ZIP Code 00631 — Castaner, PR
00631 is a standard (street delivery) ZIP code serving Castaner, Puerto Rico, in Lares 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 00631 at a glance
| ZIP code | 00631 |
|---|---|
| Primary city | Castaner |
| State | Puerto Rico (PR) |
| County | Lares FIPS 72081 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Puerto_Rico |
| Population | 1,321 |
| Coordinates | 18.185200, -66.831690 |
How ZIP+4 works in 00631
The four digits after the hyphen encode a delivery segment inside 00631. 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 00631 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 00631.
| ZIP | City | Distance |
|---|---|---|
| 00601 | Adjuntas, PR | 5.2 mi |
| 00669 | Lares, PR | 6.3 mi |
| 00611 | Angeles, PR | 6.5 mi |
| 00606 | Maricao, PR | 7 mi |
| 00698 | Yauco, PR | 7.9 mi |
| 00641 | Utuado, PR | 10.2 mi |
| 00656 | Guayanilla, PR | 10.2 mi |
| 00637 | Sabana Grande, PR | 10.4 mi |
| 00670 | Las Marias, PR | 10.9 mi |
| 00624 | Penuelas, PR | 11.4 mi |
| 00653 | Guanica, PR | 14 mi |
| 00685 | San Sebastian, PR | 14.1 mi |
Questions about 00631
What is the ZIP+4 code for 00631?
00631 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 00631, you need to look up a specific street address to get them.
What city is 00631?
00631 is assigned to Castaner, Puerto Rico, in Lares 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.