ZIP Code 61233 — Andover, IL
61233 is a standard (street delivery) ZIP code serving Andover, Illinois, in Henry 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 61233 at a glance
| ZIP code | 61233 |
|---|---|
| Primary city | Andover |
| State | Illinois (IL) |
| County | Henry FIPS 17073 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 281 |
| Coordinates | 41.294640, -90.291290 |
How ZIP+4 works in 61233
The four digits after the hyphen encode a delivery segment inside 61233. 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 61233 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 61233.
| ZIP | City | Distance |
|---|---|---|
| 61262 | Lynn Center, IL | 3.6 mi |
| 61274 | Osco, IL | 5.3 mi |
| 61468 | Ophiem, IL | 5.6 mi |
| 61238 | Cambridge, IL | 6 mi |
| 61273 | Orion, IL | 7.4 mi |
| 61490 | Woodhull, IL | 7.8 mi |
| 61413 | Alpha, IL | 8.3 mi |
| 61465 | New Windsor, IL | 11 mi |
| 61419 | Bishop Hill, IL | 11.1 mi |
| 61240 | Coal Valley, IL | 11.6 mi |
| 61281 | Sherrard, IL | 11.9 mi |
| 61241 | Colona, IL | 13.4 mi |
Questions about 61233
What is the ZIP+4 code for 61233?
61233 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 61233, you need to look up a specific street address to get them.
What city is 61233?
61233 is assigned to Andover, Illinois, in Henry 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.