Puako, HI -- U.S. Census Designated Place in Hawaii Population (2000): 429 Housing Units (2000): 702 Land area (2000): 10.309121 sq. miles (26.700499 sq. km) Water area (2000): 5.542386 sq. miles (14.354712 sq. km) Total area (2000): 15.851507 sq. miles (41.055211 sq. km) FIPS code: 65150 Located within: Hawaii (HI), FIPS 15 Location: 19.932025 N, 155.864837 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Puako, HI Puako