ZIP Code 63388 — Williamsburg, MO
63388 is a standard (street delivery) ZIP code serving Williamsburg, Missouri, in Callaway 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 63388 at a glance
| ZIP code | 63388 |
|---|---|
| Primary city | Williamsburg |
| State | Missouri (MO) |
| County | Callaway FIPS 29027 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 685 |
| Coordinates | 38.888160, -91.749950 |
How ZIP+4 works in 63388
The four digits after the hyphen encode a delivery segment inside 63388. 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 63388 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 63388.
| ZIP | City | Distance |
|---|---|---|
| 65077 | Steedman, MO | 8.7 mi |
| 65067 | Portland, MO | 9.4 mi |
| 63361 | Montgomery City, MO | 11.3 mi |
| 65262 | Kingdom City, MO | 11.8 mi |
| 65231 | Auxvasse, MO | 12.3 mi |
| 65069 | Rhineland, MO | 12.3 mi |
| 65251 | Fulton, MO | 12.6 mi |
| 65264 | Martinsburg, MO | 14.1 mi |
| 65059 | Mokane, MO | 14.6 mi |
| 63363 | New Florence, MO | 15.7 mi |
| 63384 | Wellsville, MO | 17 mi |
| 65024 | Chamois, MO | 18.2 mi |
Questions about 63388
What is the ZIP+4 code for 63388?
63388 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 63388, you need to look up a specific street address to get them.
What city is 63388?
63388 is assigned to Williamsburg, Missouri, in Callaway 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.