I found the answer on wikipedia. Not sure if this is the zip code for the airport but this is the zip code for the islands. 6799
(see related question)
Australian area code 08 (international +61 8) serves WA, SA, and NT, plus the Cocos/Keeling Islands and Christmas Island. Numbers beginning 08 9 are in W.A., and 08 95 numbers are around Bullsbrook East.
The airport code for Brockville-Thousand Islands Regional Tackaberry Airport is XBR.
The Marshall Islands use country code +692.
There are two: the Cyril E. King Airport on St. Thomas (code: STT) and the Henry Rohlsen Airport on St. Croix (code: STX).
The airport code for Jammu Airport is IXJ.
The airport code for Shannon Airport is SNN.
The airport code for Miyako Airport is MMY.
The airport code for Zagreb Airport is ZAG.
Norfolk Island uses the telephone country code +672, which also serves Australian research bases in Antarctica. Country code +672 is usually listed as "Australian External Territories."The Cocos (Keeling) Islands and Christmas Island also previously used +672, but have now moved to codes within Australia's country code +61. Specifically, Cocos Islands are +61 8 9162, and Christmas Island is +61 8 9164.(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, and many other countries use different prefixes.)
The airport code for Gao International Airport is GAQ.
Honolulu, HI - Honolulu Airport (HNL).