Kailua, HI is a city located in Honolulu County, Hawaii and has a land area of 21.73 square miles (56.28 km2). The water area for the city is 2.75 square miles or 7.12 km2. There is one unique zip code in Kailua, Hawaii and it is 96734. The area code(s) for Kailua is 808.
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