ZIP Code 62551 — Niantic, IL
62551 is a standard (street delivery) ZIP code serving Niantic, Illinois, in Macon 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 62551 at a glance
| ZIP code | 62551 |
|---|---|
| Primary city | Niantic |
| State | Illinois (IL) |
| County | Macon FIPS 17115 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 820 |
| Coordinates | 39.853570, -89.156310 |
How ZIP+4 works in 62551
The four digits after the hyphen encode a delivery segment inside 62551. 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 62551 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 62551.
| ZIP | City | Distance |
|---|---|---|
| 62537 | Harristown, IL | 3.3 mi |
| 62539 | Illiopolis, IL | 5 mi |
| 62522 | Decatur, IL | 6 mi |
| 62547 | Mount Auburn, IL | 7.6 mi |
| 62573 | Warrensburg, IL | 7.7 mi |
| 62543 | Latham, IL | 8.1 mi |
| 62514 | Boody, IL | 8.4 mi |
| 62513 | Blue Mound, IL | 9 mi |
| 62526 | Decatur, IL | 9.4 mi |
| 62523 | Decatur, IL | 10.8 mi |
| 62548 | Mount Pulaski, IL | 10.8 mi |
| 62532 | Elwin, IL | 10.9 mi |
Questions about 62551
What is the ZIP+4 code for 62551?
62551 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 62551, you need to look up a specific street address to get them.
What city is 62551?
62551 is assigned to Niantic, Illinois, in Macon 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.