ZIP Code 61031 — Franklin Grove, IL
61031 is a standard (street delivery) ZIP code serving Franklin Grove, Illinois, in Lee 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 61031 at a glance
| ZIP code | 61031 |
|---|---|
| Primary city | Franklin Grove |
| State | Illinois (IL) |
| County | Lee FIPS 17103 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,492 |
| Coordinates | 41.832630, -89.316260 |
How ZIP+4 works in 61031
The four digits after the hyphen encode a delivery segment inside 61031. 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 61031 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 61031.
| ZIP | City | Distance |
|---|---|---|
| 61057 | Nachusa, IL | 3.5 mi |
| 61006 | Ashton, IL | 5.9 mi |
| 61331 | Lee Center, IL | 6.2 mi |
| 61324 | Eldena, IL | 6.6 mi |
| 61021 | Dixon, IL | 8.3 mi |
| 61310 | Amboy, IL | 9.4 mi |
| 61378 | West Brooklyn, IL | 11 mi |
| 61061 | Oregon, IL | 11.5 mi |
| 61015 | Chana, IL | 12.7 mi |
| 61091 | Woosung, IL | 13.2 mi |
| 61367 | Sublette, IL | 14.5 mi |
| 61318 | Compton, IL | 14.7 mi |
Questions about 61031
What is the ZIP+4 code for 61031?
61031 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 61031, you need to look up a specific street address to get them.
What city is 61031?
61031 is assigned to Franklin Grove, Illinois, in Lee 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.