ZIP Code 48637 — Merrill, MI
48637 is a standard (street delivery) ZIP code serving Merrill, Michigan, in Saginaw 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 48637 at a glance
| ZIP code | 48637 |
|---|---|
| Primary city | Merrill |
| State | Michigan (MI) |
| County | Saginaw FIPS 26145 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 3,024 |
| Coordinates | 43.414990, -84.336460 |
How ZIP+4 works in 48637
The four digits after the hyphen encode a delivery segment inside 48637. 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 48637 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 48637.
| ZIP | City | Distance |
|---|---|---|
| 48662 | Wheeler, MI | 3.8 mi |
| 48626 | Hemlock, MI | 5.5 mi |
| 48615 | Breckenridge, MI | 6.9 mi |
| 48614 | Brant, MI | 11.5 mi |
| 48640 | Midland, MI | 11.7 mi |
| 48880 | Saint Louis, MI | 12.1 mi |
| 48623 | Freeland, MI | 12.4 mi |
| 48655 | Saint Charles, MI | 12.4 mi |
| 48609 | Saginaw, MI | 12.6 mi |
| 48862 | North Star, MI | 15.6 mi |
| 48847 | Ithaca, MI | 15.6 mi |
| 48603 | Saginaw, MI | 15.7 mi |
Questions about 48637
What is the ZIP+4 code for 48637?
48637 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 48637, you need to look up a specific street address to get them.
What city is 48637?
48637 is assigned to Merrill, Michigan, in Saginaw 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.