ZIP Code 76666 — Mertens, TX
76666 is a standard (street delivery) ZIP code serving Mertens, Texas, in Hill 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 76666 at a glance
| ZIP code | 76666 |
|---|---|
| Primary city | Mertens |
| State | Texas (TX) |
| County | Hill FIPS 48217 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 261 |
| Coordinates | 32.046530, -96.891780 |
How ZIP+4 works in 76666
The four digits after the hyphen encode a delivery segment inside 76666. 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 76666 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 76666.
| ZIP | City | Distance |
|---|---|---|
| 76650 | Irene, TX | 4.2 mi |
| 76628 | Brandon, TX | 4.8 mi |
| 76641 | Frost, TX | 6.1 mi |
| 76631 | Bynum, TX | 6.2 mi |
| 76670 | Milford, TX | 8 mi |
| 76660 | Malone, TX | 8 mi |
| 76651 | Italy, TX | 9.5 mi |
| 76626 | Blooming Grove, TX | 11 mi |
| 76676 | Penelope, TX | 12.7 mi |
| 76623 | Avalon, TX | 13.3 mi |
| 76041 | Forreston, TX | 13.4 mi |
| 76645 | Hillsboro, TX | 14 mi |
Questions about 76666
What is the ZIP+4 code for 76666?
76666 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 76666, you need to look up a specific street address to get them.
What city is 76666?
76666 is assigned to Mertens, Texas, in Hill 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.