ZIP Code 70390 — Napoleonville, LA
70390 is a standard (street delivery) ZIP code serving Napoleonville, Louisiana, in Assumption 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 70390 at a glance
| ZIP code | 70390 |
|---|---|
| Primary city | Napoleonville |
| State | Louisiana (LA) |
| County | Assumption FIPS 22007 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 7,160 |
| Coordinates | 29.890680, -91.036160 |
How ZIP+4 works in 70390
The four digits after the hyphen encode a delivery segment inside 70390. 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 70390 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 70390.
| ZIP | City | Distance |
|---|---|---|
| 70391 | Paincourtville, LA | 7.4 mi |
| 70393 | Plattenville, LA | 7.6 mi |
| 70372 | Labadieville, LA | 8 mi |
| 70339 | Pierre Part, LA | 9.2 mi |
| 70341 | Belle Rose, LA | 9.7 mi |
| 70380 | Morgan City, LA | 13 mi |
| 70086 | Saint James, LA | 13.1 mi |
| 70346 | Donaldsonville, LA | 15 mi |
| 70352 | Donner, LA | 15.2 mi |
| 70310 | Thibodaux, LA | 15.6 mi |
| 70340 | Amelia, LA | 15.8 mi |
| 70723 | Convent, LA | 16.7 mi |
Questions about 70390
What is the ZIP+4 code for 70390?
70390 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 70390, you need to look up a specific street address to get them.
What city is 70390?
70390 is assigned to Napoleonville, Louisiana, in Assumption 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.