ZIP Code 49240 — Grass Lake, MI
49240 is a standard (street delivery) ZIP code serving Grass Lake, Michigan, in Jackson 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 49240 at a glance
| ZIP code | 49240 |
|---|---|
| Primary city | Grass Lake |
| State | Michigan (MI) |
| County | Jackson FIPS 26075 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 8,863 |
| Coordinates | 42.278210, -84.180270 |
How ZIP+4 works in 49240
The four digits after the hyphen encode a delivery segment inside 49240. 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 49240 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 49240.
| ZIP | City | Distance |
|---|---|---|
| 48118 | Chelsea, MI | 7.6 mi |
| 49254 | Michigan Center, MI | 8 mi |
| 49259 | Munith, MI | 8.1 mi |
| 49263 | Norvell, MI | 8.3 mi |
| 49261 | Napoleon, MI | 8.7 mi |
| 49201 | Jackson, MI | 10.5 mi |
| 48158 | Manchester, MI | 11.4 mi |
| 49272 | Pleasant Lake, MI | 11.7 mi |
| 49202 | Jackson, MI | 11.8 mi |
| 49203 | Jackson, MI | 12.1 mi |
| 49230 | Brooklyn, MI | 12.7 mi |
| 49285 | Stockbridge, MI | 13.2 mi |
Questions about 49240
What is the ZIP+4 code for 49240?
49240 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 49240, you need to look up a specific street address to get them.
What city is 49240?
49240 is assigned to Grass Lake, Michigan, in Jackson 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.