ZIP Code 48161 — Monroe, MI
48161 is a standard (street delivery) ZIP code serving Monroe, Michigan, in Monroe 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 48161 at a glance
| ZIP code | 48161 |
|---|---|
| Primary city | Monroe |
| State | Michigan (MI) |
| County | Monroe FIPS 26115 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 26,304 |
| Coordinates | 41.908180, -83.472630 |
How ZIP+4 works in 48161
The four digits after the hyphen encode a delivery segment inside 48161. 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 48161 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.
Other ZIP codes in Monroe
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 48161.
| ZIP | City | Distance |
|---|---|---|
| 48145 | La Salle, MI | 4 mi |
| 48162 | Monroe, MI | 4.1 mi |
| 48140 | Ida, MI | 5.9 mi |
| 48157 | Luna Pier, MI | 6.7 mi |
| 48133 | Erie, MI | 8.6 mi |
| 48177 | Samaria, MI | 9.1 mi |
| 48159 | Maybee, MI | 9.2 mi |
| 48182 | Temperance, MI | 9.7 mi |
| 48117 | Carleton, MI | 10.3 mi |
| 48166 | Newport, MI | 10.7 mi |
| 48131 | Dundee, MI | 11 mi |
| 49270 | Petersburg, MI | 11.1 mi |
Questions about 48161
What is the ZIP+4 code for 48161?
48161 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 48161, you need to look up a specific street address to get them.
What city is 48161?
48161 is assigned to Monroe, Michigan, in Monroe 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.