O'Donnell - Dawson County
O'Donnell - Lynn County
Oak Hill - Travis County
Oakhurst - San Jacinto County
Oakland - Colorado County
Oakville - Live Oak County
Oakwood - Leon County
Ochiltree - Ochiltree County
Odem - San Patricio County
Odessa - Ector County
Oenaville - Bell County
Old Dime Box - Lee County
Oldenburg - Fayette County
Olive - Hardin County
Olmito - Cameron County
Omaha - Morris County
Onalaska - Polk County
Orange - Orange County
Orange Grove - Jim Wells County
Ore City - Upshur County
Osage - Coryell County
Ottine - Gonzales County
Otto - Falls County
Overton - Rusk County
Overton - Smith County
Oyster Creek - Brazoria County
Ozona - Crockett County