O
| No. | Town | Firms | Initials | Years | |
|---|---|---|---|---|---|
| New Haven, CT | Owen Equipment Manufacturing Company | O | 1902 - 1908 | Pic | |
| O | 1926 | Pic | |||
| Oklahoma City, OK | Oklahoma Stockyards National Bank | O (Shield) | 1917 - 1922 | Pic | |
| Providence, RI | Osborn & Barton | O&B | 1912 - 1926 | Pic | |
| O&/Co | Pic | ||||
| Cleveland, OH | Otis & Company | O&Co | 1917 - 1932 | Pic | |
| Richmond, VA | Owens & Minor Drug Company | O&M | 1908 - 1938 | Pic | |
| Dallas, TX | Olive & Meyers Manufacturing Company | O&M | 1933 - 1944 | Pic | |
| O&S | 1912 - 1918 | Pic | |||
| Chicago, IL | Chicago, St Paul, Minneapolis & Omaha Railway | O/RY. | 1902 - 1956 | Pic | |
| Portland, OR | Oregon Stamp Society | O/SS | Pic | ||
| Des Moines, IA | Otto Thumauer | O/T | 1908 - 1917 | Pic | |
| Chicago, IL | Office Appliance Company | OA | 1902 - 1908 | Pic | |
| Oklahoma City, OK | Oklahoma Agricultural College | OA | 1917 - 1933 | Pic | |
| New York, NY | Ocean Accident Insurance Company | OA | 1912 - 1918 | Pic | |
| Dallas, TX | OA/CO | 1914 - 1916 | Pic | ||
| New York, NY | Ovenstein, Arthur, Koppel Company | OAK | 1908 | Pic | |
| OB | 1926 - 1932 | Pic | |||
| Mansfield, OH | Ohio Brass Company | OB | 1908 - 1954 | Pic | |
| O'B | 1917 - 1922 | Pic | |||
| New York, NY | Orvis Brothers & Company | OB/&Co | 1912 - 1942 | Pic | |
| Des Moines, IA | O. B. West Wholesale Company | OB/W | 1912 - 1914 | Pic | |
| Saint Louis, MO | OB/W | 1908 - 1912 | Pic | ||
| Cleveland, OH | "Name on Stationery Company" | OBT | 1917 - 1940 | Pic | |
| OC/Co | 1912 - 1914 | Pic | |||
| New York, NY | O.C. Kanzow & Company | OCK | 1912 - 1914 | Pic | |
| OCK | 1908 - 1912 | Pic | |||
| OCP | 1926 | Pic | |||
| Milwaukee, WI | Oliver Chilled Plow Works | OCP | 1916 - 1942 | Pic | |
| New York, NY | Old Dominion Steamship Company | OD/SS | 1902 - 1922 | Pic | |
| OD/SS | 1922 | Pic | |||
| OD/SS | 1902 | Pic | |||
| OD/SS | Pic | ||||
| Norfolk, VA | Old Dominion Steamship Company | OD/SS | 1908 - 1914 | Pic | |
| ODT | 1917 | Pic | |||
| Philadelphia, PA | Otto Eisenlohr & Brothers | OE | 1908 - 1918 | Pic | |
| OE | 1912 | Pic | |||
| Lackawana, NY | Our Lady of Victory Infant Home | OE/CO | 1917 - 1922 | Pic | |
| New York, NY | O'Fallon Electrotype Company | O'F | 1926 - 1932 | Pic | |
| OFC | 1926 | Pic | |||
| Oklahoma City, OK | Oklahoma Farm Mortgage Company | OFM | 1922 | Pic | |
| New York, NY | Oscar Heyman & Company | OH/&Co | 1908 - 1914 | Pic | |
| Cleveland, OH | The Standard Oil Company of Ohio | OHIO | 1926 - 1960 | Pic | |
| Toledo, OH | The Standard Oil Company of Ohio | OHIO | 1902 - 1933 | Pic | |
| Cincinnati, OH | The Standard Oil Company of Ohio | OHIO | 1908 - 1932 | Pic | |
| Columbus, OH | The Standard Oil Company of Ohio | OHIO | 1908 - 1926 | Pic | |
| OHIO | 1912 | Pic | |||
| OI/Co | 1926 | Pic | |||
| Chicago, IL | Oil Insurance Agency | OIA | 1926 - 1944 | Pic | |
| Toledo, OH | Owens-Illinois Glass Company | OIG | 1931 - 1942 | Pic | |
| Duluth, MN | Oliver Iron Mining Company | OIM/Co | 1902 - 1963 | Pic | |
| New York, NY | The O.J. Gude Company | OJG | 1902 - 1908 | Pic | |
| OK | 1912 | Pic | |||
| OK (Circle) | 1908 - 1912 | Pic | |||
| New York, NY | "Truth" | OK/&/CO | 1917 - 1926 | Pic | |
| Chicago, IL | OKC | 1908 | Pic | ||
| Memphis, TN | O.K. Houck Piano Company | OKH | 1908 - 1912 | Pic | |
| OL | Pic | ||||
| Portland, OR | Oregon Life Insurance Company | OL | 1918 - 1926 | Pic | |
| Lackawanna, NY | Our Lady of Victory Infant Home | OLV | 1926 - 1940 | Pic | |
| Lansing, MI | Old Motor Works | OM/W | 1908 - 1933 | Pic | |
| Pontiac, MI | Oakland Motor Company | OMC | 1917 - 1954 | Pic | |
| Grand Rapids, MI | Oliver Machinery Company | OMC | 1917 - 1963 | Pic | |
| O'N | 1914 - 1917 | Pic | |||
| Omaha, NE | Omaha National Bank | ONB | 1902 - 1916 | Pic | |
| Cincinnati, OH | The Oskamp Nolting Company | ONCo | 1917 - 1922 | Pic | |
| Baltimore, MD | Sealpack Company | OO/&Co | 1908 - 1923 | Pic | |
| Niagara Falls, NY | Ontario Power Company | OP/Co | 1914 - 1917 | Pic | |
| Omaha, NE | Omaha Packing Company | OPC | 1908 - 1942 | Pic | |
| Omaha, NE | Omaha Paint Company | OPC | 1908 - 1914 | Pic | |
| Tulsa, OK | Oklahoma Pipe Line Company | OPL | 1926 - 1940 | Pic | |
| Cleveland, OH | Ohio Rubber Company | OR | 1908 | Pic | |
| OR | 1912 | Pic | |||
| Portland, OR | Oregon Railroad & Navigation Company | OR/&N | 1902 - 1908 | Pic | |
| Chicago, IL | Olson Rug Company | OR/C | 1918 - 1926 | Pic | |
| New York, NY | Ogus Rabivovich & Ogus Company | ORO | 1926 - 1965 | Pic | |
| Chicago, IL | Order of Railroad Telegraphers, Division #23 | ORT/23 | 1926 - 1954 | Pic | |
| Order of Railroad Telegraphers, Division #61 | ORT/61 | 1918 - 1923 | Pic | ||
| Webb City, OK | Osage Railroad Company | ORY | 1922 - 1926 | Pic | |
| Omaha, NE, Salt Lake City, UT | Oregon Short Line Railroad Company | OSL | 1902 - 1932 | Pic | |
| New York, NY | Ostermoor & Company | OST | 1908 - 1932 | Pic | |
| OSW | 1926 | Pic | |||
| Chicago, IL | The Oliver Typewriter Company | OTC | 1902 - 1912 | Pic | |
| OTC | 1912 - 1917 | Pic | |||
| Boston, MA | Old Colony Trust Company | OTC | 1902 - 1926 | Pic | |
| New York, NY | Otis Elevator Company | OTIS | 1902 - 1933 | Pic | |
| Chicago, IL | Otis Elevator Company | OTIS | 1908 - 1923 | Pic | |
| San Francisco, CA | Otis Elevator Company | OTIS | 1902 - 1918 | Pic | |
| New Orleans, LA | Otis Importing Company | OTIS | 1908 - 1932 | Pic | |
| OTJ | 1908 | Pic | |||
| New York, NY | Otto Thurnauer | OTO | 1902 - 1908 | Pic | |
| OTO | 1917 | Pic | |||
| Devils Lake, ND | Otter Tail Power Company | OTP | 1926 - 1963 | Pic | |
| Cleveland, OH | Ohio Varnish Company | OV | 1912 | Pic | |
| OV | 1914 | Pic | |||
| Denver, CO | OV | 1908 - 1917 | Pic | ||
| OV | 1902 - 1912 | Pic | |||
| Columbus, OH | State of Ohio, Department of State, Bureau of Vital Statistics | OVS | 1908 - 1914 | Pic | |
| New York, NY | New York, Ontario & Western Railroad | OW | 1917 - 1936 | Pic | |
| OW | 1908 | Pic | |||
| Brockton, MA | G.E. Keith Company | OW | 1902 - 1908 | Pic | |
| Portland, OR | Oregon-Washington Railroad & Navigation Co. | OW/RN | 1902 - 1936 | Pic | |
| OW/S | 1926 - 1938 | Pic | |||
| OW/T | 1912 | Pic | |||
| Chicago, IL | O.W. Richardson & Company | OWR | 1902 - 1922 | Pic | |
| Fort Worth, TX | OWS | 1918 - 1926 | Pic | ||
| Dallas, TX | Oil Well Supply Company | OWS/Co | 1926 - 1938 | Pic | |
| New York, NY | Oxford Press | OXF | 1908 - 1917 | Pic | |
| Chicago, IL | Otto Young | OY | 1902 - 1926 | Pic |
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Last update: 2015.09.27