Waipahu, HI is a city located in Honolulu County, Hawaii and has a land area of 19.26 square miles (49.88 km2). The water area for the city is 1.84 square miles or 4.77 km2. There is one unique zip code in Waipahu, Hawaii and it is 96797. The area code(s) for Waipahu is 808.
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