ZIP Code 63645 — Fredericktown, MO
63645 is a standard (street delivery) ZIP code serving Fredericktown, Missouri, in Madison 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 63645 at a glance
| ZIP code | 63645 |
|---|---|
| Primary city | Fredericktown |
| State | Missouri (MO) |
| County | Madison FIPS 29123 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 11,554 |
| Coordinates | 37.542040, -90.324280 |
How ZIP+4 works in 63645
The four digits after the hyphen encode a delivery segment inside 63645. 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 63645 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 63645.
| ZIP | City | Distance |
|---|---|---|
| 63655 | Marquand, MO | 12.2 mi |
| 63621 | Arcadia, MO | 14.5 mi |
| 63662 | Patton, MO | 14.8 mi |
| 63640 | Farmington, MO | 14.8 mi |
| 63637 | Doe Run, MO | 15.5 mi |
| 63650 | Ironton, MO | 17.4 mi |
| 63663 | Pilot Knob, MO | 18.5 mi |
| 63950 | Lodi, MO | 19.8 mi |
| 63620 | Annapolis, MO | 20.4 mi |
| 63964 | Silva, MO | 21.2 mi |
| 63751 | Glenallen, MO | 21.5 mi |
| 63781 | Sedgewickville, MO | 21.5 mi |
Questions about 63645
What is the ZIP+4 code for 63645?
63645 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 63645, you need to look up a specific street address to get them.
What city is 63645?
63645 is assigned to Fredericktown, Missouri, in Madison 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.