ZIP Code 48840 — Haslett, MI
48840 is a standard (street delivery) ZIP code serving Haslett, Michigan, in Ingham 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 48840 at a glance
| ZIP code | 48840 |
|---|---|
| Primary city | Haslett |
| State | Michigan (MI) |
| County | Ingham FIPS 26065 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 12,386 |
| Coordinates | 42.766850, -84.370710 |
How ZIP+4 works in 48840
The four digits after the hyphen encode a delivery segment inside 48840. 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 48840 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 48840.
| ZIP | City | Distance |
|---|---|---|
| 48823 | East Lansing, MI | 4.2 mi |
| 48864 | Okemos, MI | 4.9 mi |
| 48808 | Bath, MI | 5.8 mi |
| 48824 | East Lansing, MI | 6.2 mi |
| 48825 | East Lansing, MI | 6.2 mi |
| 48895 | Williamston, MI | 7 mi |
| 48912 | Lansing, MI | 8 mi |
| 48872 | Perry, MI | 8 mi |
| 48848 | Laingsburg, MI | 8.2 mi |
| 48910 | Lansing, MI | 9.2 mi |
| 48933 | Lansing, MI | 9.7 mi |
| 48915 | Lansing, MI | 10.3 mi |
Questions about 48840
What is the ZIP+4 code for 48840?
48840 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 48840, you need to look up a specific street address to get them.
What city is 48840?
48840 is assigned to Haslett, Michigan, in Ingham 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.