ZIP Code 64780 — Rockville, MO
64780 is a standard (street delivery) ZIP code serving Rockville, Missouri, in St. Clair 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 64780 at a glance
| ZIP code | 64780 |
|---|---|
| Primary city | Rockville |
| State | Missouri (MO) |
| County | St. Clair FIPS 29185 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 364 |
| Coordinates | 38.062460, -94.042760 |
How ZIP+4 works in 64780
The four digits after the hyphen encode a delivery segment inside 64780. 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 64780 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 64780.
| ZIP | City | Distance |
|---|---|---|
| 64783 | Schell City, MO | 5.6 mi |
| 64724 | Appleton City, MO | 6.4 mi |
| 64750 | Harwood, MO | 9.9 mi |
| 64790 | Walker, MO | 13.7 mi |
| 64781 | Roscoe, MO | 13.8 mi |
| 64770 | Montrose, MO | 15 mi |
| 64744 | El Dorado Springs, MO | 15.1 mi |
| 64763 | Lowry City, MO | 18.6 mi |
| 64730 | Butler, MO | 19.1 mi |
| 64779 | Rich Hill, MO | 19.6 mi |
| 64776 | Osceola, MO | 20 mi |
| 64740 | Deepwater, MO | 21.1 mi |
Questions about 64780
What is the ZIP+4 code for 64780?
64780 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 64780, you need to look up a specific street address to get them.
What city is 64780?
64780 is assigned to Rockville, Missouri, in St. Clair 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.