ZIP Code 70403 — Hammond, LA
70403 is a standard (street delivery) ZIP code serving Hammond, Louisiana, in Tangipahoa 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 70403 at a glance
| ZIP code | 70403 |
|---|---|
| Primary city | Hammond |
| State | Louisiana (LA) |
| County | Tangipahoa FIPS 22105 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 30,173 |
| Coordinates | 30.479890, -90.486390 |
How ZIP+4 works in 70403
The four digits after the hyphen encode a delivery segment inside 70403. 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 70403 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 Hammond
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 70403.
| ZIP | City | Distance |
|---|---|---|
| 70402 | Hammond, LA | 2.7 mi |
| 70401 | Hammond, LA | 3.8 mi |
| 70451 | Natalbany, LA | 4.8 mi |
| 70466 | Tickfaw, LA | 6.2 mi |
| 70711 | Albany, LA | 7.7 mi |
| 70454 | Ponchatoula, LA | 9.1 mi |
| 70462 | Springfield, LA | 9.8 mi |
| 70455 | Robert, LA | 10.4 mi |
| 70443 | Independence, LA | 10.8 mi |
| 70744 | Holden, LA | 12.7 mi |
| 70446 | Loranger, LA | 13.4 mi |
| 70754 | Livingston, LA | 16.2 mi |
Questions about 70403
What is the ZIP+4 code for 70403?
70403 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 70403, you need to look up a specific street address to get them.
What city is 70403?
70403 is assigned to Hammond, Louisiana, in Tangipahoa 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.