According to the United States Postal Service, parcels shipped to Guam (Zip Code: 96910) are considered domestic mail. A Priority Mail package will take 3 days from Washington DC to Guam at a cost of $4.95. Depending upon your location, these details may be slightly different.

Priority Mail is used for documents, gifts, merchandise, and any mailable item weighing 70 pounds or less. The maximum size is 108 inches or less in combined length and distance around the thickest part. Mark each package "Priority Mail" in the postage area or use a USPS-provided Priority Mail envelope or box.

Features
Priority Mail service offers two- to three-day service to most domestic destinations. Priority Mail envelopes and boxes are available at many Post Offices and can be ordered online at The Postal Store. You can print Priority Mail labels and postage with Click-N-Ship and receive lower prices.

Priority Mail "Balloon Price"
Parcels that are addressed for delivery to zones 1-4 (including local) and weigh less than 20 pounds but measure more than 84 inches in combined length and distance around the thickest part must pay the 20-pound Priority Mail zoned price.

Priority Mail "Dimensional Weight"
Parcels addressed for delivery to zones 5–8 that exceed 1 cubic foot (1,728 cubic inches) are charged based on the actual weight or the dimensional weight, whichever is greater.
Source(s):
http://www.usps.com/

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