ZIP Code 61866 — Rantoul, IL
61866 is a standard (street delivery) ZIP code serving Rantoul, Illinois, in Champaign 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 61866 at a glance
| ZIP code | 61866 |
|---|---|
| Primary city | Rantoul |
| State | Illinois (IL) |
| County | Champaign FIPS 17019 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 13,470 |
| Coordinates | 40.311480, -88.158370 |
How ZIP+4 works in 61866
The four digits after the hyphen encode a delivery segment inside 61866. 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 61866 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 61866.
| ZIP | City | Distance |
|---|---|---|
| 61878 | Thomasboro, IL | 5 mi |
| 60949 | Ludlow, IL | 5.6 mi |
| 61847 | Gifford, IL | 7.5 mi |
| 61840 | Dewey, IL | 7.6 mi |
| 60957 | Paxton, IL | 8.9 mi |
| 61862 | Penfield, IL | 10.9 mi |
| 61843 | Fisher, IL | 11.7 mi |
| 60933 | Elliott, IL | 12.1 mi |
| 61871 | Royal, IL | 12.6 mi |
| 61802 | Urbana, IL | 13 mi |
| 61873 | Saint Joseph, IL | 13.4 mi |
| 61845 | Foosland, IL | 13.4 mi |
Questions about 61866
What is the ZIP+4 code for 61866?
61866 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 61866, you need to look up a specific street address to get them.
What city is 61866?
61866 is assigned to Rantoul, Illinois, in Champaign 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.