P
| No. | Town | Firms | Initials | Years | |
|---|---|---|---|---|---|
| P | Pic | ||||
| Syracuse, NY | Prosperity Corporation | P | 1926 - 1938 | Pic | |
| P | 1908 - 1912 | Pic | |||
| P | 1908 - 1912 | Pic | |||
| Cheswick, PA | Steve Pavlina | P | Pic | ||
| Portland, OR | Pacific Paper Campany | P (Diamond) | 1908 - 1915 | Pic | |
| Boston, MA | P (Shield) | 1926 | Pic | ||
| P (Triangle) | 1908 | Pic | |||
| New York, NY | Passavant & Company | P&/Co | 1902 - 1918 | Pic | |
| Chicago, IL | Partridge & Anderson | P&A | 1916 - 1954 | Pic | |
| P&B | 1917 - 1918 | Pic | |||
| P&Co | 1936 | Pic | |||
| New York, NY | Post & Flagg | P&F | 1926 | Pic | |
| P&F | 1912 | Pic | |||
| New Britain, CT | P&F Corbin | P&F/C | 1902 - 1910 | Pic | |
| Cincinnati, OH | Proctor & Gamble | P&G | 1908 - 1914 | Pic | |
| New York, NY | Pratt & Lambert Incorporated | P&L | 1912 - 1938 | Pic | |
| Buffalo, NY | P&L | 1908 | Pic | ||
| Long Island City, NY | Pratt & Lambert Incorporated | P&L | 1926 - 1964 | Pic | |
| Minneapolis, MN | P&O | 1908 - 1917 | Pic | ||
| P&O | 1908 - 1912 | Pic | |||
| P&O | 1917 | Pic | |||
| New York, NY | Prentice & Slepack | P&S | 1926 | Pic | |
| New York, NY | Park & Tilford | P&T | 1922 - 1923 | Pic | |
| New York, NY | P&W | 1922 - 1926 | Pic | ||
| New York, NY | Prince & Whitely | P&W | 1922 - 1926 | Pic | |
| Chicago, IL | P./U.J. | 1914 - 1942 | Pic | ||
| Baltimore, MD | Parke, Davis & Company | P.D , P.D/Co | 1902 - 1940 | Pic | |
| Parke, Davis & Company | P.D./.Co. | 1912 | Pic | ||
| Parke, Davis & Company | P.D./Co. | Pic | |||
| New Orleans, LA | Parke, Davis & Company | P.D/.Co | 1908 - 1933 | Pic | |
| Saint Louis, MO | Parke, Davis & Company | P.D/.Co. | 1912 - 1942 | Pic | |
| Minneapolis, MN | Parke, Davis & Company | P.D/Co. | 1912 - 1938 | Pic | |
| P.G | Pic | ||||
| Jersey City, NJ | Palmolive Peet Company | P.PC | 1926 - 1938 | Pic | |
| Philadelphia, PA | Pennsylvania Sugar Company | P.S./Co. | 1926 - 1942 | Pic | |
| New York, NY | New York Department of Public Works | P.W./N.Y. | 1938 - 1958 | Pic | |
| San Francisco, CA | P/&Co | 1908 - 1917 | Pic | ||
| P/&Co | 1908 | Pic | |||
| Chicago, IL | Peter Cooper's Glue Factory | P/C | 1902 - 1908 | Pic | |
| New York, NY | Pynchon & Company | P/Co | 1922 | Pic | |
| Chicago, IL | The Pullman Company | P/Co | 1902 - 1942 | Pic | |
| Milwaukee, WI | Otto Pietsh Dye Works | P/DW | 1902 - 1923 | Pic | |
| Fresno, CA | Pacific Gas & Electric Company | P/GE | 1954 - 1963 | Pic | |
| San Francisco, CA | Pacific Gas & Electric Company | P/GE/Co | 1902 - 1963 | Pic | |
| Reading, PA | Pennsylvania Hardware Company | P/HDW | 1908 - 1922 | Pic | |
| P/INC | 1917 - 1922 | Pic | |||
| Philadelphia, PA | The Provident Life & Trust Company of Philadelphia | P/LT | 1908 - 1923 | Pic | |
| P/OB | 1912 | Pic | |||
| Buffalo, NY | Pierce Arrow Corporation | PA | 1914 - 1933 | Pic | |
| Boston, MA | Pettingill-Andrews Company | P-A | 1908 - 1912 | Pic | |
| New York, NY | Peter A. Frasse & Company, Incorporated | PAF | 1926 - 1940 | Pic | |
| Concord, NH | Page Belting Company | PAGE | 1908 - 1912 | Pic | |
| New York, NY | Park Avenue Hotel | PAH | 1914 | Pic | |
| New York, NY | Preferred Accident Insurance Company | PAI/Co | 1908 - 1940 | Pic | |
| New Orleans, LA | Pan-American Life Insurance Company | PAL/IC | 1908 - 1938 | Pic | |
| New Orleans, LA | Pan-American Petroleum Company | PAP/Co | 1926 - 1938 | Pic | |
| New York, NY | Paul Block and Associates | PB | 1918 - 1951 | Pic | |
| Chicago, IL | Pickanos Brothers & Company | PB | 1908 - 1926 | Pic | |
| PB/&Co | 1908 - 1914 | Pic | |||
| New York, NY | Realty Associates Management Corporation | PB/331 | 1930 - 1933 | Pic | |
| New York, NY | Peierls Buhler & Company | PB/C | 1902 - 1918 | Pic | |
| PB/C | 1917 - 1918 | Pic | |||
| PB/Co | 1926 | Pic | |||
| New York, NY | Presbyterian Board of Publications | PBP | 1902 - 1917 | Pic | |
| Syracuse, NY | Pierce, Butler & Pierce Manufacturing Company | PBP | 1908 - 1942 | Pic | |
| PBP | 1908 - 1912 | Pic | |||
| Newark, NJ | Colgate Palmolive Company | PC | 1938 - 1954 | Pic | |
| PC | 1914 - 1922 | Pic | |||
| New York, NY | Penington, Colket & Wisner | PC/&W | 1938 | Pic | |
| Chicago, IL | Portland Cement Association | PC/A | 1912 - 1963 | Pic | |
| Battle Creek, MI | Postum Cereal Company, Limited | PC/Co | 1902 - 1942 | Pic | |
| Saint Paul, MN | Phoenix Chair Company | PC/Co | 1912 - 1926 | Pic | |
| PC/Co | 1912 - 1914 | Pic | |||
| Pittsburgh, PA | Pittsburgh Coal Company | PC/Co | 1908 - 1942 | Pic | |
| New York, NY | Post Products Company, Incorporated | PC/Co | 1917 - 1933 | Pic | |
| Seattle, WA | Pacific Coast Coal Company | PC/CO | 1917 - 1942 | Pic | |
| New York, NY | Pepsi-Cola Company | PC/Co | 1938 - 1952 | Pic | |
| New York, NY | Peter Coopers Glue Factory | PC/Co | 1908 | Pic | |
| Minneapolis, MN | Pittsburgh Coal Company | PC/Co. | 1912 - 1942 | Pic | |
| Chicago, IL | Pullman-Standard Car Manufacturing Company | PC/MC | 1922 - 1952 | Pic | |
| PC/SW | 1902 | Pic | |||
| Chicago, IL | Physicians Co-op Association | PCA | 1908 - 1916 | Pic | |
| PCB | 1926 | Pic | |||
| New York, NY | New York-Pacific Commercial Company | PCC | 1908 - 1917 | Pic | |
| New York, NY | Anderson Meyer & Company | PCC | 1917 - 1918 | Pic | |
| Chicago, IL | PCC | 1917 - 1918 | Pic | ||
| PCC | 1908 | Pic | |||
| Chicago, IL | PCC | 1908 | Pic | ||
| Saint Paul, MN | The Pullman Company | PCL | 1917 - 1922 | Pic | |
| Chicago, IL | Peruna Company | PCo | 1908 - 1923 | Pic | |
| Pittsburgh, PA | Philadelphia Company | PCo | 1902 - 1908 | Pic | |
| Pittsburgh, PA | Crucible Steel Company of America | PCS | 1912 - 1942 | Pic | |
| PD | 1908 | Pic | |||
| San Francisco, CA | Parke, Davis & Company | PD | 1923 - 1942 | Pic | |
| Denver, CO | Parke, Davis & Company | PD | 1926 - 1940 | Pic | |
| Boston, MA | Parke, Davis & Company | PD | 1917 - 1938 | Pic | |
| Indianapolis, IN | Parke, Davis & Company | PD | 1926 - 1938 | Pic | |
| Atlanta, GA | Parke, Davis & Company | PD | 1923 - 1942 | Pic | |
| Dallas, TX | Parke, Davis & Company | PD | 1926 - 1938 | Pic | |
| Pittsburgh, PA | Parke, Davis & Company | PD | 1917 - 1938 | Pic | |
| Cincinnati, OH | Parke, Davis & Company | PD | 1918 - 1938 | Pic | |
| Philadelphia, PA | Parke, Davis & Company | PD , P.D. | 1926 - 1942 | Pic | |
| Detroit, MI | Parke, Davis & Company | PD , P.D./Co. | 1902 - 1933 | Pic | |
| Buffalo, NY | Parke, Davis & Company | PD , PD/.Co | 1926 - 1938 | Pic | |
| Seattle, WA | Parke, Davis & Company | PD./Co | 1908 - 1940 | Pic | |
| Kansas City, MO | Parke, Davis & Company | PD/.Co. | 1908 - 1938 | Pic | |
| Chicago, IL | Parke, Davis & Company | PD/Co | 1908 - 1942 | Pic | |
| New York, NY | Parke, Davis & Company | PD/Co. | 1902 - 1938 | Pic | |
| Albany, NY | New York State Police | PD/NY | 1908 | Pic | |
| Lafayette, IN | Brotherhood of Painters, Decorators and Paperhangers of America | PD/P | 1914 - 1922 | Pic | |
| Harrisburg, PA | Pennsylvania, Department of Revenue | PD/R | 1938 - 1975 | Pic | |
| Pittsburgh, PA | Pittsburgh Drygoods Company | PDG | 1908 - 1918 | Pic | |
| Harrisburg, PA | Pennsylvania Department of Highways | PDH | 1922 - 1954 | Pic | |
| Des Moines, IA | Pittsburgh-Des Moines Steel Company | PDM | 1926 - 1954 | Pic | |
| Harrisburg, PA | PDR | 1938 | Pic | ||
| Harrisburg, PA | Pennsylvania Department of Revenue | PDR | 1926 - 1954 | Pic | |
| PE | 1912 | Pic | |||
| New York, NY | Pathe Exchange | PE | 1914 - 1926 | Pic | |
| Los Angeles, CA | Pacific Electric Railway | PE | 1908 - 1923 | Pic | |
| Los Angeles, CA | Pacific Electric Railway Company | PE | 1923 - 1954 | Pic | |
| Portland, OR | Portland, Eugene & Eastern Railway | PE&/ERY | 1908 - 1912 | Pic | |
| Buffalo, NY | Robertson Cataract Electric Company | PE/Co | 1908 - 1926 | Pic | |
| PE/Co | 1908 | Pic | |||
| Kansas City, MO | Peet Brothers | PEET | 1908 - 1914 | Pic | |
| Pittsburgh, PA | Pittsburgh Equitable Meter Company | PEM/Co | 1931 - 1942 | Pic | |
| Jersey City, NJ | S.B. Penick & Company, Incorporated | PEN/ICK | 1922 - 1948 | Pic | |
| Kansas City, MO | J.C. Peppard Seed Company | PEP/PARD | 1908 - 1922 | Pic | |
| PES | 1908 - 1912 | Pic | |||
| PES | 1912 | Pic | |||
| PES | 1926 - 1933 | Pic | |||
| Newark, NJ | Pavey Envelope & Tag Company | PET/Co. | 1938 - 1952 | Pic | |
| Southington, CT | Peck, Stowe & Wilcox Company | PEXTO | 1914 - 1942 | Pic | |
| New York, NY | PF | 1917 - 1926 | Pic | ||
| Chicago, IL | Dr. Peter Fahmey & Sons Company | PF | 1912 | Pic | |
| San Francisco, CA | Pacific Fruit Exchange | PF | 1908 - 1926 | Pic | |
| Philadelphia, PA | Pratt Food Company | PF | 1908 - 1914 | Pic | |
| Long Beach, CA | The Perfins Club | PF | Pic | ||
| The Perfins Club - President | PF | Pic | |||
| The Perfins Club - Vice President | PF | Pic | |||
| The Perfins Club - Secretary | PF | Pic | |||
| The Perfins Club-Treasurer | PF | Pic | |||
| PF/C | 1902 - 1908 | Pic | |||
| Houston, TX | Pierce Fordyce Oil Corporation | PF/OA | 1908 - 1922 | Pic | |
| Raleigh, NC | The Progressive Farmer | PFC | 1914 - 1918 | Pic | |
| PFC | 1914 | Pic | |||
| Philadelphia, PA | Pennsylvania Fire Insurance Company | PFI | 1926 - 1933 | Pic | |
| New Orleans, LA | Peter F. Pescud | PFP | 1908 - 1917 | Pic | |
| Milwaukee, WI | PG | 1908 - 1917 | Pic | ||
| PG | 1914 - 1917 | Pic | |||
| Milwaukee, WI | Phillip Gross Hardware Company | PG | 1912 | Pic | |
| Cincinnati, OH | PG | 1912 | Pic | ||
| PG/&/Co | Pic | ||||
| San Francisco, CA | Parker Grocery Company | PG/C | 1908 - 1917 | Pic | |
| PG/C. | 1914 - 1917 | Pic | |||
| Chicago, IL | The Peoples Gas Light & Coke Company | PG/Co | 1902 - 1908 | Pic | |
| PGC | 1908 | Pic | |||
| Harrisburg, PA | Pennsylvania Game Commission | PGC | 1938 - 1954 | Pic | |
| PGH | 1917 | Pic | |||
| PGH | 1917 | Pic | |||
| PGK | 1908 - 1912 | Pic | |||
| Denver, CO | B.F. Goodrich Company | PGR | 1926 - 1940 | Pic | |
| Portland, OR | PGR | 1922 - 1933 | Pic | ||
| Salt Lake City, UT | PGR | 1926 - 1930 | Pic | ||
| New York, NY | Peter Henderson & Company | PH | 1902 - 1917 | Pic | |
| PH | 1917 - 1932 | Pic | |||
| PH | 1922 - 1933 | Pic | |||
| New York, NY | Peter Henderson & Company | PH | 1912 - 1917 | Pic | |
| Philadelphia, PA | The Philadelphia Inquirer | PH./INQ | 1917 - 1932 | Pic | |
| Chicago, IL | Peabody Houghteling & Company | PH/&Co | 1902 - 1914 | Pic | |
| Boston, MA | Parker Holmes Company | PH/C | 1908 - 1918 | Pic | |
| Chicago, IL | Paul H. Davis & Company | PHD/&Co | Pic | ||
| Brooklyn, NY | Phenix Insurance Company | PHE/NIX | 1908 - 1912 | Pic | |
| Detroit, MI | Penberthy Injector Company | PI/CO | 1902 - 1917 | Pic | |
| Hartford, CT | Phoenix Insurance Company | PIC (Circle) | 1902 - 1914 | Pic | |
| Cincinnati, OH | Phoenix Insurance Company | PIC (Circle) | 1908 - 1938 | Pic | |
| Chicago, IL | Albert Pick & Company | PICK | 1902 - 1917 | Pic | |
| Sharon, PA | PIW | 1926 | Pic | ||
| New York, NY | Phillips-Jones Corporation | PJ | 1917 - 1926 | Pic | |
| Minneapolis, MN | Piper Jeffrey & Hopewood | PJ/&H | 1931 - 1938 | Pic | |
| New York, NY | Phillips-Jones Company, Incorporated | P-J/Co | 1912 - 1923 | Pic | |
| Peoria, IL | Peoria Journal Transcript | PJT | 1938 - 1963 | Pic | |
| Pittsburgh, PA | Pennsylvania Lines-West | PL | 1914 - 1922 | Pic | |
| PL | 1914 - 1916 | Pic | |||
| Los Angeles, CA | Pacific Light & Power Company | PL/&PC | 1908 - 1914 | Pic | |
| Pittsburgh, PA | Pittsburgh Life & Trust Company | PL/&T | 1908 - 1914 | Pic | |
| San Francisco, CA | Pacific Lighting Corporation | PL/Co | 1936 - 1938 | Pic | |
| Philadelphia, PA | Public Ledger - Philadelphia Inquirer | PL/CO | 1912 - 1933 | Pic | |
| New York, NY | P. Lorillard Company Incorporated | PLC | 1908 - 1922 | Pic | |
| PLC | 1912 | Pic | |||
| Boston, MA | Pierre Lorillard Company | PLC | 1926 - 1954 | Pic | |
| Chicago, IL | Peerless Light Company | PLC | 1917 - 1923 | Pic | |
| PLC | 1908 | Pic | |||
| PLCo | Pic | ||||
| Philadelphia, PA | Pennsylvania Labor Department | PLD | 1926 - 1940 | Pic | |
| Pittsburgh, PA | The Pittsburgh & Lake Erie Railroad Company | PLE | 1917 - 1970 | Pic | |
| Philadelphia, PA | PLM | 1938 - 1942 | Pic | ||
| Philadelphia, PA | Pennsylvania Mutual Lumbermens Insurance Co. | PLM | 1931 - 1954 | Pic | |
| New York, NY | Pacific Mills | PM | 1926 - 1938 | Pic | |
| Chicago, IL | Popular Mechanics | PM | 1908 - 1933 | Pic | |
| Detroit, MI | Pere Marquette Railway Company | PM | 1908 - 1954 | Pic | |
| New York, NY | Partola Manufacturing Company | PM/C | 1914 - 1919 | Pic | |
| PM/C | 1908 - 1917 | Pic | |||
| Los Angeles, CA | The Pacific Mutual Life Insurance Company | PM/LIFE | 1914 - 1954 | Pic | |
| Washington, DC | Postmasters Advocate Publishing Company | PMA | 1902 - 1908 | Pic | |
| PMC | 1917 | Pic | |||
| Chicago, IL | PMC | 1902 - 1912 | Pic | ||
| PMC | 1908 | Pic | |||
| New York, NY | Plaza Music Company | PMC | 1923 - 1926 | Pic | |
| Detroit, MI | Packard Motor Car Company | PMC/Co | 1902 - 1938 | Pic | |
| Boston, MA | The Puffer Manufacturing Company | PMC/Co | 1908 - 1926 | Pic | |
| Detroit, MI | Puritan Machinery Company | PMC/Co | 1912 - 1914 | Pic | |
| Shortsville, NY | Paper Machine Company | PMC/Co | 1926 - 1938 | Pic | |
| Chicago, IL | Paper Mills | PMC/Co | 1902 - 1922 | Pic | |
| Hartford, CT | Pennsylvania Mutual Life Insurance Company | PML | 1917 - 1931 | Pic | |
| New York, NY | PN | 1926 - 1938 | Pic | ||
| New York, NY | RKO Pathe, Incorporated | PN | 1938 - 1950 | Pic | |
| Philadelphia, PA | PNB | 1912 - 1914 | Pic | ||
| Philadelphia, PA | The Philadelphia National Bank | PNB , P/NB | 1902 - 1942 | Pic | |
| Pittsburgh, PA | Peoples Natural Gas Company | PNG | 1912 - 1933 | Pic | |
| PNG | 1917 | Pic | |||
| PNG | 1917 - 1938 | Pic | |||
| Pittsburgh, PA | Hope Natural Gas Company | PNG | 1926 - 1965 | Pic | |
| Pinehurst, NC | Pinehurst Outlook | PO | 1908 - 1912 | Pic | |
| Independence, KS | PO/&G | 1922 | Pic | ||
| Cleveland, OH | PO/Co | 1926 | Pic | ||
| San Francisco, CA | Associated Oil Company | PO/Co | 1919 - 1922 | Pic | |
| Cleveland, OH | Phoenix Oil Company | PO/CO , PO/Co | 1917 - 1926 | Pic | |
| Detroit, MI | People's Outfitting Company | POC | 1902 - 1914 | Pic | |
| Saint Louis, MO | Pierce Oil Company | POC | 1914 - 1918 | Pic | |
| POC | 1908 | Pic | |||
| Milwaukee, WI | POC | 1926 - 1931 | Pic | ||
| New York, NY | Pierce Oil Company | POC | 1917 | Pic | |
| POC | 1917 | Pic | |||
| New York, NY | Pacific Oil Company | POC | 1922 | Pic | |
| Cleveland, OH | Penton Publishing Company | PP | 1914 - 1918 | Pic | |
| PP | 1914 - 1917 | Pic | |||
| Tacoma, WA | ...ns Press | PP | 1912 | Pic | |
| Boston, MA | The Pilgrim Press | PP | 1908 - 1918 | Pic | |
| PP | 1918 | Pic | |||
| PP | 1908 | Pic | |||
| Springfield, MA | Phelps Publishing Company | PP | 1908 - 1918 | Pic | |
| PP | 1917 - 1922 | Pic | |||
| Chicago, IL | Percival B. Palmer Company | PP | 1908 - 1918 | Pic | |
| PP | 1912 - 1918 | Pic | |||
| Berkeley, CA | Palmolive Peet Company | PP.C | 1926 - 1954 | Pic | |
| New York, NY | Paramount Pictures Corporation | PP/C | 1918 - 1954 | Pic | |
| Reading, PA | PP/Co | 1926 - 1938 | Pic | ||
| Newark, NJ | Palmer Price Company | PP/Co | 1908 - 1912 | Pic | |
| Milwaukee, WI | Pitcairn Varnish Company | PP/Co | 1902 - 1917 | Pic | |
| PP/Co | 1902 | Pic | |||
| Cleveland, OH | Penton Publshing Company | PP/Co | 1914 - 1981 | Pic | |
| PPC | 1931 - 1938 | Pic | |||
| Janesville, WI | The Parker Pen Company | PPC | 1902 - 1973 | Pic | |
| Chicago, IL | Palmolive Peet Company | PPC | 1926 - 1933 | Pic | |
| New York, NY | Pease Piano Company | PPC | 1908 - 1912 | Pic | |
| Milwaukee, WI | Plankington Packing Company | PPC | 1908 - 1940 | Pic | |
| Kansas City, MO | Palmolive Peet Company | PPC. | 1926 - 1940 | Pic | |
| Pittsburgh, PA | PPG | 1926 - 1932 | Pic | ||
| San Francisco, CA | Panama-Pacific International Exposition Company | PPI/ECo | 1908 - 1914 | Pic | |
| Bowie, TX | PPL | 1917 - 1926 | Pic | ||
| Pullman Railroad | PR | 1908 - 1912 | Pic | ||
| San Francisco, CA | Paul Rieger & Company | PR (Square) | 1908 - 1912 | Pic | |
| Muskegon, MI | PR/CO | 1917 - 1926 | Pic | ||
| Portland, OR | Portland Railway Light & Power Company | PR/LP | 1908 - 1918 | Pic | |
| PRG/Co | 1908 - 1912 | Pic | |||
| Philadelphia, PA | The Pennsylvania Railroad Company | PRR , PRR/Co | 1902 - 1958 | Pic | |
| Chicago, IL | Puget Sound Division, Chicago, Milwaukee, Saint Paul & Pacific Railroad | PS | 1914 - 1963 | Pic | |
| Boston, MA | Christian Science Publishing Company | PS | 1908 - 1912 | Pic | |
| The Perfin Society of Great Britain | PS | Pic | |||
| Brooklyn, NY | Public Service Cup Company | PS/CCo | 1917 - 1923 | Pic | |
| Brooklyn, NY | PS/CCo | 1917 | Pic | ||
| Philadelphia, PA | The Pennsylvania Steel Company | PS/Co | 1902 - 1916 | Pic | |
| PS/Co | 1908 - 1926 | Pic | |||
| PS/Co | 1952 - 1954 | Pic | |||
| Pittsburgh, PA | Pittsburgh Steel Company | PS/Co | 1902 - 1922 | Pic | |
| Joliet, IL | Public Service Company of Northern Illinois | PS/Co , PS./Co , P.S/Co , PS/Co. | 1908 - 1963 | Pic | |
| Steelton, PA | The Pennsylvania Steel Company | PSC | 1908 - 1916 | Pic | |
| Pittsburgh, PA | Pressed Steel Car Company, Incorporated | PSC | 1926 - 1948 | Pic | |
| Jefferson City, MO | Public Service Commission | PSC | 1938 - 1965 | Pic | |
| Harrisburg, PA | Pennsylvania State College | PSC | 1926 - 1932 | Pic | |
| Harrisburg, PA | The Public Service Commission of the Commonwealth of Pennsylvania | PSC | 1914 - 1926 | Pic | |
| PSC | 1938 - 1944 | Pic | |||
| New York, NY | Platt Printing & Supply Company, Incorporated | PSC | 1926 - 1942 | Pic | |
| New York, NY | Power Specialty Company | PSCo | 1914 - 1933 | Pic | |
| Panhandle and Santa Fe Railway Company | PSF | 1926 - 1964 | Pic | ||
| New York, NY | Provident Savings Life Assurance Society of N. Y. | PSL | 1908 - 1933 | Pic | |
| Seattle, WA | Puget Sound National Bank | PSN | 1908 - 1909 | Pic | |
| New York, NY | Pacific Steam Navigation Company | PSN | 1926 | Pic | |
| New York, NY | Parsons Trading Company | PTC | 1908 - 1917 | Pic | |
| Oklahoma City, OK | Pioneer Telephone & Telegraph Company | PTT | 1912 - 1954 | Pic | |
| PU/SEC | 1902 - 1912 | Pic | |||
| Harrisburg, PA | Pennsylvania Utility Commission | PUC | 1938 - 1988 | Pic | |
| PVL/CO | 1917 | Pic | |||
| Chicago, IL | Paine-Webber & Company | PW | 1926 - 1933 | Pic | |
| San Francisco, CA | C.A. Calvin, Manager, 238-240 Bush Street | PW | 1923 - 1932 | Pic | |
| Buffalo, NY | PW | 1912 - 1914 | Pic | ||
| New York, NY | Paine-Webber & Company | PW/&CO , PW/Co | 1917 - 1938 | Pic | |
| Boston, MA | Paine-Webber & Company | PW/&Co | 1917 - 1926 | Pic | |
| Pittsburgh, PA | Pennsylvania Water Company | PW/Co | 1908 - 1988 | Pic | |
| New York, NY | Paine, Webber, Jackson & Curtis | PW/J&C | Pic | ||
| Philadelphia, PA | Peter Well & Sons Manufacturing Company | PW/S | 1912 - 1917 | Pic | |
| PWB | 1932 | Pic | |||
| Adrian, MI | Peerless Wire Fence Company | PWF | 1908 - 1917 | Pic | |
| Pittsburgh, PA | PWH | 1926 - 1938 | Pic | ||
| Pittsburgh, PA | Pittsburgh Water Heater | PWH/Co | 1902 - 1917 | Pic | |
| Philadelphia, PA | Pennsylvania Indemnity Corporations | PXI | 1926 - 1936 | Pic | |
| Richmond, VA | Southern Packing & Provision Company | P-Y/Co | 1912 | Pic |
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Last update: 2016.11.07