EXHIBIT 21 KEYSTONE CONSOLIDATED INDUSTRIES, INC. AND SUBSIDIARIES SUBSIDIARIES OF THE REGISTRANT Jurisdiction of Percent of Incorporation Voting Securities Name of Corporation or Organization Held (1) Sherman Wire of Caldwell, Inc. Nevada 100.0% Fox Valley Steel and Wire Company Wisconsin 100.0% (formerly Wire Products Company) DeSoto, Inc. Delaware 100.0% J.L. Prescott Company New Jersey 100.0% DeSoto Environmental Management, Inc. Delaware 100.0% DeSoto Subsidiary Two Corporation New Jersey 100.0% (1) Held by the Registrant or the indicated subsidiary of the Registrant.