Exhibit 21.1 SUBSIDIARIES OF RENTAL SERVICE CORPORATION RSC Holdings, Inc. (Delaware) RSC Acquisition Corp. (Delaware) Rental Service Corporation of Canada Ltd. (Alberta, Canada) Wholly owned subsidiaries of RSC Holdings, Inc.: RSC Industrial Corporation (Delaware) RSC Duval Inc. (Delaware) RSC Rents, Inc. (California) Wholly owned subsidiaries of RSC Acquisition Corp.: RSC Alabama, Inc. (Alabama) RSC Center, Inc. (Texas) Walker Jones Equipment, Inc. (Mississippi)