ZIP Code 61378 — West Brooklyn, IL
61378 is a standard (street delivery) ZIP code serving West Brooklyn, 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 61378 at a glance
| ZIP code | 61378 |
|---|---|
| Primary city | West Brooklyn |
| State | Illinois (IL) |
| County | Lee FIPS 17103 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 513 |
| Coordinates | 41.726140, -89.158000 |
How ZIP+4 works in 61378
The four digits after the hyphen encode a delivery segment inside 61378. 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 61378 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 61378.
| ZIP | City | Distance |
|---|---|---|
| 61318 | Compton, IL | 4.1 mi |
| 61331 | Lee Center, IL | 6.3 mi |
| 61353 | Paw Paw, IL | 8.6 mi |
| 61367 | Sublette, IL | 8.7 mi |
| 60553 | Steward, IL | 9.5 mi |
| 61006 | Ashton, IL | 9.6 mi |
| 61310 | Amboy, IL | 10 mi |
| 61031 | Franklin Grove, IL | 11 mi |
| 60530 | Lee, IL | 11.3 mi |
| 61342 | Mendota, IL | 13.2 mi |
| 61324 | Eldena, IL | 13.5 mi |
| 61057 | Nachusa, IL | 13.8 mi |
Questions about 61378
What is the ZIP+4 code for 61378?
61378 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 61378, you need to look up a specific street address to get them.
What city is 61378?
61378 is assigned to West Brooklyn, 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.