ZIP Code 98303 — Anderson Island, WA
98303 is a standard (street delivery) ZIP code serving Anderson Island, Washington, in Pierce 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 98303 at a glance
| ZIP code | 98303 |
|---|---|
| Primary city | Anderson Island |
| State | Washington (WA) |
| County | Pierce FIPS 53053 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 1,448 |
| Coordinates | 47.157830, -122.703870 |
How ZIP+4 works in 98303
The four digits after the hyphen encode a delivery segment inside 98303. 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 98303 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 98303.
| ZIP | City | Distance |
|---|---|---|
| 98388 | Steilacoom, WA | 3.4 mi |
| 98351 | Longbranch, WA | 4.3 mi |
| 98327 | Dupont, WA | 4.4 mi |
| 98516 | Olympia, WA | 5.6 mi |
| 98433 | Tacoma, WA | 6.4 mi |
| 98498 | Lakewood, WA | 6.8 mi |
| 98430 | Camp Murray, WA | 6.9 mi |
| 98333 | Fox Island, WA | 7.2 mi |
| 98467 | University Place, WA | 8.1 mi |
| 98349 | Lakebay, WA | 8.1 mi |
| 98506 | Olympia, WA | 8.8 mi |
| 98466 | Tacoma, WA | 9.3 mi |
Questions about 98303
What is the ZIP+4 code for 98303?
98303 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 98303, you need to look up a specific street address to get them.
What city is 98303?
98303 is assigned to Anderson Island, Washington, in Pierce 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.