ZIP Code 63401 — Hannibal, MO
63401 is a standard (street delivery) ZIP code serving Hannibal, Missouri, in Marion 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 63401 at a glance
| ZIP code | 63401 |
|---|---|
| Primary city | Hannibal |
| State | Missouri (MO) |
| County | Marion FIPS 29127 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 21,489 |
| Coordinates | 39.690460, -91.459860 |
How ZIP+4 works in 63401
The four digits after the hyphen encode a delivery segment inside 63401. 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 63401 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 63401.
| ZIP | City | Distance |
|---|---|---|
| 63459 | New London, MO | 8.5 mi |
| 63461 | Palmyra, MO | 9 mi |
| 63467 | Saverton, MO | 10.7 mi |
| 62343 | Hull, IL | 11.6 mi |
| 62360 | Payson, IL | 13.7 mi |
| 63436 | Center, MO | 13.8 mi |
| 63456 | Monroe City, MO | 14.4 mi |
| 63471 | Taylor, MO | 16.4 mi |
| 63441 | Frankford, MO | 16.6 mi |
| 62301 | Quincy, IL | 17.1 mi |
| 62365 | Plainville, IL | 17.5 mi |
| 62305 | Quincy, IL | 17.6 mi |
Questions about 63401
What is the ZIP+4 code for 63401?
63401 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 63401, you need to look up a specific street address to get them.
What city is 63401?
63401 is assigned to Hannibal, Missouri, in Marion 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.