ZIP Code 64491 — Tarkio, MO
64491 is a standard (street delivery) ZIP code serving Tarkio, Missouri, in Atchison 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 64491 at a glance
| ZIP code | 64491 |
|---|---|
| Primary city | Tarkio |
| State | Missouri (MO) |
| County | Atchison FIPS 29005 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,638 |
| Coordinates | 40.448680, -95.344990 |
How ZIP+4 works in 64491
The four digits after the hyphen encode a delivery segment inside 64491. 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 64491 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 64491.
| ZIP | City | Distance |
|---|---|---|
| 64498 | Westboro, MO | 6.5 mi |
| 64446 | Fairfax, MO | 9.3 mi |
| 64482 | Rock Port, MO | 10.4 mi |
| 51647 | Northboro, IA | 10.8 mi |
| 64445 | Elmo, MO | 12.4 mi |
| 51630 | Blanchard, IA | 13.2 mi |
| 64428 | Burlington Junction, MO | 13.5 mi |
| 64496 | Watson, MO | 15 mi |
| 64487 | Skidmore, MO | 15.8 mi |
| 51636 | Coin, IA | 16.1 mi |
| 51637 | College Springs, IA | 16.8 mi |
| 68321 | Brownville, NE | 18.7 mi |
Questions about 64491
What is the ZIP+4 code for 64491?
64491 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 64491, you need to look up a specific street address to get them.
What city is 64491?
64491 is assigned to Tarkio, Missouri, in Atchison 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.