Why the code is HI
Hawaii is the rare state that had nothing to inherit. Print style guides never shortened it, the same way they never shortened Ohio, Iowa, Utah or Texas: the name was already short enough to set in a dateline. So when USPS issued the two-letter list in October 1963, so that a city, a state and the new ZIP code could share one line, Hawaii's entry was invented rather than copied.
The result was HI, the first letter plus the last one. HA would have been the more predictable pick, and it was available, because no other state begins with H. That makes Hawaii one of the few codes that collided with nothing at all.
Hawaii had been a state for four years by then, admitted in August 1959, so it appeared in the first printing of the list. Before statehood the islands were the Territory of Hawaii, and mail carried the older form: Honolulu, T.H.
Codes people confuse with HI
| Code | State | Why the mix-up happens |
|---|---|---|
| AK | Alaska | The two states outside the contiguous 48. Shipping tables, weather maps and delivery surcharges treat AK and HI as one bucket, so the pair gets swapped as a unit. |
| ID | Idaho | Hawaii sits directly above Idaho when a menu is sorted by state name. Both codes contain an I, so a mis-click survives a quick proofread. |
| IA | Iowa | Sort the same menu by code instead of name and HI lands immediately before IA, IL and IN, a four-line run where the eye slips. |
| PR | Puerto Rico | Both are Pacific or Caribbean island entries in the same dropdown, which is why people assume Hawaii is a territory rather than the 50th state. |
| HA | not a state | HA is the two-letter airline code for Hawaiian Airlines. Travellers copy it off a boarding pass into a state field. |
Quick facts about Hawaii
Capital: Honolulu
Largest city: Honolulu
Region: West, and the only state outside North America
Statehood: 1959, the 50th and most recent state
Population band: 1 to 5 million
Nickname: the Aloha State
Hawaii is one of 17 states where the capital is also the biggest city. It is the only state built entirely of islands, it ranks 43rd of 50 by area, and it keeps its own time zone without daylight saving, so the offset from the mainland changes twice a year. Roughly 2,400 miles of open Pacific separate Honolulu from the California coast. Hawaiian is an official state language alongside English, the result of the 1978 constitutional convention.
Where you will see HI
- Mail. Honolulu, HI, then a ZIP that always opens 967 or 968. No other state has a range that tight.
- License plates. Hawaii plates carry a rainbow and the words Aloha State, not the two-letter code. HI appears on the registration document.
- Shipping. The line that reads "excludes AK and HI" on free delivery offers is where most people meet the code, since ground freight has to cross an ocean.
- Sports. Hawaii has no team in the NFL, NBA, MLB or NHL, so HI almost never appears in a professional standings table. College scoreboards shorten the university to a three-letter tag instead.
- Crosswords. A two-letter answer of HI can be clued as the Aloha State abbreviation or as a greeting, which is why setters reach for it so often.
Fifty states, five minutes
Statedoku drops a new grid every morning built from codes, capitals and regions, Hawaii included.
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