ZIP Code 61721 — Armington, IL
61721 is a standard (street delivery) ZIP code serving Armington, Illinois, in Tazewell 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 61721 at a glance
| ZIP code | 61721 |
|---|---|
| Primary city | Armington |
| State | Illinois (IL) |
| County | Tazewell FIPS 17179 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 552 |
| Coordinates | 40.353490, -89.322380 |
How ZIP+4 works in 61721
The four digits after the hyphen encode a delivery segment inside 61721. 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 61721 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 61721.
| ZIP | City | Distance |
|---|---|---|
| 61759 | Minier, IL | 5.6 mi |
| 61723 | Atlanta, IL | 7 mi |
| 61747 | Hopedale, IL | 7.3 mi |
| 61774 | Stanford, IL | 8.2 mi |
| 62635 | Emden, IL | 8.5 mi |
| 61754 | Mclean, IL | 8.8 mi |
| 61751 | Lawndale, IL | 9.7 mi |
| 62643 | Hartsburg, IL | 10.5 mi |
| 61734 | Delavan, IL | 10.8 mi |
| 61755 | Mackinaw, IL | 12 mi |
| 61568 | Tremont, IL | 13.3 mi |
| 61732 | Danvers, IL | 13.7 mi |
Questions about 61721
What is the ZIP+4 code for 61721?
61721 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 61721, you need to look up a specific street address to get them.
What city is 61721?
61721 is assigned to Armington, Illinois, in Tazewell 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.