ZIP Code 63367 — Lake Saint Louis, MO
63367 is a standard (street delivery) ZIP code serving Lake Saint Louis, Missouri, in St. Charles 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 63367 at a glance
| ZIP code | 63367 |
|---|---|
| Primary city | Lake Saint Louis |
| State | Missouri (MO) |
| County | St. Charles FIPS 29183 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 29,725 |
| Coordinates | 38.778050, -90.795360 |
How ZIP+4 works in 63367
The four digits after the hyphen encode a delivery segment inside 63367. 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 63367 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 63367.
| ZIP | City | Distance |
|---|---|---|
| 63385 | Wentzville, MO | 3.5 mi |
| 63368 | O'fallon, MO | 4 mi |
| 63365 | New Melle, MO | 6.3 mi |
| 63366 | O'fallon, MO | 6.9 mi |
| 63304 | Saint Charles, MO | 7.7 mi |
| 63341 | Defiance, MO | 7.9 mi |
| 63348 | Foristell, MO | 7.9 mi |
| 63376 | Saint Peters, MO | 9.7 mi |
| 63369 | Old Monroe, MO | 11 mi |
| 63362 | Moscow Mills, MO | 11.7 mi |
| 63005 | Chesterfield, MO | 12.2 mi |
| 63332 | Augusta, MO | 13.3 mi |
Questions about 63367
What is the ZIP+4 code for 63367?
63367 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 63367, you need to look up a specific street address to get them.
What city is 63367?
63367 is assigned to Lake Saint Louis, Missouri, in St. Charles 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.