ZIP Code 61435 — Gerlaw, IL
61435 is a standard (street delivery) ZIP code serving Gerlaw, Illinois, in Warren 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 61435 at a glance
| ZIP code | 61435 |
|---|---|
| Primary city | Gerlaw |
| State | Illinois (IL) |
| County | Warren FIPS 17187 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 271 |
| Coordinates | 40.995590, -90.568600 |
How ZIP+4 works in 61435
The four digits after the hyphen encode a delivery segment inside 61435. 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 61435 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 61435.
| ZIP | City | Distance |
|---|---|---|
| 61412 | Alexis, IL | 5.3 mi |
| 61462 | Monmouth, IL | 7.3 mi |
| 61423 | Cameron, IL | 8.3 mi |
| 61466 | North Henderson, IL | 9.1 mi |
| 61402 | Galesburg, IL | 9.3 mi |
| 61401 | Galesburg, IL | 10 mi |
| 61453 | Little York, IL | 10.2 mi |
| 61439 | Henderson, IL | 11.6 mi |
| 61472 | Rio, IL | 12.2 mi |
| 61488 | Wataga, IL | 13.1 mi |
| 61447 | Kirkwood, IL | 13.4 mi |
| 61486 | Viola, IL | 13.8 mi |
Questions about 61435
What is the ZIP+4 code for 61435?
61435 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 61435, you need to look up a specific street address to get them.
What city is 61435?
61435 is assigned to Gerlaw, Illinois, in Warren 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.