ZIP Code 78584 — Roma, TX
78584 is a standard (street delivery) ZIP code serving Roma, Texas, in Starr 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 78584 at a glance
| ZIP code | 78584 |
|---|---|
| Primary city | Roma |
| State | Texas (TX) |
| County | Starr FIPS 48427 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 18,464 |
| Coordinates | 26.562260, -98.984710 |
How ZIP+4 works in 78584
The four digits after the hyphen encode a delivery segment inside 78584. 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 78584 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 78584.
| ZIP | City | Distance |
|---|---|---|
| 78585 | Salineno, TX | 7.8 mi |
| 78545 | Falcon Heights, TX | 9.7 mi |
| 78564 | Lopeno, TX | 12.1 mi |
| 78582 | Rio Grande City, TX | 15.2 mi |
| 78360 | Guerra, TX | 22.6 mi |
| 78547 | Garciasville, TX | 24.9 mi |
| 78076 | Zapata, TX | 27.1 mi |
| 78548 | Grulla, TX | 28.3 mi |
| 78591 | Santa Elena, TX | 28.5 mi |
| 78595 | Sullivan City, TX | 32.3 mi |
| 78536 | Delmita, TX | 33.9 mi |
| 78565 | Los Ebanos, TX | 34.1 mi |
Questions about 78584
What is the ZIP+4 code for 78584?
78584 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 78584, you need to look up a specific street address to get them.
What city is 78584?
78584 is assigned to Roma, Texas, in Starr 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.