ZIP Code 37686 — Piney Flats, TN
37686 is a standard (street delivery) ZIP code serving Piney Flats, Tennessee, in Sullivan 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 37686 at a glance
| ZIP code | 37686 |
|---|---|
| Primary city | Piney Flats |
| State | Tennessee (TN) |
| County | Sullivan FIPS 47163 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 9,495 |
| Coordinates | 36.441750, -82.346390 |
How ZIP+4 works in 37686
The four digits after the hyphen encode a delivery segment inside 37686. 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 37686 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 37686.
| ZIP | City | Distance |
|---|---|---|
| 37694 | Watauga, TN | 5.5 mi |
| 37617 | Blountville, TN | 6.4 mi |
| 37615 | Johnson City, TN | 6.6 mi |
| 37618 | Bluff City, TN | 7.8 mi |
| 37663 | Kingsport, TN | 7.9 mi |
| 37601 | Johnson City, TN | 8 mi |
| 37614 | Johnson City, TN | 9.8 mi |
| 37604 | Johnson City, TN | 10 mi |
| 37664 | Kingsport, TN | 10.1 mi |
| 37682 | Milligan, TN | 10.2 mi |
| 37643 | Elizabethton, TN | 12.5 mi |
| 37659 | Jonesborough, TN | 13.8 mi |
Questions about 37686
What is the ZIP+4 code for 37686?
37686 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 37686, you need to look up a specific street address to get them.
What city is 37686?
37686 is assigned to Piney Flats, Tennessee, in Sullivan 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.