ZIP Code 84321 — Logan, UT
84321 is a standard (street delivery) ZIP code serving Logan, Utah, in Cache 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 84321 at a glance
| ZIP code | 84321 |
|---|---|
| Primary city | Logan |
| State | Utah (UT) |
| County | Cache FIPS 49005 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 51,702 |
| Coordinates | 41.779380, -111.683160 |
How ZIP+4 works in 84321
The four digits after the hyphen encode a delivery segment inside 84321. 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 84321 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.
Other ZIP codes in Logan
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 84321.
| ZIP | City | Distance |
|---|---|---|
| 84318 | Hyde Park, UT | 6.4 mi |
| 84341 | Logan, UT | 6.6 mi |
| 84322 | Logan, UT | 6.8 mi |
| 84332 | Providence, UT | 8.5 mi |
| 84326 | Millville, UT | 10.1 mi |
| 84335 | Smithfield, UT | 10.7 mi |
| 84333 | Richmond, UT | 10.8 mi |
| 84319 | Hyrum, UT | 12.9 mi |
| 84320 | Lewiston, UT | 15.2 mi |
| 84338 | Trenton, UT | 15.8 mi |
| 84325 | Mendon, UT | 16.2 mi |
| 84304 | Cache Junction, UT | 16.6 mi |
Questions about 84321
What is the ZIP+4 code for 84321?
84321 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 84321, you need to look up a specific street address to get them.
What city is 84321?
84321 is assigned to Logan, Utah, in Cache 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.