ZIP Code 61257 — Hillsdale, IL
61257 is a standard (street delivery) ZIP code serving Hillsdale, Illinois, in Rock Island 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 61257 at a glance
| ZIP code | 61257 |
|---|---|
| Primary city | Hillsdale |
| State | Illinois (IL) |
| County | Rock Island FIPS 17161 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 844 |
| Coordinates | 41.590250, -90.223220 |
How ZIP+4 works in 61257
The four digits after the hyphen encode a delivery segment inside 61257. 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 61257 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 61257.
| ZIP | City | Distance |
|---|---|---|
| 61275 | Port Byron, IL | 3.9 mi |
| 61278 | Rapids City, IL | 6.1 mi |
| 61250 | Erie, IL | 7.9 mi |
| 61242 | Cordova, IL | 8.3 mi |
| 61236 | Barstow, IL | 8.7 mi |
| 61241 | Colona, IL | 8.7 mi |
| 52753 | Le Claire, IA | 8.9 mi |
| 61254 | Geneseo, IL | 9.2 mi |
| 61256 | Hampton, IL | 9.4 mi |
| 61244 | East Moline, IL | 10 mi |
| 52767 | Pleasant Valley, IA | 10.4 mi |
| 61230 | Albany, IL | 10.4 mi |
Questions about 61257
What is the ZIP+4 code for 61257?
61257 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 61257, you need to look up a specific street address to get them.
What city is 61257?
61257 is assigned to Hillsdale, Illinois, in Rock Island 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.