ZIP Code 78101 — Adkins, TX
78101 is a standard (street delivery) ZIP code serving Adkins, Texas, in Bexar 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 78101 at a glance
| ZIP code | 78101 |
|---|---|
| Primary city | Adkins |
| State | Texas (TX) |
| County | Bexar FIPS 48029 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 7,267 |
| Coordinates | 29.344440, -98.233160 |
How ZIP+4 works in 78101
The four digits after the hyphen encode a delivery segment inside 78101. 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 78101 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 78101.
| ZIP | City | Distance |
|---|---|---|
| 78263 | San Antonio, TX | 4.8 mi |
| 78152 | Saint Hedwig, TX | 6.2 mi |
| 78121 | La Vernia, TX | 7.9 mi |
| 78222 | San Antonio, TX | 9.2 mi |
| 78223 | San Antonio, TX | 9.5 mi |
| 78109 | Converse, TX | 10 mi |
| 78220 | San Antonio, TX | 11.2 mi |
| 78219 | San Antonio, TX | 11.3 mi |
| 78244 | San Antonio, TX | 11.6 mi |
| 78161 | Sutherland Springs, TX | 11.7 mi |
| 78112 | Elmendorf, TX | 12.3 mi |
| 78235 | San Antonio, TX | 12.4 mi |
Questions about 78101
What is the ZIP+4 code for 78101?
78101 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 78101, you need to look up a specific street address to get them.
What city is 78101?
78101 is assigned to Adkins, Texas, in Bexar 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.