana | United States | 31.37 | -92.75 | 147 | |
| Odra | city | Louisiana | United States | 31.60 | -92.84 | 98 | |
| Ogden Park | city | Louisiana | United States | 30.45 | -91.16 | 49 | |
| Oil City | city | Louisiana | United States | 32.74 | -93.97 | 206 | |
| Okaloosa | city | Louisiana | United States | 32.38 | -92.33 | 196 | |
| Oklahoma | city | Louisiana | United States | 31.01 | -92.21 | 62 | |
| Old Athens | city | Louisiana | United States | 32.65 | -93.06 | 396 | |
| Old Castor | city | Louisiana | United States | 32.27 | -93.13 | 236 | |
| Old Jefferson | city | Louisiana | United States | 30.38 | -91.02 | 22 | |
| Old Montgomery (historical) | city | Louisiana | United States | 31.66 | -92.90 | 114 | |
| Old Mount Pleasant (historical) | city | Louisiana | United States | 32.15 | -92.19 | 154 | |
| Old Newport (historical) | city | Louisiana | United States | 32.11 | -92.34 | 177 | |
| Old Pleasant Hill | city | Louisiana | United States | 31.86 | -93.51 | 337 | |
| Old Saline | city | Louisiana | United States | 32.19 | -93.01 | 259 | |
| Old Shell Beach | city | Louisiana | United States | 29.87 | -89.68 | 3 | |
| Old Shongaloo | city | Louisiana | United States | 32.99 | -93.31 | 324 | |
| Old Ten | city | Louisiana | United States | 32.52 | -92.14 | 62 | |
| Oldfield | city | Louisiana | United States | 30.63 | -90.84 | 88 | |
| Olga | city | Louisiana | United States | 29.35 | -89.40 | 3 | |
| Oliva Mobile Home Park | city | Louisiana | United States | 30.04 | -91.93 | 29 | |
| Olive Branch | city | Louisiana | United States | 30.74 | -91.06 | 121 | |
| Oliver | city | Louisiana | United States | 30.49 | -90.46 | 39 | |
| Oliver | city | Louisiana | United States | 32.58 | -92.06 | 72 | |
| Olivier | city | Louisiana | United States | 29.98 | -91.76 | 13 | |
| Olla | city | Louisiana | United States | 31.90 | -92.24 | 160 | |
| Ollie | city | Louisiana | United States | 29.74 | -90.02 | 9 | |
| Olympic Landing | city | Louisiana | United States | 31.76 | -91.55 | 49 | |
| Omega | city | Louisiana | United States | 32.52 | -91.14 | 82 | |
| Omega | city | Louisiana | United States | 31.57 | -91.80 | 49 | |
| Omo (historical) | city | Louisiana | United States | 30.81 | -92.26 | 45 | |
| One North Place | city | Louisiana | United States | 32.61 | -93.84 | 183 | |
| Oneida | city | Louisiana | United States | 30.02 | -90.80 | 13 | |
| Opelousas | city | Louisiana | United States | 30.53 | -92.08 | 59 | |
| Orange Grove Plantation | city | Louisiana | United States | 29.85 | -90.81 | 3 | |
| Orchard | city | Louisiana | United States | 29.27 | -89.35 | 3 | |
| Oretta | city | Louisiana | United States | 30.53 | -93.44 | 82 | |
| Oriza (historical) | city | Louisiana | United States | 30.26 | -92.51 | 19 | |
| Orlandos Mobile Home Park | city | Louisiana | United States | 29.98 | -90.20 | 3 | |
| Orleans Parish | city | Louisiana | United States | 29.95 | -90.08 | 3 | |
| Orr (historical) | city | Louisiana | United States | 30.47 | -91.03 | 36 | |
| Osburn | city | Louisiana | United States | 30.92 | -92.70 | 131 | |
| Oscar | city | Louisiana | United States | 30.62 | -91.46 | 22 | |
| Osceola | city | Louisiana | United States | 30.65 | -90.31 | 121 | |
| Osceola | city | Louisiana | United States | 31.97 | -91.25 | 59 | |
| Oshkosh (historical) | city | Louisiana | United States | 32.03 | -92.99 | 249 | |
| Ossun | city | Louisiana | United States | 30.28 | -92.11 | 36 | |
| Ostrica | city | Louisiana | United States | 29.37 | -89.53 | 3 | |
| Otis | city | Louisiana | United States | 31.22 | -92.73 | 216 | |
| Ouachita City | city | Louisiana | United States | 32.73 | -92.07 | 78 | |
| Oubre | city | Louisiana | United States | 30.02 | -90.71 | 9 | |
| Oubre | city | Louisiana | United States | 30.06 | -91.74 | 16 | |
| Overton (historical) | city | Louisiana | United States | 32.59 | -93.30 | 164 | |
| Oxbow | city | Louisiana | United States | 32.02 | -93.40 | 127 | |
| Oxford | city | Louisiana | United States | 31.92 | -93.63 | 249 | |
| Oxford | city | Louisiana | United States | 29.85 | -91.48 | 6 | |
| Oxford Place | city | Louisiana | United States | 30.42 | -91.08 | 36 | |
| Ozone Acres | city | Louisiana | United States | 30.28 | -89.84 | 9 | |
| Ozone Pines | city | Louisiana | United States | 30.31 | -89.74 | 19 | |
| Ozone Woods | city | Louisiana | United States | 30.29 | -89.84 | 19 |