ZIP Code 61810 — Allerton, IL
61810 is a standard (street delivery) ZIP code serving Allerton, Illinois, in Vermilion 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 61810 at a glance
| ZIP code | 61810 |
|---|---|
| Primary city | Allerton |
| State | Illinois (IL) |
| County | Vermilion FIPS 17183 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 265 |
| Coordinates | 39.910190, -87.918370 |
How ZIP+4 works in 61810
The four digits after the hyphen encode a delivery segment inside 61810. 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 61810 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 61810.
| ZIP | City | Distance |
|---|---|---|
| 61876 | Sidell, IL | 4.2 mi |
| 61816 | Broadlands, IL | 4.6 mi |
| 61849 | Homer, IL | 7.4 mi |
| 61932 | Hume, IL | 8 mi |
| 61942 | Newman, IL | 8.1 mi |
| 61852 | Longview, IL | 8.2 mi |
| 61940 | Metcalf, IL | 9.2 mi |
| 61850 | Indianola, IL | 9.4 mi |
| 61841 | Fairmount, IL | 9.5 mi |
| 61877 | Sidney, IL | 10.2 mi |
| 61941 | Murdock, IL | 11 mi |
| 61956 | Villa Grove, IL | 12.6 mi |
Questions about 61810
What is the ZIP+4 code for 61810?
61810 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 61810, you need to look up a specific street address to get them.
What city is 61810?
61810 is assigned to Allerton, Illinois, in Vermilion 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.