ZIP Code 99577 — Eagle River, AK
99577 is a standard (street delivery) ZIP code serving Eagle River, Alaska, in Anchorage 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 99577 at a glance
| ZIP code | 99577 |
|---|---|
| Primary city | Eagle River |
| State | Alaska (AK) |
| County | Anchorage FIPS 02020 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Anchorage |
| Population | 28,477 |
| Coordinates | 61.182400, -149.292290 |
How ZIP+4 works in 99577
The four digits after the hyphen encode a delivery segment inside 99577. 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 99577 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 99577.
| ZIP | City | Distance |
|---|---|---|
| 99504 | Anchorage, AK | 11.7 mi |
| 99540 | Indian, AK | 11.9 mi |
| 99505 | Jber, AK | 13.6 mi |
| 99507 | Anchorage, AK | 13.7 mi |
| 99567 | Chugiak, AK | 15.2 mi |
| 99516 | Anchorage, AK | 16.1 mi |
| 99508 | Anchorage, AK | 17.4 mi |
| 99506 | Jber, AK | 17.8 mi |
| 99501 | Anchorage, AK | 19 mi |
| 99518 | Anchorage, AK | 19.8 mi |
| 99513 | Anchorage, AK | 19.9 mi |
| 99515 | Anchorage, AK | 20.3 mi |
Questions about 99577
What is the ZIP+4 code for 99577?
99577 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 99577, you need to look up a specific street address to get them.
What city is 99577?
99577 is assigned to Eagle River, Alaska, in Anchorage 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.