ZIP Code 61070 — Rock City, IL
61070 is a standard (street delivery) ZIP code serving Rock City, Illinois, in Stephenson 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 61070 at a glance
| ZIP code | 61070 |
|---|---|
| Primary city | Rock City |
| State | Illinois (IL) |
| County | Stephenson FIPS 17177 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,322 |
| Coordinates | 42.415710, -89.471770 |
How ZIP+4 works in 61070
The four digits after the hyphen encode a delivery segment inside 61070. 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 61070 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 61070.
| ZIP | City | Distance |
|---|---|---|
| 61019 | Davis, IL | 3.7 mi |
| 61018 | Dakota, IL | 4.3 mi |
| 61067 | Ridott, IL | 7.7 mi |
| 61060 | Orangeville, IL | 8.6 mi |
| 61013 | Cedarville, IL | 8.8 mi |
| 61024 | Durand, IL | 9.3 mi |
| 61063 | Pecatonica, IL | 9.5 mi |
| 53550 | Juda, WI | 9.9 mi |
| 61032 | Freeport, IL | 10.9 mi |
| 61050 | Mcconnell, IL | 13.4 mi |
| 61079 | Shirland, IL | 13.5 mi |
| 61077 | Seward, IL | 13.7 mi |
Questions about 61070
What is the ZIP+4 code for 61070?
61070 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 61070, you need to look up a specific street address to get them.
What city is 61070?
61070 is assigned to Rock City, Illinois, in Stephenson 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.