Kapolei Hawaii’s zip code is 96707. According to World Population Review there are over 21,674 residents living in Kapolei, HI. As we mentioned, it is one of the most sought after suburbs of Honolulu. It is also know for it’s hotter climate than most of the island. Kapolei is considered to be in the Ewa plain which covers a good amount of the leeward side of Oahu. Plain meaning no mountains. Flat, dry lands. There also used to be plantations throughout the plain. Now that sugar cane production has move overseas the plantations are gone and it consists of golf courses, shopping centers and newer developing communities.