| City: | Hilo, Hawaii |
| County: | Hawaii County |
| Timezone: | Hawaii-Aleutian Islands (GMT -10:00) |
| Local Time: | 9:35:32 PM |
| Population: | No Population Data |
| Area Code: | 808 |
| Classification: | PO Box |
| Coordinates: | 19.7297, -155.0901 |
| Quick Link: |
ZIP code 96721 serves as one of the PO Box ZIP codes for downtown Hilo on Hawaii's Big Island. This isn't a residential area. It's a postal facility designation that exists within the larger Hilo ZIP code 96720. The 1,912 PO Boxes here serve Hilo area residents and businesses who prefer or need post office box service over street delivery.
The only street address associated with this ZIP is Waianuenue Avenue, which is the post office's physical location. All 155 street-style records use this address with unit numbers. This is PO Box Street Addressing (PBSA), which lets customers use the post office's street address with their box number instead of "PO Box 123."
Hilo is the county seat and largest city in Hawaii County, located on the eastern coast of the Big Island. While 96721 doesn't have its own residential population, the post office serves a busy metropolitan area. With 225 business delivery points registered to this ZIP, local companies use these boxes for their mailing addresses. Street delivery in the surrounding area comes through ZIP 96720, the standard Hilo ZIP code.
The single street address is the post office building on Waianuenue Avenue, used for PO Box Street Addressing.
ZIP Code 96721 supports both business and residential activity. According to the Business Census (2024), there are 9 business establishments, employing about 26 people with an annual payroll of $1,178,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 3,500Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 9Source: CBP |
| 1st Quarter Payroll: | $298,000Source: CBP |
| Annual Payroll: | $1,178,000Source: CBP |
| # of Employees: | 26Source: CBP |
ZIP Code 96721 is located in Hawaii County, Hawaii, within the Hilo-Kailua, HI Metropolitan Statistical Area (CBSA 25900) and Hawaii's 2nd Congressional District. This Micro area has a population of 203,684 people, about 0.00% of whom live in ZIP Code 96721. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Hilo-Kailua, HISource: Census |
| CBSA Number: | 25900Source: Census |
| CBSA Type: | MicroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 203,684Source: Census |
| MSA: | Source: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 02Source: USPS |
| Congressional Land Area: | 6213.4 sq miSource: Census |
| PMSA: | Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 1514650Source: Census |
| Place Name: | Hilo CDP; HawaiiSource: Census |
We could not locate which school district 96721 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.