ZIP Code 78837 — Comstock, TX
78837 is a standard (street delivery) ZIP code serving Comstock, Texas, in Val Verde 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 78837 at a glance
| ZIP code | 78837 |
|---|---|
| Primary city | Comstock |
| State | Texas (TX) |
| County | Val Verde FIPS 48465 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 128 |
| Coordinates | 29.927080, -101.280570 |
How ZIP+4 works in 78837
The four digits after the hyphen encode a delivery segment inside 78837. 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 78837 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 78837.
| ZIP | City | Distance |
|---|---|---|
| 78841 | Del Rio, TX | 12.4 mi |
| 78871 | Langtry, TX | 20.4 mi |
| 78840 | Del Rio, TX | 24.8 mi |
| 78842 | Del Rio, TX | 25.7 mi |
Questions about 78837
What is the ZIP+4 code for 78837?
78837 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 78837, you need to look up a specific street address to get them.
What city is 78837?
78837 is assigned to Comstock, Texas, in Val Verde 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.