Eighteen organizations, as listed earlier, sent representatives to the first meeting of the Council in 1945. More than half of these organizations still participate (in some instances under a new name that has resulted from reorganization). In recent years engineering firms have been added as participants, each naming one representative member to the council. There are now (1981) 33 sponsoring/participating organizations and 43 participating firms, as noted in Table 2.
| American Institute of Steel Construction | Aluminum Association | Amirikian Engineering Co. |
| American Iron and Steel Institute | American Institute of Architects | Emmann & Whitney |
| American Petroleum Institute | American Society of Civil Engineers | Beiswenger, Hoch & Assoc. |
| Brown & Root, Inc. | American Society of Mechanical Engineers | Martin Berkowitz Assoc. |
| Canadian Institute of Steel Construction | Canadian Society for Civil Engineering | Blauvelt Engineering Co. |
| Chevron U.S.A., Inc. | Corps of Engineers United States Army | Carruthers and Wallace, Ltd. |
| Chicago Bridge & Iron Co. | Earthquake Engineering Research Institute | Copperweld Tubing Group |
| Earl & Wright | Engineering Foundation | De Leuw Cather & Co. |
| McDermott Inc. | European Convention for Constructional Steelwork | Devlon Hampton & Assoc. |
| Metal Building Manufacturers Association | Federal Highway Administration | Dravo Van Houten, Inc. |
| Mobil Research & Development Corp. | General Services Administration | Edwards & Kelcey, Inc. |
| National Science Foundation | Institute of Engineers, Australia | Feld, Kaminetzky & Cohen, P.C. |
| Shell Oil Co. | International Conference of Building Officials | Gannett Fleming Corddry and Carpenter, Inc. |
| | Langley Research Center, NASA | Gilbert Associates, Inc. |
| | National Bureau of Standards | Green International, Inc. |
| | Naval Facilities Engineering Command, United States Navy | Hardesty & Hanover |
| | Naval Ship Research & Development Center, United States Navy | Hazelet & Erdal |
| | Steel Joist Institute | Howard Needles Tammen & Bergendoff |
| | Structural Engineers Association of California | Iffland, Kavanagh, Watherbury, P.C. |
| | Welding Research Council | Bernard Johnson, Inc. |
| | | LeMessurier Associates/SCI |
| | | Lev Zetlin Associates, Inc. |
| | | A. G. Lichtenstein & Associates, Inc. |
| | | Lockwood, Andrews & Newman, Inc. |
| | | Loomis and Loomis, Inc. |
| | | Charles T. Main, Inc. |
| | | Modjeski and Masters |
| | | Walter P. Moore & Associates, Inc. |
| | | Parsons Brinkerhoff ,Quade and Douglas, Inc. |
| | | Richardson, Gordon and Associates |
| | | Rummel, Klepper & Khal |
| | | Sargent & Lundy |
| | | Seelye, Stevenson, Value & Knecht, Inc. |
| | | Skidmore, Owings & Merrill |
| | | Skilling, Helle, Christiansen, Robertson, P.C. |
| | | Steinman, Boynton, Gronquist & Birdsall |
| | | Sverdrup & Parcel and Associates, Inc. |
| | | Tippetts-Abbett-McCarthy-Stratton |
| | | URS/John A. Blume & Associates, Engineers |
| | | URS/ Madigan-Praeger, Inc. |
| | | Vollmer Associates, Inc. |
| | | Weiskopf & Pickworth |
| | | Wiss, Janney, Elstner and Associates, Inc. |
