ZIP Code 61544 — London Mills, IL
61544 is a standard (street delivery) ZIP code serving London Mills, Illinois, in Fulton 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 61544 at a glance
| ZIP code | 61544 |
|---|---|
| Primary city | London Mills |
| State | Illinois (IL) |
| County | Fulton FIPS 17057 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 784 |
| Coordinates | 40.697530, -90.242730 |
How ZIP+4 works in 61544
The four digits after the hyphen encode a delivery segment inside 61544. 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 61544 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 61544.
| ZIP | City | Distance |
|---|---|---|
| 61432 | Fairview, IL | 5.4 mi |
| 61458 | Maquon, IL | 6.6 mi |
| 61431 | Ellisville, IL | 6.8 mi |
| 61474 | Saint Augustine, IL | 8.5 mi |
| 61415 | Avon, IL | 10.1 mi |
| 61433 | Fiatt, IL | 10.4 mi |
| 61531 | Farmington, IL | 10.9 mi |
| 61410 | Abingdon, IL | 11 mi |
| 61436 | Gilson, IL | 11.3 mi |
| 61553 | Norris, IL | 12.5 mi |
| 61572 | Yates City, IL | 12.9 mi |
| 61427 | Cuba, IL | 14 mi |
Questions about 61544
What is the ZIP+4 code for 61544?
61544 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 61544, you need to look up a specific street address to get them.
What city is 61544?
61544 is assigned to London Mills, Illinois, in Fulton 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.