ZIP Code 77021 — Houston, TX
77021 is a standard (street delivery) ZIP code serving Houston, 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 77021 at a glance
| ZIP code | 77021 |
|---|---|
| Primary city | Houston |
| State | Texas (TX) |
| County | Harris FIPS 48201 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 26,153 |
| Coordinates | 29.697130, -95.357510 |
How ZIP+4 works in 77021
The four digits after the hyphen encode a delivery segment inside 77021. 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 77021 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 Houston
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 77021.
| ZIP | City | Distance |
|---|---|---|
| 77204 | Houston, TX | 1.9 mi |
| 77004 | Houston, TX | 2 mi |
| 77033 | Houston, TX | 2.3 mi |
| 77030 | Houston, TX | 2.8 mi |
| 77023 | Houston, TX | 2.9 mi |
| 77054 | Houston, TX | 3 mi |
| 77051 | Houston, TX | 3.2 mi |
| 77087 | Houston, TX | 3.3 mi |
| 77006 | Houston, TX | 3.6 mi |
| 77003 | Houston, TX | 3.7 mi |
| 77010 | Houston, TX | 3.9 mi |
| 77002 | Houston, TX | 4.1 mi |
Questions about 77021
What is the ZIP+4 code for 77021?
77021 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 77021, you need to look up a specific street address to get them.
What city is 77021?
77021 is assigned to Houston, 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.