ZIP Code 78618 — Doss, TX
78618 is a standard (street delivery) ZIP code serving Doss, Texas, in Gillespie 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 78618 at a glance
| ZIP code | 78618 |
|---|---|
| Primary city | Doss |
| State | Texas (TX) |
| County | Gillespie FIPS 48171 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 346 |
| Coordinates | 30.486240, -99.167940 |
How ZIP+4 works in 78618
The four digits after the hyphen encode a delivery segment inside 78618. 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 78618 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 78618.
| ZIP | City | Distance |
|---|---|---|
| 78631 | Harper, TX | 12.9 mi |
| 76856 | Mason, TX | 16.1 mi |
| 76831 | Castell, TX | 21.9 mi |
| 78624 | Fredericksburg, TX | 22.1 mi |
| 76820 | Art, TX | 22.4 mi |
| 76854 | London, TX | 22.9 mi |
| 78675 | Willow City, TX | 27.6 mi |
| 78025 | Ingram, TX | 28.9 mi |
| 76842 | Fredonia, TX | 30.1 mi |
| 78643 | Llano, TX | 30.2 mi |
| 78028 | Kerrville, TX | 30.7 mi |
| 76869 | Pontotoc, TX | 31.4 mi |
Questions about 78618
What is the ZIP+4 code for 78618?
78618 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 78618, you need to look up a specific street address to get them.
What city is 78618?
78618 is assigned to Doss, Texas, in Gillespie 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.