ZIP Code 61065 — Poplar Grove, IL
61065 is a standard (street delivery) ZIP code serving Poplar Grove, Illinois, in Boone 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 61065 at a glance
| ZIP code | 61065 |
|---|---|
| Primary city | Poplar Grove |
| State | Illinois (IL) |
| County | Boone FIPS 17007 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 10,570 |
| Coordinates | 42.407860, -88.827470 |
How ZIP+4 works in 61065
The four digits after the hyphen encode a delivery segment inside 61065. 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 61065 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 61065.
| ZIP | City | Distance |
|---|---|---|
| 61012 | Capron, IL | 3.7 mi |
| 61011 | Caledonia, IL | 4.5 mi |
| 61073 | Roscoe, IL | 8.5 mi |
| 53525 | Clinton, WI | 9.6 mi |
| 61080 | South Beloit, IL | 9.7 mi |
| 53585 | Sharon, WI | 10.1 mi |
| 61111 | Loves Park, IL | 10.3 mi |
| 61114 | Rockford, IL | 10.7 mi |
| 61115 | Machesney Park, IL | 10.7 mi |
| 61038 | Garden Prairie, IL | 11 mi |
| 60033 | Harvard, IL | 11.1 mi |
| 61008 | Belvidere, IL | 11.2 mi |
Questions about 61065
What is the ZIP+4 code for 61065?
61065 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 61065, you need to look up a specific street address to get them.
What city is 61065?
61065 is assigned to Poplar Grove, Illinois, in Boone 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.