EXHIBIT 21.1 SUBSIDIARIES OF THE COMPANY Tesoro Petroleum Corporation is publicly held and has no parent. The subsidiaries listed below are wholly-owned. Small or inactive subsidiaries are omitted from the list below. Such omitted subsidiaries, considered in the aggregate as a single subsidiary, would not constitute a "significant subsidiary" at the end of the year ended December 31, 2002. <Table> <Caption> INCORPORATED OR ORGANIZED Name of Subsidiary UNDER LAWS OF - ------------------ ------------- Tesoro Alaska Company ................................. Delaware Tesoro Hawaii Corporation ............................. Hawaii Tesoro Refining and Marketing Company ................. Delaware </Table>