ZIP Code 96789 — Mililani, HI
96789 is a standard (street delivery) ZIP code serving Mililani, Hawaii, in Honolulu County. To mail something here you only need these five digits — but the four-digit extension narrows delivery to a single point, and it is what USPS bulk postage discounts are priced on.
ZIP code 96789 at a glance
| ZIP code | 96789 |
|---|---|
| Primary city | Mililani |
| State | Hawaii (HI) |
| County | Honolulu FIPS 15003 |
| ZIP type | Standard (street delivery) |
| Time zone | Pacific/Honolulu |
| Population | 54,278 |
| Coordinates | 21.478230, -157.972640 |
How ZIP+4 works in 96789
The four digits after the hyphen encode a delivery segment inside 96789. In practice one segment usually means:
- One side of one block — odd numbers on a street between two cross streets
- A single large building, or one floor of it
- A group of PO boxes, sometimes a single box
- A single business that receives enough mail to warrant its own code
That is why 96789 has no single ZIP+4: two neighbors across the street from each other usually have different ones. Enter a street address above and we will return the exact nine-digit code along with the standardized USPS address format.
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 96789.
| ZIP | City | Distance |
|---|---|---|
| 96782 | Pearl City, HI | 3.4 mi |
| 96786 | Wahiawa, HI | 5.2 mi |
| 96857 | Schofield Barracks, HI | 5.2 mi |
| 96797 | Waipahu, HI | 5.6 mi |
| 96759 | Kunia, HI | 5.7 mi |
| 96701 | Aiea, HI | 7 mi |
| 96717 | Hauula, HI | 7.3 mi |
| 96860 | Jbphh, HI | 8.5 mi |
| 96730 | Kaaawa, HI | 9.1 mi |
| 96744 | Kaneohe, HI | 9.3 mi |
| 96818 | Honolulu, HI | 9.4 mi |
| 96859 | Tripler Army Medical Center, HI | 9.7 mi |
Questions about 96789
What is the ZIP+4 code for 96789?
96789 is the five-digit ZIP code. The ZIP+4 adds four more digits that identify a specific delivery point — usually one side of a city block, a single building, or a group of PO boxes. Because those four digits change from address to address within 96789, you need to look up a specific street address to get them.
What city is 96789?
96789 is assigned to Mililani, Hawaii, in Honolulu County.
Do I need to use the ZIP+4?
It is optional for ordinary mail, but it speeds up sorting and it is required for most USPS bulk-mail postage discounts. Many address-verification and e-commerce systems also use ZIP+4 to confirm a delivery point exists.
Need thousands of these?
Upload a CSV and get ZIP+4, county, carrier route, and delivery-point data appended to every row — or call the API directly.