ZIP Code 49270 — Petersburg, MI
49270 is a standard (street delivery) ZIP code serving Petersburg, 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 49270 at a glance
| ZIP code | 49270 |
|---|---|
| Primary city | Petersburg |
| State | Michigan (MI) |
| County | Monroe FIPS 26115 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 5,567 |
| Coordinates | 41.868640, -83.682060 |
How ZIP+4 works in 49270
The four digits after the hyphen encode a delivery segment inside 49270. 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 49270 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 49270.
| ZIP | City | Distance |
|---|---|---|
| 48140 | Ida, MI | 5.2 mi |
| 49238 | Deerfield, MI | 6 mi |
| 48131 | Dundee, MI | 6.7 mi |
| 48177 | Samaria, MI | 6.8 mi |
| 49276 | Riga, MI | 7.2 mi |
| 48182 | Temperance, MI | 7.5 mi |
| 49267 | Ottawa Lake, MI | 7.8 mi |
| 48144 | Lambertville, MI | 8.4 mi |
| 48161 | Monroe, MI | 11.1 mi |
| 49229 | Britton, MI | 11.2 mi |
| 49228 | Blissfield, MI | 11.2 mi |
| 48145 | La Salle, MI | 11.3 mi |
Questions about 49270
What is the ZIP+4 code for 49270?
49270 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 49270, you need to look up a specific street address to get them.
What city is 49270?
49270 is assigned to Petersburg, 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.