Bank of Hawaii Routing Number: Banking 2,400 Miles From the Mainland

The challenge of banking in the most isolated state

Hawaii is 2,400 miles from the nearest US mainland — farther from the continental United States than any other state. That geographic isolation shapes everything about Hawaiian banking, from the cost structure of physical branch operations to the logistics of check clearing and cash transport. Bank of Hawaii was founded in 1897, before Hawaii was even a US territory, and remains the largest independent bank headquartered in the state with roughly $24 billion in assets.

The routing number 121301028 begins with 121 — the prefix for the Federal Reserve Bank of San Francisco, which processes transactions for all Hawaiian financial institutions. Because there is no Federal Reserve branch in Hawaii, all interbank settlement happens across 2,400 miles of Pacific Ocean, a logistical reality that once added days to check clearing times and still affects the operational cost of cash distribution across the islands.

Routing number

121301028 covers all Bank of Hawaii accounts regardless of which island or Pacific territory the account was opened in. ACH transfers, direct deposits, bill pay, and domestic wire transfers all use this single number. For military direct deposit through DFAS, service members use 121301028 and their Bank of Hawaii account number. For incoming international wires, the SWIFT code is BOHIUS77.

One timing note: Hawaii does not observe daylight saving time and operates in the Hawaii-Aleutian Time Zone, 5-6 hours behind Eastern Time depending on the season. ACH processing windows and wire transfer cutoffs are based on Eastern Time, so plan transfers accordingly to avoid missed deadlines.

Find your routing number in the Bank of Hawaii mobile app, at boh.com under account details, on the bottom-left corner of a check, or at any Bank of Hawaii branch.

The Pacific island branch network

What makes Bank of Hawaii unique is its branch presence across the western Pacific. The bank operates full-service branches in Guam and Saipan in the Commonwealth of the Northern Mariana Islands — both home to significant US military installations. For military families and federal employees stationed across the Pacific, Bank of Hawaii offers something no mainland bank provides: a physical branch presence on islands where national banks have no footprint. A service member transferring from Pearl Harbor to Andersen Air Force Base in Guam can walk into a Bank of Hawaii branch at both duty stations. The bank's Pacific relationships also make it a natural conduit for cross-Pacific transactions that mainland banks rarely handle.

How Slash serves teams spread across time zones and oceans

Companies with distributed teams — across Hawaiian islands, Pacific military installations, or the mainland — need banking that doesn't depend on branch proximity or business-hours phone calls. Slash provides 24/7 visibility into account activity, instant virtual card issuance for team members anywhere, and automated spend policies that work across every time zone. When your finance team is in New York but your operations run in Honolulu, Slash makes sure the money moves on everyone's schedule.