ZIP Code 99639 — Ninilchik, AK
99639 is a standard (street delivery) ZIP code serving Ninilchik, Alaska, in Kenai Peninsula 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 99639 at a glance
| ZIP code | 99639 |
|---|---|
| Primary city | Ninilchik |
| State | Alaska (AK) |
| County | Kenai Peninsula FIPS 02122 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Anchorage |
| Population | 1,175 |
| Coordinates | 59.996020, -151.361770 |
How ZIP+4 works in 99639
The four digits after the hyphen encode a delivery segment inside 99639. 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 99639 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 99639.
| ZIP | City | Distance |
|---|---|---|
| 99556 | Anchor Point, AK | 15 mi |
| 99610 | Kasilof, AK | 20.6 mi |
| 99669 | Soldotna, AK | 31.5 mi |
| 99603 | Homer, AK | 32.9 mi |
Questions about 99639
What is the ZIP+4 code for 99639?
99639 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 99639, you need to look up a specific street address to get them.
What city is 99639?
99639 is assigned to Ninilchik, Alaska, in Kenai Peninsula 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.