ZIP Code 01432 — Ayer, MA
01432 is a standard (street delivery) ZIP code serving Ayer, 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 01432 at a glance
| ZIP code | 01432 |
|---|---|
| Primary city | Ayer |
| State | Massachusetts (MA) |
| County | Middlesex FIPS 25017 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 8,521 |
| Coordinates | 42.563510, -71.570590 |
How ZIP+4 works in 01432
The four digits after the hyphen encode a delivery segment inside 01432. 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 01432 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 01432.
| ZIP | City | Distance |
|---|---|---|
| 01434 | Devens, MA | 3.2 mi |
| 01450 | Groton, MA | 3.5 mi |
| 01464 | Shirley, MA | 4 mi |
| 01451 | Harvard, MA | 4.4 mi |
| 01460 | Littleton, MA | 4.6 mi |
| 01719 | Boxborough, MA | 5.8 mi |
| 01886 | Westford, MA | 6.8 mi |
| 01463 | Pepperell, MA | 7.6 mi |
| 01718 | Acton, MA | 7.7 mi |
| 01462 | Lunenburg, MA | 7.8 mi |
| 01523 | Lancaster, MA | 7.9 mi |
| 01827 | Dunstable, MA | 8.6 mi |
Questions about 01432
What is the ZIP+4 code for 01432?
01432 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 01432, you need to look up a specific street address to get them.
What city is 01432?
01432 is assigned to Ayer, 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.