ZIP Code 48860 — Muir, MI
48860 is a standard (street delivery) ZIP code serving Muir, Michigan, in Ionia 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 48860 at a glance
| ZIP code | 48860 |
|---|---|
| Primary city | Muir |
| State | Michigan (MI) |
| County | Ionia FIPS 26067 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 1,339 |
| Coordinates | 43.050890, -84.909390 |
How ZIP+4 works in 48860
The four digits after the hyphen encode a delivery segment inside 48860. 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 48860 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 48860.
| ZIP | City | Distance |
|---|---|---|
| 48873 | Pewamo, MI | 4.7 mi |
| 48845 | Hubbardston, MI | 4.8 mi |
| 48870 | Palo, MI | 5.6 mi |
| 48851 | Lyons, MI | 6.8 mi |
| 48834 | Fenwick, MI | 8.2 mi |
| 48835 | Fowler, MI | 8.3 mi |
| 48846 | Ionia, MI | 8.7 mi |
| 48811 | Carson City, MI | 9.5 mi |
| 48894 | Westphalia, MI | 10.2 mi |
| 48865 | Orleans, MI | 10.3 mi |
| 48853 | Maple Rapids, MI | 11.6 mi |
| 48884 | Sheridan, MI | 12.7 mi |
Questions about 48860
What is the ZIP+4 code for 48860?
48860 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 48860, you need to look up a specific street address to get them.
What city is 48860?
48860 is assigned to Muir, Michigan, in Ionia 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.