ZIP Code 01731 — Hanscom Afb, MA
01731 is a standard (street delivery) ZIP code serving Hanscom Afb, Massachusetts, in Middlesex 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 01731 at a glance
| ZIP code | 01731 |
|---|---|
| Primary city | Hanscom Afb |
| State | Massachusetts (MA) |
| County | Middlesex FIPS 25017 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,110 |
| Coordinates | 42.464220, -71.282020 |
How ZIP+4 works in 01731
The four digits after the hyphen encode a delivery segment inside 01731. 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 01731 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 01731.
| ZIP | City | Distance |
|---|---|---|
| 01730 | Bedford, MA | 2.4 mi |
| 02421 | Lexington, MA | 2.8 mi |
| 01773 | Lincoln, MA | 3 mi |
| 02420 | Lexington, MA | 3.3 mi |
| 01742 | Concord, MA | 4.2 mi |
| 02451 | Waltham, MA | 4.7 mi |
| 01803 | Burlington, MA | 4.9 mi |
| 01741 | Carlisle, MA | 5.7 mi |
| 02452 | Waltham, MA | 5.8 mi |
| 01821 | Billerica, MA | 6.1 mi |
| 02476 | Arlington, MA | 6.4 mi |
| 01801 | Woburn, MA | 6.7 mi |
Questions about 01731
What is the ZIP+4 code for 01731?
01731 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 01731, you need to look up a specific street address to get them.
What city is 01731?
01731 is assigned to Hanscom Afb, Massachusetts, in Middlesex 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.