ZIP Code 78066 — Rio Medina, TX
78066 is a standard (street delivery) ZIP code serving Rio Medina, Texas, in Medina 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 78066 at a glance
| ZIP code | 78066 |
|---|---|
| Primary city | Rio Medina |
| State | Texas (TX) |
| County | Medina FIPS 48325 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 259 |
| Coordinates | 29.490650, -98.890420 |
How ZIP+4 works in 78066
The four digits after the hyphen encode a delivery segment inside 78066. 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 78066 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 78066.
| ZIP | City | Distance |
|---|---|---|
| 78056 | Mico, TX | 4.5 mi |
| 78253 | San Antonio, TX | 6.3 mi |
| 78009 | Castroville, TX | 8.8 mi |
| 78254 | San Antonio, TX | 10.1 mi |
| 78245 | San Antonio, TX | 11.2 mi |
| 78023 | Helotes, TX | 11.9 mi |
| 78039 | La Coste, TX | 12.9 mi |
| 78251 | San Antonio, TX | 12.9 mi |
| 78250 | San Antonio, TX | 13.5 mi |
| 78063 | Pipe Creek, TX | 13.7 mi |
| 78252 | San Antonio, TX | 15.5 mi |
| 78238 | San Antonio, TX | 16.3 mi |
Questions about 78066
What is the ZIP+4 code for 78066?
78066 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 78066, you need to look up a specific street address to get them.
What city is 78066?
78066 is assigned to Rio Medina, Texas, in Medina 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.