ZIP Code 61426 — Castleton, IL
61426 is a standard (street delivery) ZIP code serving Castleton, Illinois, in Stark 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 61426 at a glance
| ZIP code | 61426 |
|---|---|
| Primary city | Castleton |
| State | Illinois (IL) |
| County | Stark FIPS 17175 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 41 |
| Coordinates | 41.119640, -89.706010 |
How ZIP+4 works in 61426
The four digits after the hyphen encode a delivery segment inside 61426. 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 61426 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 61426.
| ZIP | City | Distance |
|---|---|---|
| 61491 | Wyoming, IL | 4.2 mi |
| 61424 | Camp Grove, IL | 4.7 mi |
| 61421 | Bradford, IL | 5 mi |
| 61479 | Speer, IL | 8.8 mi |
| 61483 | Toulon, IL | 9 mi |
| 61345 | Neponset, IL | 11.9 mi |
| 61565 | Sparland, IL | 12 mi |
| 61537 | Henry, IL | 12.3 mi |
| 61314 | Buda, IL | 12.4 mi |
| 61368 | Tiskilwa, IL | 13.7 mi |
| 61526 | Edelstein, IL | 13.8 mi |
| 61449 | La Fayette, IL | 13.9 mi |
Questions about 61426
What is the ZIP+4 code for 61426?
61426 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 61426, you need to look up a specific street address to get them.
What city is 61426?
61426 is assigned to Castleton, Illinois, in Stark 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.