ZIP Code 61010 — Byron, IL
61010 is a standard (street delivery) ZIP code serving Byron, Illinois, in Ogle 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 61010 at a glance
| ZIP code | 61010 |
|---|---|
| Primary city | Byron |
| State | Illinois (IL) |
| County | Ogle FIPS 17141 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 7,497 |
| Coordinates | 42.136000, -89.267510 |
How ZIP+4 works in 61010
The four digits after the hyphen encode a delivery segment inside 61010. 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 61010 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 61010.
| ZIP | City | Distance |
|---|---|---|
| 61084 | Stillman Valley, IL | 4.2 mi |
| 61047 | Leaf River, IL | 6.7 mi |
| 61077 | Seward, IL | 8.3 mi |
| 61102 | Rockford, IL | 8.6 mi |
| 61020 | Davis Junction, IL | 8.8 mi |
| 61088 | Winnebago, IL | 9.3 mi |
| 61043 | Holcomb, IL | 9.6 mi |
| 61061 | Oregon, IL | 10.2 mi |
| 61015 | Chana, IL | 10.4 mi |
| 61054 | Mount Morris, IL | 10.7 mi |
| 61039 | German Valley, IL | 11.5 mi |
| 61109 | Rockford, IL | 11.6 mi |
Questions about 61010
What is the ZIP+4 code for 61010?
61010 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 61010, you need to look up a specific street address to get them.
What city is 61010?
61010 is assigned to Byron, Illinois, in Ogle 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.