ZIP Code 38581 — Rock Island, TN
38581 is a standard (street delivery) ZIP code serving Rock Island, Tennessee, in Warren 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 38581 at a glance
| ZIP code | 38581 |
|---|---|
| Primary city | Rock Island |
| State | Tennessee (TN) |
| County | Warren FIPS 47177 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 4,079 |
| Coordinates | 35.738340, -85.621410 |
How ZIP+4 works in 38581
The four digits after the hyphen encode a delivery segment inside 38581. 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 38581 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 38581.
| ZIP | City | Distance |
|---|---|---|
| 38550 | Campaign, TN | 2.3 mi |
| 38579 | Quebeck, TN | 7.6 mi |
| 38559 | Doyle, TN | 7.7 mi |
| 38587 | Walling, TN | 8.9 mi |
| 37110 | Mcminnville, TN | 9.4 mi |
| 38585 | Spencer, TN | 11.6 mi |
| 37166 | Smithville, TN | 15.9 mi |
| 38583 | Sparta, TN | 17.7 mi |
| 37394 | Viola, TN | 19.2 mi |
| 37357 | Morrison, TN | 19.4 mi |
| 37305 | Beersheba Springs, TN | 19.9 mi |
| 37059 | Dowelltown, TN | 23.4 mi |
Questions about 38581
What is the ZIP+4 code for 38581?
38581 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 38581, you need to look up a specific street address to get them.
What city is 38581?
38581 is assigned to Rock Island, Tennessee, in Warren 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.