ZIP Code 37640 — Butler, TN
37640 is a standard (street delivery) ZIP code serving Butler, Tennessee, in Johnson 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 37640 at a glance
| ZIP code | 37640 |
|---|---|
| Primary city | Butler |
| State | Tennessee (TN) |
| County | Johnson FIPS 47091 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 3,851 |
| Coordinates | 36.330230, -81.977300 |
How ZIP+4 works in 37640
The four digits after the hyphen encode a delivery segment inside 37640. 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 37640 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 37640.
| ZIP | City | Distance |
|---|---|---|
| 28679 | Sugar Grove, NC | 9 mi |
| 37643 | Elizabethton, TN | 9.4 mi |
| 28622 | Elk Park, NC | 9.5 mi |
| 37658 | Hampton, TN | 10.8 mi |
| 28692 | Vilas, NC | 10.8 mi |
| 37687 | Roan Mountain, TN | 11.9 mi |
| 37683 | Mountain City, TN | 12.1 mi |
| 37691 | Trade, TN | 12.6 mi |
| 28604 | Banner Elk, NC | 12.8 mi |
| 28698 | Zionville, NC | 13.4 mi |
| 37688 | Shady Valley, TN | 15.8 mi |
| 37618 | Bluff City, TN | 15.9 mi |
Questions about 37640
What is the ZIP+4 code for 37640?
37640 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 37640, you need to look up a specific street address to get them.
What city is 37640?
37640 is assigned to Butler, Tennessee, in Johnson 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.