ZIP Code 01921 — Boxford, MA
01921 is a standard (street delivery) ZIP code serving Boxford, Massachusetts, in Essex 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 01921 at a glance
| ZIP code | 01921 |
|---|---|
| Primary city | Boxford |
| State | Massachusetts (MA) |
| County | Essex FIPS 25009 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 8,250 |
| Coordinates | 42.681500, -71.018870 |
How ZIP+4 works in 01921
The four digits after the hyphen encode a delivery segment inside 01921. 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 01921 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 01921.
| ZIP | City | Distance |
|---|---|---|
| 01845 | North Andover, MA | 3.5 mi |
| 01833 | Georgetown, MA | 3.5 mi |
| 01834 | Groveland, MA | 4.9 mi |
| 01983 | Topsfield, MA | 4.9 mi |
| 01949 | Middleton, MA | 5.3 mi |
| 01835 | Haverhill, MA | 6 mi |
| 01937 | Hathorne, MA | 6.8 mi |
| 01969 | Rowley, MA | 7.2 mi |
| 01843 | Lawrence, MA | 7.2 mi |
| 01840 | Lawrence, MA | 7.4 mi |
| 01922 | Byfield, MA | 7.4 mi |
| 01841 | Lawrence, MA | 7.7 mi |
Questions about 01921
What is the ZIP+4 code for 01921?
01921 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 01921, you need to look up a specific street address to get them.
What city is 01921?
01921 is assigned to Boxford, Massachusetts, in Essex 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.