ZIP Code 99623 — Wasilla, AK
99623 is a standard (street delivery) ZIP code serving Wasilla, Alaska, in Matanuska-Susitna 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 99623 at a glance
| ZIP code | 99623 |
|---|---|
| Primary city | Wasilla |
| State | Alaska (AK) |
| County | Matanuska-Susitna FIPS 02170 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Anchorage |
| Population | 23,424 |
| Coordinates | 61.429190, -149.912260 |
How ZIP+4 works in 99623
The four digits after the hyphen encode a delivery segment inside 99623. 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 99623 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.
Other ZIP codes in Wasilla
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 99623.
| ZIP | City | Distance |
|---|---|---|
| 99652 | Big Lake, AK | 6.9 mi |
| 99506 | Jber, AK | 11.9 mi |
| 99694 | Houston, AK | 13.4 mi |
| 99505 | Jber, AK | 13.7 mi |
| 99501 | Anchorage, AK | 14.5 mi |
| 99513 | Anchorage, AK | 14.8 mi |
| 99508 | Anchorage, AK | 16 mi |
| 99517 | Anchorage, AK | 16.5 mi |
| 99530 | Anchorage, AK | 17 mi |
| 99502 | Anchorage, AK | 18.5 mi |
| 99518 | Anchorage, AK | 18.6 mi |
| 99504 | Anchorage, AK | 18.6 mi |
Questions about 99623
What is the ZIP+4 code for 99623?
99623 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 99623, you need to look up a specific street address to get them.
What city is 99623?
99623 is assigned to Wasilla, Alaska, in Matanuska-Susitna 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.