- Ohio River Railroad Company.2
- Ohio River Valley Water Sanitation Commission.8
- Ohio School of the Air.1
- Ohio State Archaeological and Historical Society.1
- Ohio Valley Academy of Dentistry.2
- Ohio Valley Board of Trade (Wheeling, W. Va.)2
- Ohio Valley College (Parkersburg, W. Va.)5
- Ohio Valley Environmental Coalition (Huntington, W. Va.)2
- Ohio Valley Historical Association.3
- Ohio Valley Industrial Corporation (Wheeling, W. Va.)2
- Ohio Valley Industrial and Business Development Corporation (Wheeling, W. Va.)1
- Ohio Valley Oil, Gas and Mineral Company.1
- Ohio Valley Protective Union (Wheeling, W. Va.)1
- Ohio Valley Sociological Society.1
- Ohio-West Virginia YMCA (St. George, W. Va.)1
- Ohio. Department of Natural Resources. Division of Parks and Recreation.2
- Old Greenbrier Baptist Church (Alderson, W. Va.)1
- Old Marlinton Hotel (Marlinton, W. Va.)1
- Old Morgantown Glass Collectors' Guild (Morgantown, W. Va.)1
- Old National Bank (Martinsburg, W. Va.)1
