ZIP Code 97640 — Summer Lake, OR
97640 is a standard (street delivery) ZIP code serving Summer Lake, Oregon, in Lake 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 97640 at a glance
| ZIP code | 97640 |
|---|---|
| Primary city | Summer Lake |
| State | Oregon (OR) |
| County | Lake FIPS 41037 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 159 |
| Coordinates | 42.907420, -120.653810 |
How ZIP+4 works in 97640
The four digits after the hyphen encode a delivery segment inside 97640. 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 97640 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 97640.
| ZIP | City | Distance |
|---|---|---|
| 97636 | Paisley, OR | 15.8 mi |
| 97638 | Silver Lake, OR | 24.4 mi |
| 97641 | Christmas Valley, OR | 26.9 mi |
| 97735 | Fort Rock, OR | 37.4 mi |
Questions about 97640
What is the ZIP+4 code for 97640?
97640 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 97640, you need to look up a specific street address to get them.
What city is 97640?
97640 is assigned to Summer Lake, Oregon, in Lake 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.