EX-21 4 0004.txt SUBSIDIARIES EXHIBIT 21 CROWN CASTLE INTERNATIONAL CORP. SUBSIDIARIES Crown Castle Operating Company (f/k/a Crown Castle USA Holdings Company), a Delaware corporation Crown Communication Inc., a Delaware corporation (d/b/a Crown Communications, CrownCom) Crown Castle USA Inc. (f/k/a Crown Network Systems, Inc.), a Pennsylvania corporation Crown Castle PT Inc., a Delaware corporation Crown Castle South Inc., a Delaware corporation Crown Castle GT Corp., a Delaware corporation Crown Castle GT Holding Company LLC, a Delaware limited liability company Crown Castle International LLC, a limited liability company Crown Castle Australia Holdings Pty Ltd., an Australian limited liability company Crown Castle Australia Pty Ltd. (f/k/a CCAL Towers Pty Ltd), an Australian limited liability company Crown Castle UK Holding Corp., a Delaware corporation Crown Castle UK Holdings Limited (f/k/a Castle Transmission Services (Holdings) Ltd.), an England and Wales company (unrestricted) Crown Castle UK Limited (f/k/a Castle Transmission International Ltd.), an England and Wales company Crown Castle do Brasil Ltda, a Brazilian limited liability company Crown Castle Investment Corp., a Delaware corporation (unrestricted) CCA Investment Corp., a Delaware corporation Crown Castle Atlantic Holding Company LLC, a Delaware limited liability company Crown Castle Investment Corp. II, a Delaware corporation (unrestricted)