ZIP Code 61285 — Thomson, IL
61285 is a standard (street delivery) ZIP code serving Thomson, Illinois, in Carroll 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 61285 at a glance
| ZIP code | 61285 |
|---|---|
| Primary city | Thomson |
| State | Illinois (IL) |
| County | Carroll FIPS 17015 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 2,728 |
| Coordinates | 41.983070, -90.081100 |
How ZIP+4 works in 61285
The four digits after the hyphen encode a delivery segment inside 61285. 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 61285 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 61285.
| ZIP | City | Distance |
|---|---|---|
| 52701 | Andover, IA | 8.6 mi |
| 52771 | Teeds Grove, IA | 9.4 mi |
| 52070 | Sabula, IA | 9.8 mi |
| 61252 | Fulton, IL | 9.9 mi |
| 61014 | Chadwick, IL | 10 mi |
| 61074 | Savanna, IL | 10.2 mi |
| 61053 | Mount Carroll, IL | 10.4 mi |
| 52732 | Clinton, IA | 10.4 mi |
| 61270 | Morrison, IL | 12.1 mi |
| 52727 | Bryant, IA | 13.1 mi |
| 52064 | Miles, IA | 13.9 mi |
| 61046 | Lanark, IL | 16.1 mi |
Questions about 61285
What is the ZIP+4 code for 61285?
61285 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 61285, you need to look up a specific street address to get them.
What city is 61285?
61285 is assigned to Thomson, Illinois, in Carroll 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.