ZIP Code 77837 — Calvert, TX
77837 is a standard (street delivery) ZIP code serving Calvert, Texas, in Robertson 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 77837 at a glance
| ZIP code | 77837 |
|---|---|
| Primary city | Calvert |
| State | Texas (TX) |
| County | Robertson FIPS 48395 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,030 |
| Coordinates | 31.007040, -96.677180 |
How ZIP+4 works in 77837
The four digits after the hyphen encode a delivery segment inside 77837. 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 77837 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 77837.
| ZIP | City | Distance |
|---|---|---|
| 76629 | Bremond, TX | 10 mi |
| 77859 | Hearne, TX | 12.9 mi |
| 76680 | Reagan, TX | 14.6 mi |
| 77857 | Gause, TX | 15.9 mi |
| 76520 | Cameron, TX | 16.1 mi |
| 77856 | Franklin, TX | 16.2 mi |
| 76570 | Rosebud, TX | 16.5 mi |
| 77882 | Wheelock, TX | 18.8 mi |
| 77867 | Mumford, TX | 19.4 mi |
| 76653 | Kosse, TX | 20.6 mi |
| 76519 | Burlington, TX | 21.2 mi |
| 76661 | Marlin, TX | 23 mi |
Questions about 77837
What is the ZIP+4 code for 77837?
77837 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 77837, you need to look up a specific street address to get them.
What city is 77837?
77837 is assigned to Calvert, Texas, in Robertson 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.