ZIP Code 61323 — Dover, IL
61323 is a standard (street delivery) ZIP code serving Dover, Illinois, in Bureau 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 61323 at a glance
| ZIP code | 61323 |
|---|---|
| Primary city | Dover |
| State | Illinois (IL) |
| County | Bureau FIPS 17011 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 125 |
| Coordinates | 41.435440, -89.396050 |
How ZIP+4 works in 61323
The four digits after the hyphen encode a delivery segment inside 61323. 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 61323 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 61323.
| ZIP | City | Distance |
|---|---|---|
| 61356 | Princeton, IL | 3.8 mi |
| 61337 | Malden, IL | 4.1 mi |
| 61328 | Kasbeer, IL | 6 mi |
| 61374 | Van Orin, IL | 8 mi |
| 61359 | Seatonville, IL | 8.2 mi |
| 61349 | Ohio, IL | 8.4 mi |
| 61312 | Arlington, IL | 8.8 mi |
| 61322 | Depue, IL | 9.3 mi |
| 61330 | La Moille, IL | 9.3 mi |
| 61317 | Cherry, IL | 9.7 mi |
| 61362 | Spring Valley, IL | 10.4 mi |
| 61315 | Bureau, IL | 10.4 mi |
Questions about 61323
What is the ZIP+4 code for 61323?
61323 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 61323, you need to look up a specific street address to get them.
What city is 61323?
61323 is assigned to Dover, Illinois, in Bureau 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.