ZIP Code 01521 — Holland, MA
01521 is a standard (street delivery) ZIP code serving Holland, Massachusetts, in Hampden 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 01521 at a glance
| ZIP code | 01521 |
|---|---|
| Primary city | Holland |
| State | Massachusetts (MA) |
| County | Hampden FIPS 25013 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,583 |
| Coordinates | 42.060120, -72.165920 |
How ZIP+4 works in 01521
The four digits after the hyphen encode a delivery segment inside 01521. 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 01521 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 01521.
| ZIP | City | Distance |
|---|---|---|
| 01081 | Wales, MA | 3.3 mi |
| 01518 | Fiskdale, MA | 4.5 mi |
| 01010 | Brimfield, MA | 5.2 mi |
| 01566 | Sturbridge, MA | 5.5 mi |
| 01550 | Southbridge, MA | 6.8 mi |
| 06076 | Stafford Springs, CT | 7 mi |
| 01057 | Monson, MA | 8.4 mi |
| 06282 | Woodstock Valley, CT | 9.1 mi |
| 01506 | Brookfield, MA | 9.7 mi |
| 06281 | Woodstock, CT | 9.8 mi |
| 01083 | Warren, MA | 10.2 mi |
| 01092 | West Warren, MA | 10.3 mi |
Questions about 01521
What is the ZIP+4 code for 01521?
01521 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 01521, you need to look up a specific street address to get them.
What city is 01521?
01521 is assigned to Holland, Massachusetts, in Hampden 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.