| Seattle Logging Co. No. 2, Port Crescent, WA |
242 |
| Seattle Southeastern Railway No. 3, Selleck, WA |
437 |
| Seattle-Issaquah Electric Railway, Kennydale, WA |
904 |
| Sequim Bay Logging Co. No. 890, Blyn, WA |
890 |
| Silver Falls Logging Co., Mineral, WA |
1081 |
| Silver Lake Railway & Lumber Co. No. 1, Silver Lake, WA |
183 |
| Silver Lake Railway & Lumber Co. No. 2, Silver Lake, WA |
642 |
| Simpson Logging Co. No. 1, Shelton, WA |
239 |
| Simpson Logging Co. No. 2, Shelton, WA |
189 |
| Simpson Logging Co. No. 3 IRENE, Shelton, WA |
200 |
| Simpson Logging Co. No. 4 (2nd), Shelton, WA |
1279 |
| Simpson Logging Co. No. 4, Shelton, WA |
1589 |
| Simpson Logging Co. No. 7 (1st), Shelton, WA |
1371 |
| Simpson Mill Co., Elma, WA |
1365 |
| Skagit Logging Co., Sedro Woolley, WA |
636 |
| Skamania Logging Co., Greenleaf, WA |
980 |
| Skykomish Lumber Co. No. 1, Skykomish, WA |
692 |
| Smith, Kay, Brinnon, WA |
381 |
| Smith, Kay, Brinnon, WA |
964 |
| Snoqualmie Falls Lumber Co. No. 3, Snoqualmie Falls, WA |
1331 |
| Snow Creek Logging Co. No. 2, Blyn, WA |
1377 |
| Snow Creek Logging Co. No. 890, Blyn, WA |
890 |
| Snow Creek Logging Co., Blyn, WA |
1339 |
| Snow Creek Logging Co., Blyn, WA |
1499 |
| Sobey Manufacturing Co. No. 1, Granite Falls, WA |
X548 |
| Sobey Manufacturing Co. No. 2, Granite Falls, WA |
1005 |
| South Prairie Lumber Co. No. 2, South Prairie, WA |
734 |
| South Tacoma Mill Co., Tacoma, WA |
736 |
| Star Mill Co., Battleground, WA |
628 |
| Steams Logging Co., Carlisle, WA |
1019 |
| Stephens Brothers Inc. No. 1, Monroe, WA |
528 |
| Stephens-Bird Lumber & Logging Co., Monroe, WA |
734 |
| Sterling Mill Co. No. 351, Machais, WA |
351 |
| Stetson & Post Lumber Co. No. 2, Maple Valley, WA |
1527 |
| Stetson & Post Lumber Co., Maple Valley, WA |
407 |
| Stillwater Lumber Co. No. 754, Little Falls, WA |
754 |
| Stillwater Lumber Co., Little Falls, WA |
746 |
| Stimson Mill Co., Elma, WA |
X514 |
| Stonayer Lumber Co., Overlot, WA |
1017 |
| Stone & Webster Construction Co., WA |
284 |
| Storey-Keeler Lumber Co. No. 1, Cascades, WA |
249 |
| Sultan Lumber Co., Sultan, WA |
X355 |
| Sultan Railway & Timber Co. No. 1, Oso, WA |
894 |
| Superior Coal & Improvement Co. No. 1, Issaquah, WA |
1011 |
| Superior Portland Cement Co. No. 3, Concrete, WA |
1399 |
| Syverson & Hill, Littel, WA |
682 |
| Tenino Lumber Co. (Sidney/Burnett), Tenino, WA |
672 |
| Three Lakes Lumber Co. No. 1, Three Lakes, WA |
351 |
| Three Lakes Lumber Co. No. 2, Snohomish, WA |
1409 |
| Three Lakes Lumber Co. No. 2, Three Lakes, WA |
530 |
