ZIP Code 32421 — Altha, FL
32421 is a standard (street delivery) ZIP code serving Altha, Florida, in Calhoun 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 32421 at a glance
| ZIP code | 32421 |
|---|---|
| Primary city | Altha |
| State | Florida (FL) |
| County | Calhoun FIPS 12013 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 4,035 |
| Coordinates | 30.529730, -85.193080 |
How ZIP+4 works in 32421
The four digits after the hyphen encode a delivery segment inside 32421. 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 32421 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 32421.
| ZIP | City | Distance |
|---|---|---|
| 32430 | Clarksville, FL | 7.9 mi |
| 32448 | Marianna, FL | 9.5 mi |
| 32424 | Blountstown, FL | 11.7 mi |
| 32438 | Fountain, FL | 13.4 mi |
| 32420 | Alford, FL | 13.4 mi |
| 32432 | Cypress, FL | 14.5 mi |
| 32442 | Grand Ridge, FL | 15.4 mi |
| 32449 | Wewahitchka, FL | 17.5 mi |
| 32466 | Youngstown, FL | 18.9 mi |
| 32431 | Cottondale, FL | 21.9 mi |
| 32446 | Marianna, FL | 21.9 mi |
| 32321 | Bristol, FL | 22.1 mi |
Questions about 32421
What is the ZIP+4 code for 32421?
32421 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 32421, you need to look up a specific street address to get them.
What city is 32421?
32421 is assigned to Altha, Florida, in Calhoun 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.