ZIP Code 33584 — Seffner, FL
33584 is a standard (street delivery) ZIP code serving Seffner, Florida, in Hillsborough 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 33584 at a glance
| ZIP code | 33584 |
|---|---|
| Primary city | Seffner |
| State | Florida (FL) |
| County | Hillsborough FIPS 12057 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 28,579 |
| Coordinates | 28.006370, -82.289590 |
How ZIP+4 works in 33584
The four digits after the hyphen encode a delivery segment inside 33584. 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 33584 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 33584.
| ZIP | City | Distance |
|---|---|---|
| 33550 | Mango, FL | 2.1 mi |
| 33510 | Brandon, FL | 3.6 mi |
| 33527 | Dover, FL | 5.1 mi |
| 33637 | Tampa, FL | 5.2 mi |
| 33594 | Valrico, FL | 5.4 mi |
| 33610 | Tampa, FL | 5.6 mi |
| 33592 | Thonotosassa, FL | 6.5 mi |
| 33511 | Brandon, FL | 6.7 mi |
| 33617 | Tampa, FL | 6.7 mi |
| 33619 | Tampa, FL | 7.3 mi |
| 33620 | Tampa, FL | 8.3 mi |
| 33596 | Valrico, FL | 8.8 mi |
Questions about 33584
What is the ZIP+4 code for 33584?
33584 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 33584, you need to look up a specific street address to get them.
What city is 33584?
33584 is assigned to Seffner, Florida, in Hillsborough 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.