| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| O'Neal Place | city | Louisiana | United States | 30.43389 | -91.00167 | 22 | 85034 |
| OK Landing | city | Louisiana | United States | 31.76944 | -91.56056 | 49 | 514 |
| Oak Alley | city | Louisiana | United States | 29.98667 | -90.77056 | 9 | 3539 |
| Oak Cluster | city | Louisiana | United States | 30.51472 | -91.00889 | 36 | 37517 |
| Oak Dale Landing | city | Louisiana | United States | 31.82861 | -91.56806 | 59 | 358 |
| Oak Forest | city | Louisiana | United States | 29.63139 | -90.93278 | 3 | 1826 |
| Oak Forest subdivision | city | Louisiana | United States | 30.48417 | -91.0775 | 55 | 88337 |
| Oak Grove | city | Louisiana | United States | 31.78722 | -93.64472 | 246 | 846 |
| Oak Grove | city | Louisiana | United States | 31.77361 | -93.14889 | 134 | 7922 |
| Oak Grove | city | Louisiana | United States | 29.75667 | -93.11389 | 0 | 162 |
| Oak Grove | city | Louisiana | United States | 32.49639 | -92.86583 | 364 | 1132 |
| Oak Grove | city | Louisiana | United States | 31.52 | -92.54222 | 196 | 2225 |
| Oak Grove | city | Louisiana | United States | 32.86083 | -91.38833 | 111 | 2020 |
| Oak Grove | city | Louisiana | United States | 30.31778 | -90.97472 | 19 | 20722 |
| Oak Grove Estates subdivision | city | Louisiana | United States | 30.31972 | -89.74444 | 26 | 29750 |
| Oak Harbor subdivision | city | Louisiana | United States | 30.22944 | -89.7925 | 6 | 26077 |
| Oak Hill | city | Louisiana | United States | 32.01278 | -93.74778 | 357 | 4421 |
| Oak Hill subdivision | city | Louisiana | United States | 30.44806 | -91.07444 | 42 | 104467 |
| Oak Hills | city | Louisiana | United States | 30.3625 | -91.08778 | 22 | 44419 |
| Oak Hills Place | city | Louisiana | United States | 30.35972 | -91.0875 | 22 | 44419 |
| Oak Landing | city | Louisiana | United States | 32.96139 | -91.71722 | 98 | 480 |
| Oak Manor Estates subdivision | city | Louisiana | United States | 30.30778 | -89.84806 | 19 | 15401 |
| Oak Park Mobile Homes Court | city | Louisiana | United States | 31.30611 | -92.45556 | 78 | 48074 |
| Oak Park subdivision | city | Louisiana | United States | 30.45917 | -91.07194 | 42 | 88337 |
| Oak Ridge | city | Louisiana | United States | 32.38194 | -92.50917 | 249 | 559 |
| Oak Ridge | city | Louisiana | United States | 32.62389 | -91.77278 | 88 | 975 |
| Oak Ridge | city | Louisiana | United States | 30.53806 | -90.40833 | 42 | 11504 |
| Oak Ridge Park | city | Louisiana | United States | 29.99028 | -90.12833 | 3 | 236420 |
| Oak Ridge Park | city | Louisiana | United States | 29.91194 | -89.89167 | 3 | 21677 |
| Oak Ridge subdivision | city | Louisiana | United States | 30.28 | -89.80944 | 9 | 41227 |
| Oak Shadows Place | city | Louisiana | United States | 30.52167 | -91.0325 | 49 | 37517 |
| Oak Thicket Acres | city | Louisiana | United States | 32.56389 | -93.61806 | 196 | 7303 |
| Oak Valley subdivision | city | Louisiana | United States | 30.43278 | -91.09889 | 45 | 128158 |
| Oakbrook | city | Louisiana | United States | 30.37306 | -91.07889 | 22 | 43820 |
| Oakcrest subdivision | city | Louisiana | United States | 30.47917 | -91.09417 | 55 | 126139 |
| Oakdale | city | Louisiana | United States | 30.81583 | -92.66028 | 114 | 7620 |
| Oakdale | city | Louisiana | United States | 30.80528 | -92.62139 | 104 | 5439 |
| Oakhill | city | Louisiana | United States | 31.76194 | -93.14778 | 147 | 7922 |
| Oakland | city | Louisiana | United States | 32.46806 | -93.50944 | 190 | 3950 |
| Oakland | city | Louisiana | United States | 32.99556 | -92.35056 | 249 | 668 |
| Oakland | city | Louisiana | United States | 30.59444 | -91.40889 | 26 | 2930 |
| Oaklawn | city | Louisiana | United States | 29.84111 | -91.4525 | 6 | 3897 |
| Oaklawn | city | Louisiana | United States | 30.29861 | -89.92111 | 19 | 7883 |
| Oakleaf Estates | city | Louisiana | United States | 31.76361 | -93.13667 | 147 | 7922 |
| Oakley | city | Louisiana | United States | 31.99806 | -91.61972 | 55 | 1024 |
| Oakley | city | Louisiana | United States | 30.26889 | -91.10389 | 19 | 7583 |
| Oakley | city | Louisiana | United States | 29.87361 | -91.01194 | 13 | 2342 |
| Oakley Landing | city | Louisiana | United States | 32.03111 | -91.61972 | 49 | 981 |
| Oakmont subdivision | city | Louisiana | United States | 30.32222 | -89.82389 | 19 | 34074 |
| Oaknolia | city | Louisiana | United States | 30.73278 | -90.99056 | 137 | 2373 |
| Oaks | city | Louisiana | United States | 32.92 | -93.11861 | 328 | 2547 |
| Oakshire Manor | city | Louisiana | United States | 29.64667 | -90.75667 | 3 | 25918 |
| Oakville | city | Louisiana | United States | 29.78278 | -90.02639 | 3 | 6274 |
| Oakwood Forest subdivision | city | Louisiana | United States | 30.46667 | -91.06 | 45 | 88337 |
| Oakwood Landing | city | Louisiana | United States | 32.06056 | -91.57472 | 49 | 839 |
| Oakwood subdivision | city | Louisiana | United States | 30.25139 | -89.78333 | 9 | 45329 |
| Oasis | city | Louisiana | United States | 31.41306 | -92.71472 | 104 | 2027 |
| Oberlin | city | Louisiana | United States | 30.62 | -92.7625 | 62 | 1438 |
| Oden historical | city | Louisiana | United States | 31.11444 | -92.50611 | 147 | 972 |
| Odenburg | city | Louisiana | United States | 30.92028 | -91.81056 | 9 | 1352 |
| Odom historical | city | Louisiana | United States | 31.36583 | -92.75417 | 147 | 1121 |
| Odra | city | Louisiana | United States | 31.59694 | -92.83611 | 98 | 690 |
| Ogden Park subdivision | city | Louisiana | United States | 30.44583 | -91.15667 | 49 | 133616 |
| Oil City | city | Louisiana | United States | 32.74389 | -93.97139 | 206 | 2102 |
| Okaloosa | city | Louisiana | United States | 32.38 | -92.32778 | 196 | 3794 |
| Oklahoma | city | Louisiana | United States | 31.00861 | -92.20833 | 62 | 3898 |
| Old Athens | city | Louisiana | United States | 32.64556 | -93.0575 | 396 | 631 |
| Old Castor | city | Louisiana | United States | 32.26667 | -93.12583 | 236 | 772 |
| Old Jefferson | city | Louisiana | United States | 30.3825 | -91.01694 | 22 | 68941 |
| Old Montgomery historical | city | Louisiana | United States | 31.65889 | -92.9 | 114 | 746 |
| Old Mount Pleasant historical | city | Louisiana | United States | 32.15 | -92.18972 | 154 | 691 |
| Old Newport historical | city | Louisiana | United States | 32.105 | -92.34028 | 177 | 484 |
| Old Pleasant Hill | city | Louisiana | United States | 31.85556 | -93.51306 | 337 | 693 |
| Old Saline | city | Louisiana | United States | 32.18528 | -93.01389 | 259 | 428 |
| Old Shell Beach | city | Louisiana | United States | 29.86639 | -89.67833 | 3 | 127 |
| Old Shongaloo | city | Louisiana | United States | 32.99167 | -93.31 | 324 | 769 |
| Old Ten | city | Louisiana | United States | 32.52028 | -92.13611 | 62 | 52187 |
| Oldfield | city | Louisiana | United States | 30.62722 | -90.84444 | 88 | 4732 |
| Olga | city | Louisiana | United States | 29.34639 | -89.40278 | 3 | 884 |
| Olive Branch | city | Louisiana | United States | 30.74389 | -91.06194 | 121 | 3473 |
| Oliver | city | Louisiana | United States | 32.57917 | -92.0625 | 72 | 35884 |
| Oliver | city | Louisiana | United States | 30.49361 | -90.45778 | 39 | 23389 |
| Olivier | city | Louisiana | United States | 29.97528 | -91.75583 | 13 | 22961 |
| Olla | city | Louisiana | United States | 31.90278 | -92.24306 | 160 | 1093 |
| Ollie | city | Louisiana | United States | 29.74278 | -90.0175 | 9 | 1460 |
| Olympic Landing | city | Louisiana | United States | 31.75778 | -91.55056 | 49 | 514 |
| Omega | city | Louisiana | United States | 31.57167 | -91.80333 | 49 | 2013 |
| Omega | city | Louisiana | United States | 32.51639 | -91.13944 | 82 | 320 |
| Omo historical | city | Louisiana | United States | 30.8075 | -92.26111 | 45 | 1773 |
| One North Place | city | Louisiana | United States | 32.60694 | -93.84306 | 183 | 8069 |
| Oneida | city | Louisiana | United States | 30.01917 | -90.79778 | 13 | 2105 |
| Opelousas | city | Louisiana | United States | 30.53333 | -92.08139 | 59 | 24136 |
| Orange Grove Plantation | city | Louisiana | United States | 29.84889 | -90.81139 | 3 | 8631 |
| Orchard | city | Louisiana | United States | 29.26861 | -89.35444 | 3 | 513 |
| Oretta | city | Louisiana | United States | 30.52583 | -93.43722 | 82 | 2490 |
| Oriza historical | city | Louisiana | United States | 30.25722 | -92.50694 | 19 | 2030 |
| Orlandos Mobile Home Park | city | Louisiana | United States | 29.97778 | -90.1975 | 3 | 204530 |
| Orr historical | city | Louisiana | United States | 30.47444 | -91.0325 | 36 | 68562 |
| Osburn | city | Louisiana | United States | 30.92111 | -92.6975 | 131 | 1364 |
| Oscar | city | Louisiana | United States | 30.615 | -91.46111 | 22 | 2781 |
| Osceola | city | Louisiana | United States | 31.96944 | -91.25278 | 59 | 640 |
| Osceola | city | Louisiana | United States | 30.65056 | -90.31139 | 121 | 1897 |
| Oshkosh historical | city | Louisiana | United States | 32.02972 | -92.99222 | 249 | 467 |
| Ossun | city | Louisiana | United States | 30.27583 | -92.11222 | 36 | 23856 |
| Ostrica | city | Louisiana | United States | 29.36806 | -89.52917 | 3 | 3627 |
| Otis | city | Louisiana | United States | 31.21528 | -92.72778 | 216 | 1141 |
| Ouachita City | city | Louisiana | United States | 32.725 | -92.07083 | 52 | 1716 |
| Oubre | city | Louisiana | United States | 30.06222 | -91.73667 | 16 | 5197 |
| Oubre | city | Louisiana | United States | 30.01667 | -90.70806 | 9 | 7957 |
| Overton historical | city | Louisiana | United States | 32.5875 | -93.30333 | 164 | 14546 |
| Oxbow | city | Louisiana | United States | 32.02417 | -93.39556 | 127 | 1625 |
| Oxford | city | Louisiana | United States | 31.92333 | -93.62778 | 249 | 2430 |
| Oxford | city | Louisiana | United States | 29.85389 | -91.47861 | 6 | 6701 |
| Oxford Place subdivision | city | Louisiana | United States | 30.41917 | -91.08 | 36 | 104467 |
| Ozone Acres subdivision | city | Louisiana | United States | 30.27722 | -89.84 | 9 | 18802 |
| Ozone Pines subdivision | city | Louisiana | United States | 30.31167 | -89.735 | 19 | 29750 |
| Ozone Woods subdivision | city | Louisiana | United States | 30.29306 | -89.84306 | 19 | 15401 |