ZIP Code 55811 — Duluth, MN
55811 is a standard (street delivery) ZIP code serving Duluth, Minnesota, in St. Louis 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 55811 at a glance
| ZIP code | 55811 |
|---|---|
| Primary city | Duluth |
| State | Minnesota (MN) |
| County | St. Louis FIPS 27137 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 28,118 |
| Coordinates | 46.837670, -92.219930 |
How ZIP+4 works in 55811
The four digits after the hyphen encode a delivery segment inside 55811. 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 55811 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 Duluth
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 55811.
| ZIP | City | Distance |
|---|---|---|
| 55814 | Duluth, MN | 1.1 mi |
| 55810 | Duluth, MN | 6 mi |
| 55805 | Duluth, MN | 6.4 mi |
| 55806 | Duluth, MN | 6.5 mi |
| 55812 | Duluth, MN | 7 mi |
| 55807 | Duluth, MN | 7.5 mi |
| 55802 | Duluth, MN | 8.8 mi |
| 55808 | Duluth, MN | 11 mi |
| 55733 | Esko, MN | 11 mi |
| 55779 | Saginaw, MN | 12.1 mi |
| 55803 | Duluth, MN | 15.3 mi |
| 55804 | Duluth, MN | 15.3 mi |
Questions about 55811
What is the ZIP+4 code for 55811?
55811 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 55811, you need to look up a specific street address to get them.
What city is 55811?
55811 is assigned to Duluth, Minnesota, in St. Louis 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.