ZIP Code 63473 — Williamstown, MO
63473 is a standard (street delivery) ZIP code serving Williamstown, Missouri, in Lewis 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 63473 at a glance
| ZIP code | 63473 |
|---|---|
| Primary city | Williamstown |
| State | Missouri (MO) |
| County | Lewis FIPS 29111 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 375 |
| Coordinates | 40.252630, -91.778030 |
How ZIP+4 works in 63473
The four digits after the hyphen encode a delivery segment inside 63473. 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 63473 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 63473.
| ZIP | City | Distance |
|---|---|---|
| 63457 | Monticello, MO | 6.8 mi |
| 63466 | Saint Patrick, MO | 8.5 mi |
| 63474 | Wyaconda, MO | 9 mi |
| 63445 | Kahoka, MO | 10.4 mi |
| 63435 | Canton, MO | 10.8 mi |
| 63452 | Lewistown, MO | 11 mi |
| 63447 | La Belle, MO | 12.9 mi |
| 63543 | Gorin, MO | 14.2 mi |
| 63446 | Knox City, MO | 14.3 mi |
| 63472 | Wayland, MO | 14.9 mi |
| 63430 | Alexandria, MO | 15.7 mi |
| 63563 | Rutledge, MO | 16 mi |
Questions about 63473
What is the ZIP+4 code for 63473?
63473 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 63473, you need to look up a specific street address to get them.
What city is 63473?
63473 is assigned to Williamstown, Missouri, in Lewis 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.