ZIP Code 37742 — Greenback, TN
37742 is a standard (street delivery) ZIP code serving Greenback, Tennessee, in Loudon 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 37742 at a glance
| ZIP code | 37742 |
|---|---|
| Primary city | Greenback |
| State | Tennessee (TN) |
| County | Loudon FIPS 47105 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 7,046 |
| Coordinates | 35.675480, -84.180490 |
How ZIP+4 works in 37742
The four digits after the hyphen encode a delivery segment inside 37742. 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 37742 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 37742.
| ZIP | City | Distance |
|---|---|---|
| 37801 | Maryville, TN | 5.4 mi |
| 37737 | Friendsville, TN | 6.6 mi |
| 37772 | Lenoir City, TN | 8 mi |
| 37774 | Loudon, TN | 10.5 mi |
| 37803 | Maryville, TN | 11.4 mi |
| 37885 | Vonore, TN | 12.2 mi |
| 37878 | Tallassee, TN | 12.4 mi |
| 37777 | Louisville, TN | 12.7 mi |
| 37922 | Knoxville, TN | 13.6 mi |
| 37771 | Lenoir City, TN | 13.6 mi |
| 37934 | Farragut, TN | 13.7 mi |
| 37701 | Alcoa, TN | 13.7 mi |
Questions about 37742
What is the ZIP+4 code for 37742?
37742 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 37742, you need to look up a specific street address to get them.
What city is 37742?
37742 is assigned to Greenback, Tennessee, in Loudon 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.