ZIP Code 77377 — Tomball, TX
77377 is a standard (street delivery) ZIP code serving Tomball, Texas, in Harris 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 77377 at a glance
| ZIP code | 77377 |
|---|---|
| Primary city | Tomball |
| State | Texas (TX) |
| County | Harris FIPS 48201 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 41,680 |
| Coordinates | 30.061410, -95.676080 |
How ZIP+4 works in 77377
The four digits after the hyphen encode a delivery segment inside 77377. 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 77377 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.
Other ZIP codes in Tomball
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 77377.
| ZIP | City | Distance |
|---|---|---|
| 77429 | Cypress, TX | 5 mi |
| 77375 | Tomball, TX | 5.6 mi |
| 77362 | Pinehurst, TX | 6.8 mi |
| 77355 | Magnolia, TX | 8 mi |
| 77070 | Houston, TX | 8.4 mi |
| 77433 | Cypress, TX | 8.6 mi |
| 77379 | Spring, TX | 8.7 mi |
| 77447 | Hockley, TX | 9.1 mi |
| 77065 | Houston, TX | 10.3 mi |
| 77354 | Magnolia, TX | 10.4 mi |
| 77069 | Houston, TX | 10.5 mi |
| 77095 | Houston, TX | 10.6 mi |
Questions about 77377
What is the ZIP+4 code for 77377?
77377 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 77377, you need to look up a specific street address to get them.
What city is 77377?
77377 is assigned to Tomball, Texas, in Harris 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.