EXHIBIT 21 List of Subsidiaries of POGO PRODUCING COMPANY Jurisdiction of Name Incorporation 1. Thaipo Limited Kingdom of Thailand 2. Pogo Offshore Pipeline Co. Delaware 3. Pogo Gulf Coast, Ltd. Texas Limited Partnership (The Company is the general partner and a 40% limited partner) 4. Pogo Petroles Compagnie, Inc. Delaware 5. Pogo Netherlands, Inc. Delaware 6. Pogo Thailand, Inc. Delaware 7. Pogo Turkey Inc. Delaware 8. Sampack Inc. Delaware 9. Pogo British Isles, Inc. Delaware