| San Leopold | Portland | OR |
| Santa Helena | Portland | OR |
| San Tome | Portland | OR |
| Schenectady | Portland | OR |
| Schenectody | Portland | OR |
| Scorpio | Portland | OR |
| Scotts Bluff | Portland | OR |
| Seafarer | Portland | OR |
| Sea Lord | Portland | OR |
| Seamerit | Portland | OR |
| Sears, Roebuck & Company | Salem | OR |
| Sea Thunder | Portland | OR |
| Seguado | Portland | OR |
| Senator | Portland | OR |
| Seneca | Portland | OR |
| Serenissima | Portland | OR |
| Seton Hall Victory | Portland | OR |
| Sevastopol | Portland | OR |
| Sewage Treatment Plant | Hood River | OR |
| Sewage Treatment Plant | Toledo | OR |
| S.E. Water & Clay Siding | Portland | OR |
| Sgt. Jack J. Pendleton | Portland | OR |
| Shapur | Portland | OR |
| Shasta Insulation | Portland | OR |
| Shawnee Trail | Portland | OR |
| Shell | Portland | OR |
| Shell | Deer Island | OR |
| Shell | Saint Helens | OR |
| Shepler Refrigeration | Portland | OR |
| Shipworth Juvenile Building | Eugene | OR |
| Shrine Hospital | Portland | OR |
| Shunyo | Portland | OR |
| Sidney Edgerton | Portland | OR |
| Silverbow Victory | Portland | OR |
| Silver Creek | Portland | OR |
| Silver Eagle Refining | Portland | OR |
| Silver Hawk | Portland | OR |
| Silver Hills | Portland | OR |
| Silver Peak | Portland | OR |
| Silver Robin | Portland | OR |
| Simeon G. Reed | Portland | OR |
| Simmons Victory | Portland | OR |
| Simon Benson | Portland | OR |
| Simon Bolivar | Portland | OR |
| Simpson Logging | Lyons | OR |
| Simpson Logging | Portland | OR |
| Simpson Paper | West Linn | OR |
| Sirip Khorramshahr | Portland | OR |
| Skagway Victory | Portland | OR |
| Skidmore Victory | Portland | OR |
