ZIP Code 37881 — Thorn Hill, TN
37881 is a standard (street delivery) ZIP code serving Thorn Hill, Tennessee, in Grainger 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 37881 at a glance
| ZIP code | 37881 |
|---|---|
| Primary city | Thorn Hill |
| State | Tennessee (TN) |
| County | Grainger FIPS 47057 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 1,677 |
| Coordinates | 36.398610, -83.343930 |
How ZIP+4 works in 37881
The four digits after the hyphen encode a delivery segment inside 37881. 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 37881 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 37881.
| ZIP | City | Distance |
|---|---|---|
| 37708 | Bean Station, TN | 5.2 mi |
| 37811 | Mooresburg, TN | 7.8 mi |
| 37869 | Sneedville, TN | 9.7 mi |
| 37879 | Tazewell, TN | 9.9 mi |
| 37814 | Morristown, TN | 11.2 mi |
| 37891 | Whitesburg, TN | 13.5 mi |
| 37860 | Russellville, TN | 13.8 mi |
| 37861 | Rutledge, TN | 14.2 mi |
| 37813 | Morristown, TN | 15.9 mi |
| 37888 | Washburn, TN | 16.1 mi |
| 37752 | Harrogate, TN | 16.5 mi |
| 37877 | Talbott, TN | 17.4 mi |
Questions about 37881
What is the ZIP+4 code for 37881?
37881 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 37881, you need to look up a specific street address to get them.
What city is 37881?
37881 is assigned to Thorn Hill, Tennessee, in Grainger 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.