The US has named Guam and Saipan in the Northern Marianas as major trans-shipment points in the international illegal drug trade.
The Saipan Tribune newspaper reports the US department as saying commercial air couriers and express mail services serve as the main means of shipment.
The report says shipments of the drug to Guam and to the United States are typically between one and four kilogrammes.
The State Department makes annual reports to Congress and describes the efforts of key countries to attack all aspects of the international drug trade in 2004.
It said that owing to high profit margins, Guam has emerged as a new market for methamphetamine made in China, which is known as "ice".