ZIP Code 48166 — Newport, MI
48166 is a standard (street delivery) ZIP code serving Newport, 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 48166 at a glance
| ZIP code | 48166 |
|---|---|
| Primary city | Newport |
| State | Michigan (MI) |
| County | Monroe FIPS 26115 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 14,056 |
| Coordinates | 41.986770, -83.293750 |
How ZIP+4 works in 48166
The four digits after the hyphen encode a delivery segment inside 48166. 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 48166 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 48166.
| ZIP | City | Distance |
|---|---|---|
| 48179 | South Rockwood, MI | 4 mi |
| 48117 | Carleton, MI | 7.4 mi |
| 48173 | Rockwood, MI | 7.4 mi |
| 48162 | Monroe, MI | 7.5 mi |
| 48134 | Flat Rock, MI | 8.4 mi |
| 48161 | Monroe, MI | 10.7 mi |
| 48164 | New Boston, MI | 10.9 mi |
| 48183 | Trenton, MI | 11 mi |
| 48138 | Grosse Ile, MI | 12.2 mi |
| 48145 | La Salle, MI | 12.8 mi |
| 48193 | Riverview, MI | 13.6 mi |
| 48159 | Maybee, MI | 13.7 mi |
Questions about 48166
What is the ZIP+4 code for 48166?
48166 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 48166, you need to look up a specific street address to get them.
What city is 48166?
48166 is assigned to Newport, 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.