ZIP Code 61478 — Smithshire, IL
61478 is a standard (street delivery) ZIP code serving Smithshire, 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 61478 at a glance
| ZIP code | 61478 |
|---|---|
| Primary city | Smithshire |
| State | Illinois (IL) |
| County | Warren FIPS 17187 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 420 |
| Coordinates | 40.756330, -90.760350 |
How ZIP+4 works in 61478
The four digits after the hyphen encode a delivery segment inside 61478. 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 61478 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 61478.
| ZIP | City | Distance |
|---|---|---|
| 61460 | Media, IL | 4.3 mi |
| 61471 | Raritan, IL | 5.4 mi |
| 61473 | Roseville, IL | 6.6 mi |
| 61447 | Kirkwood, IL | 7.9 mi |
| 61418 | Biggsville, IL | 8.3 mi |
| 61480 | Stronghurst, IL | 8.6 mi |
| 61475 | Sciota, IL | 11 mi |
| 61417 | Berwick, IL | 11.4 mi |
| 61462 | Monmouth, IL | 12 mi |
| 61438 | Good Hope, IL | 13.1 mi |
| 61437 | Gladstone, IL | 13.6 mi |
| 61425 | Carman, IL | 14.9 mi |
Questions about 61478
What is the ZIP+4 code for 61478?
61478 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 61478, you need to look up a specific street address to get them.
What city is 61478?
61478 is assigned to Smithshire, 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.