ZIP Code 01504 — Blackstone, MA
01504 is a standard (street delivery) ZIP code serving Blackstone, Massachusetts, in Worcester 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 01504 at a glance
| ZIP code | 01504 |
|---|---|
| Primary city | Blackstone |
| State | Massachusetts (MA) |
| County | Worcester FIPS 25027 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 9,255 |
| Coordinates | 42.039900, -71.531250 |
How ZIP+4 works in 01504
The four digits after the hyphen encode a delivery segment inside 01504. 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 01504 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 01504.
| ZIP | City | Distance |
|---|---|---|
| 01529 | Millville, MA | 2.4 mi |
| 02895 | Woonsocket, RI | 3.1 mi |
| 02824 | Forestdale, RI | 3.2 mi |
| 01756 | Mendon, MA | 3.8 mi |
| 02876 | Slatersville, RI | 3.9 mi |
| 02019 | Bellingham, MA | 3.9 mi |
| 02896 | North Smithfield, RI | 4.7 mi |
| 01569 | Uxbridge, MA | 5.6 mi |
| 01747 | Hopedale, MA | 5.9 mi |
| 02838 | Manville, RI | 5.9 mi |
| 02038 | Franklin, MA | 6.9 mi |
| 01525 | Linwood, MA | 7 mi |
Questions about 01504
What is the ZIP+4 code for 01504?
01504 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 01504, you need to look up a specific street address to get them.
What city is 01504?
01504 is assigned to Blackstone, Massachusetts, in Worcester 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.