ZIP Code 78638 — Kingsbury, TX
78638 is a standard (street delivery) ZIP code serving Kingsbury, Texas, in Guadalupe 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 78638 at a glance
| ZIP code | 78638 |
|---|---|
| Primary city | Kingsbury |
| State | Texas (TX) |
| County | Guadalupe FIPS 48187 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 2,135 |
| Coordinates | 29.658210, -97.795950 |
How ZIP+4 works in 78638
The four digits after the hyphen encode a delivery segment inside 78638. 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 78638 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 78638.
| ZIP | City | Distance |
|---|---|---|
| 78661 | Prairie Lea, TX | 5.9 mi |
| 78670 | Staples, TX | 7.8 mi |
| 78622 | Fentress, TX | 7.9 mi |
| 78648 | Luling, TX | 9.8 mi |
| 78658 | Ottine, TX | 11.1 mi |
| 78655 | Martindale, TX | 11.6 mi |
| 78155 | Seguin, TX | 12.1 mi |
| 78123 | Mcqueeney, TX | 15.3 mi |
| 78122 | Leesville, TX | 15.4 mi |
| 78644 | Lockhart, TX | 16.4 mi |
| 78130 | New Braunfels, TX | 16.5 mi |
| 78656 | Maxwell, TX | 16.9 mi |
Questions about 78638
What is the ZIP+4 code for 78638?
78638 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 78638, you need to look up a specific street address to get them.
What city is 78638?
78638 is assigned to Kingsbury, Texas, in Guadalupe 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.