ZIP Code 63357 — Marthasville, MO
63357 is a standard (street delivery) ZIP code serving Marthasville, Missouri, in Warren 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 63357 at a glance
| ZIP code | 63357 |
|---|---|
| Primary city | Marthasville |
| State | Missouri (MO) |
| County | Warren FIPS 29219 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 6,536 |
| Coordinates | 38.655180, -91.094700 |
How ZIP+4 works in 63357
The four digits after the hyphen encode a delivery segment inside 63357. 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 63357 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 63357.
| ZIP | City | Distance |
|---|---|---|
| 63090 | Washington, MO | 8.8 mi |
| 63068 | New Haven, MO | 10.6 mi |
| 63390 | Wright City, MO | 10.7 mi |
| 63380 | Truesdale, MO | 11 mi |
| 63332 | Augusta, MO | 11.5 mi |
| 63383 | Warrenton, MO | 11.8 mi |
| 63014 | Berger, MO | 11.9 mi |
| 63348 | Foristell, MO | 12.4 mi |
| 63365 | New Melle, MO | 12.5 mi |
| 63341 | Defiance, MO | 14.9 mi |
| 63385 | Wentzville, MO | 16.2 mi |
| 63055 | Labadie, MO | 16.2 mi |
Questions about 63357
What is the ZIP+4 code for 63357?
63357 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 63357, you need to look up a specific street address to get them.
What city is 63357?
63357 is assigned to Marthasville, Missouri, in Warren 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.