ZIP Code 77979 — Port Lavaca, TX
77979 is a standard (street delivery) ZIP code serving Port Lavaca, Texas, in Calhoun 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 77979 at a glance
| ZIP code | 77979 |
|---|---|
| Primary city | Port Lavaca |
| State | Texas (TX) |
| County | Calhoun FIPS 48057 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 16,488 |
| Coordinates | 28.602480, -96.601700 |
How ZIP+4 works in 77979
The four digits after the hyphen encode a delivery segment inside 77979. 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 77979 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 77979.
| ZIP | City | Distance |
|---|---|---|
| 77978 | Point Comfort, TX | 6.1 mi |
| 77969 | La Salle, TX | 12.3 mi |
| 77991 | Vanderbilt, TX | 12.7 mi |
| 77982 | Port O'connor, TX | 12.7 mi |
| 77977 | Placedo, TX | 13.3 mi |
| 77983 | Seadrift, TX | 14.3 mi |
| 77971 | Lolita, TX | 16.5 mi |
| 77951 | Bloomington, TX | 18.9 mi |
| 77970 | La Ward, TX | 19.7 mi |
| 77990 | Tivoli, TX | 21.8 mi |
| 77973 | Mcfaddin, TX | 21.8 mi |
| 77961 | Francitas, TX | 22.9 mi |
Questions about 77979
What is the ZIP+4 code for 77979?
77979 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 77979, you need to look up a specific street address to get them.
What city is 77979?
77979 is assigned to Port Lavaca, Texas, in Calhoun 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.