ZIP Code 61856 — Monticello, IL
61856 is a standard (street delivery) ZIP code serving Monticello, Illinois, in Piatt 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 61856 at a glance
| ZIP code | 61856 |
|---|---|
| Primary city | Monticello |
| State | Illinois (IL) |
| County | Piatt FIPS 17147 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 8,226 |
| Coordinates | 40.028380, -88.582110 |
How ZIP+4 works in 61856
The four digits after the hyphen encode a delivery segment inside 61856. 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 61856 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 61856.
| ZIP | City | Distance |
|---|---|---|
| 61884 | White Heath, IL | 6.8 mi |
| 61839 | De Land, IL | 7.7 mi |
| 61830 | Cisco, IL | 7.9 mi |
| 61855 | Milmine, IL | 8.3 mi |
| 61813 | Bement, IL | 8.3 mi |
| 61851 | Ivesdale, IL | 8.9 mi |
| 61875 | Seymour, IL | 9.9 mi |
| 61882 | Weldon, IL | 11 mi |
| 61818 | Cerro Gordo, IL | 12.2 mi |
| 61872 | Sadorus, IL | 12.4 mi |
| 61815 | Bondville, IL | 12.7 mi |
| 61854 | Mansfield, IL | 12.7 mi |
Questions about 61856
What is the ZIP+4 code for 61856?
61856 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 61856, you need to look up a specific street address to get them.
What city is 61856?
61856 is assigned to Monticello, Illinois, in Piatt 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.