Palau is in Zone 1 of the U.S. Postal System, and U.S. domestic rates apply.
International mail is slightly higher. The post office is located on the main road in Koror, across from the Palau National Communications Corporation (PNCC) office. Palau’s stamps are favored by collectors worldwide. Palau’s zip code is 96940, except for the Palau National Capitol in Ngerulmud, Melekeok, which is 96939