ZIP Code 78633 — Georgetown, TX
78633 is a standard (street delivery) ZIP code serving Georgetown, Texas, in Williamson 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 78633 at a glance
| ZIP code | 78633 |
|---|---|
| Primary city | Georgetown |
| State | Texas (TX) |
| County | Williamson FIPS 48491 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 29,309 |
| Coordinates | 30.738030, -97.754650 |
How ZIP+4 works in 78633
The four digits after the hyphen encode a delivery segment inside 78633. 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 78633 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 Georgetown
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 78633.
| ZIP | City | Distance |
|---|---|---|
| 78628 | Georgetown, TX | 6.8 mi |
| 76527 | Florence, TX | 7.3 mi |
| 78674 | Weir, TX | 10.4 mi |
| 76537 | Jarrell, TX | 10.4 mi |
| 78626 | Georgetown, TX | 10.5 mi |
| 78642 | Liberty Hill, TX | 11.4 mi |
| 78681 | Round Rock, TX | 14.1 mi |
| 78665 | Round Rock, TX | 14.7 mi |
| 78641 | Leander, TX | 15.6 mi |
| 76573 | Schwertner, TX | 16 mi |
| 78613 | Cedar Park, TX | 16.4 mi |
| 76571 | Salado, TX | 16.8 mi |
Questions about 78633
What is the ZIP+4 code for 78633?
78633 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 78633, you need to look up a specific street address to get them.
What city is 78633?
78633 is assigned to Georgetown, Texas, in Williamson 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.