ZIP Code 62666 — Middletown, IL
62666 is a standard (street delivery) ZIP code serving Middletown, Illinois, in Logan 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 62666 at a glance
| ZIP code | 62666 |
|---|---|
| Primary city | Middletown |
| State | Illinois (IL) |
| County | Logan FIPS 17107 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 485 |
| Coordinates | 40.083840, -89.543640 |
How ZIP+4 works in 62666
The four digits after the hyphen encode a delivery segment inside 62666. 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 62666 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 62666.
| ZIP | City | Distance |
|---|---|---|
| 62671 | New Holland, IL | 5.8 mi |
| 62634 | Elkhart, IL | 6.7 mi |
| 62693 | Williamsville, IL | 8.8 mi |
| 62642 | Greenview, IL | 9 mi |
| 62613 | Athens, IL | 9.3 mi |
| 62656 | Lincoln, IL | 10.1 mi |
| 62643 | Hartsburg, IL | 11.8 mi |
| 62684 | Sherman, IL | 12.2 mi |
| 62541 | Lake Fork, IL | 12.7 mi |
| 62664 | Mason City, IL | 13 mi |
| 62519 | Cornland, IL | 13.3 mi |
| 62625 | Cantrall, IL | 14.9 mi |
Questions about 62666
What is the ZIP+4 code for 62666?
62666 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 62666, you need to look up a specific street address to get them.
What city is 62666?
62666 is assigned to Middletown, Illinois, in Logan 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.