ZIP Code 49128 — Three Oaks, MI
49128 is a standard (street delivery) ZIP code serving Three Oaks, Michigan, in Berrien 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 49128 at a glance
| ZIP code | 49128 |
|---|---|
| Primary city | Three Oaks |
| State | Michigan (MI) |
| County | Berrien FIPS 26021 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 3,450 |
| Coordinates | 41.817060, -86.604570 |
How ZIP+4 works in 49128
The four digits after the hyphen encode a delivery segment inside 49128. 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 49128 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 49128.
| ZIP | City | Distance |
|---|---|---|
| 49116 | Lakeside, MI | 3.8 mi |
| 49115 | Harbert, MI | 4.3 mi |
| 49129 | Union Pier, MI | 4.3 mi |
| 49119 | New Troy, MI | 5 mi |
| 49125 | Sawyer, MI | 5 mi |
| 49113 | Galien, MI | 5.4 mi |
| 49117 | New Buffalo, MI | 6.8 mi |
| 49106 | Bridgman, MI | 8.6 mi |
| 46371 | Rolling Prairie, IN | 9.7 mi |
| 46552 | New Carlisle, IN | 9.8 mi |
| 49107 | Buchanan, MI | 10 mi |
| 49101 | Baroda, MI | 10.8 mi |
Questions about 49128
What is the ZIP+4 code for 49128?
49128 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 49128, you need to look up a specific street address to get them.
What city is 49128?
49128 is assigned to Three Oaks, Michigan, in Berrien 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.