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HI The standard two letter abbreviation for the state of Hawaii is HI.
US State: Abbreviation: Alabama: AL: Alaska: AK: Arizona: AZ: Arkansas: AR: California: CA: Colorado: CO: Connecticut: CT: Delaware: DE: Florida: FL: Georgia: GA: Hawaii: HI: Idaho: ID: Illinois: IL: Indiana: IN: Iowa: IA: Kansas: KS: Kentucky: KY: Louisiana: LA: Maine: ME: Maryland: MD: Massachusetts: MA: Michigan: MI: Minnesota: MN: Mississippi: MS: Missouri: MO: Montana: MT: Nebraska: NE: Nevada: NV: New Hampshire: NH: New Jersey: NJ: New Mexico: NM: New York: NY