ZIP Code 01571 — Dudley, MA
01571 is a standard (street delivery) ZIP code serving Dudley, 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 01571 at a glance
| ZIP code | 01571 |
|---|---|
| Primary city | Dudley |
| State | Massachusetts (MA) |
| County | Worcester FIPS 25027 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 11,929 |
| Coordinates | 42.055010, -71.935190 |
How ZIP+4 works in 01571
The four digits after the hyphen encode a delivery segment inside 01571. 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 01571 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 01571.
| ZIP | City | Distance |
|---|---|---|
| 06262 | Quinebaug, CT | 2.6 mi |
| 01570 | Webster, MA | 4.4 mi |
| 06255 | North Grosvenordale, CT | 4.9 mi |
| 01550 | Southbridge, MA | 5.1 mi |
| 01507 | Charlton, MA | 5.8 mi |
| 01540 | Oxford, MA | 5.8 mi |
| 06281 | Woodstock, CT | 7 mi |
| 06277 | Thompson, CT | 7.7 mi |
| 01537 | North Oxford, MA | 7.7 mi |
| 01566 | Sturbridge, MA | 8.1 mi |
| 01516 | Douglas, MA | 9.4 mi |
| 01518 | Fiskdale, MA | 10.1 mi |
Questions about 01571
What is the ZIP+4 code for 01571?
01571 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 01571, you need to look up a specific street address to get them.
What city is 01571?
01571 is assigned to Dudley, 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.