EXHIBIT 21.1 SUBSIDIARIES OF THE REGISTRANT (EACH OF WHICH IS WHOLLY OWNED BY THE REGISTRANT) 1. Rhinelander Paper Company, Inc., a Wisconsin corporation 2. Wausau Papers Export Corporation, a Wisconsin corporation 3. Wausau Papers International, Inc., a U.S. Virgin Islands corporation 4. Wausau Papers of New Hampshire, Inc., a Delaware corporation 5. Wausau Papers Otis Mill Inc., a Delaware corporation 6. WPM Holdings, Inc., a Wisconsin corporation -1-