ZIP Code 61540 — Lacon, IL
61540 is a standard (street delivery) ZIP code serving Lacon, Illinois, in Marshall 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 61540 at a glance
| ZIP code | 61540 |
|---|---|
| Primary city | Lacon |
| State | Illinois (IL) |
| County | Marshall FIPS 17123 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 2,753 |
| Coordinates | 41.018560, -89.368670 |
How ZIP+4 works in 61540
The four digits after the hyphen encode a delivery segment inside 61540. 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 61540 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 61540.
| ZIP | City | Distance |
|---|---|---|
| 61375 | Varna, IL | 6.4 mi |
| 61565 | Sparland, IL | 7.3 mi |
| 61570 | Washburn, IL | 7.4 mi |
| 61541 | La Rose, IL | 7.4 mi |
| 61537 | Henry, IL | 8.6 mi |
| 61336 | Magnolia, IL | 10 mi |
| 61545 | Lowpoint, IL | 10.4 mi |
| 61523 | Chillicothe, IL | 11.1 mi |
| 61369 | Toluca, IL | 11.4 mi |
| 61560 | Putnam, IL | 11.7 mi |
| 61562 | Rome, IL | 11.7 mi |
| 61335 | Mcnabb, IL | 12.1 mi |
Questions about 61540
What is the ZIP+4 code for 61540?
61540 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 61540, you need to look up a specific street address to get them.
What city is 61540?
61540 is assigned to Lacon, Illinois, in Marshall 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.