ZIP Code 37151 — Riddleton, TN
37151 is a standard (street delivery) ZIP code serving Riddleton, Tennessee, in Smith 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 37151 at a glance
| ZIP code | 37151 |
|---|---|
| Primary city | Riddleton |
| State | Tennessee (TN) |
| County | Smith FIPS 47159 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 457 |
| Coordinates | 36.312880, -86.045360 |
How ZIP+4 works in 37151
The four digits after the hyphen encode a delivery segment inside 37151. 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 37151 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 37151.
| ZIP | City | Distance |
|---|---|---|
| 37030 | Carthage, TN | 5.9 mi |
| 37057 | Dixon Springs, TN | 6.4 mi |
| 38563 | Gordonsville, TN | 8.2 mi |
| 37145 | Pleasant Shade, TN | 8.8 mi |
| 37074 | Hartsville, TN | 9.1 mi |
| 38560 | Elmwood, TN | 11.1 mi |
| 38547 | Brush Creek, TN | 11.5 mi |
| 37087 | Lebanon, TN | 12.9 mi |
| 38567 | Hickman, TN | 14.3 mi |
| 38552 | Chestnut Mound, TN | 14.6 mi |
| 37031 | Castalian Springs, TN | 14.9 mi |
| 37083 | Lafayette, TN | 16.1 mi |
Questions about 37151
What is the ZIP+4 code for 37151?
37151 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 37151, you need to look up a specific street address to get them.
What city is 37151?
37151 is assigned to Riddleton, Tennessee, in Smith 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.