Creator
- Ohio Bell Telephone Company.1
- Oklahoma Card Co. (Oklahoma City, Okla.)1
- Old Sailor, 1790-1846.3
- Oldham, Williamson Simpson, 1813-1868.2
- Oliphant, Mrs. (Margaret), 1828-1897.1
- Oliver Ditson Company.4
- Oliver, Paul.1
- Olivers, Thomas, 1725-1799.1
- Olmstead, Charles H.2
- Omdha, Laucasta.1
- One who loves him in Georgia.1
- Oppenheim, E. Phillips (Edward Phillips), 1866-1946.1
- Orange News Co.1
- Orcajo Photo Art (Dayton, Ohio)2
- Oregon Pharmacy (Greenwood, S.C.)1
- Organ W. H.7
- Original Fowler Studio (Philadelphia, Pa.)1
- Orr, Edgar2
- Orr, J. L. (James Lawrence), 1822-18731
- Orr, Stephens1