ZIP Code 98237 — Concrete, WA
98237 is a standard (street delivery) ZIP code serving Concrete, Washington, in Skagit 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 98237 at a glance
| ZIP code | 98237 |
|---|---|
| Primary city | Concrete |
| State | Washington (WA) |
| County | Skagit FIPS 53057 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 4,956 |
| Coordinates | 48.532720, -121.697480 |
How ZIP+4 works in 98237
The four digits after the hyphen encode a delivery segment inside 98237. 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 98237 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 98237.
| ZIP | City | Distance |
|---|---|---|
| 98255 | Hamilton, WA | 13.5 mi |
| 98263 | Lyman, WA | 16.8 mi |
| 98267 | Marblemount, WA | 19 mi |
| 98284 | Sedro Woolley, WA | 19.2 mi |
| 98244 | Deming, WA | 21.1 mi |
| 98274 | Mount Vernon, WA | 23.6 mi |
| 98235 | Clearlake, WA | 24.8 mi |
| 98223 | Arlington, WA | 25.1 mi |
| 98220 | Acme, WA | 25.1 mi |
| 98283 | Rockport, WA | 26 mi |
| 98241 | Darrington, WA | 27.6 mi |
| 98252 | Granite Falls, WA | 32.5 mi |
Questions about 98237
What is the ZIP+4 code for 98237?
98237 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 98237, you need to look up a specific street address to get them.
What city is 98237?
98237 is assigned to Concrete, Washington, in Skagit 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.