ZIP Code 62943 — Grantsburg, IL
62943 is a standard (street delivery) ZIP code serving Grantsburg, Illinois, in Johnson 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 62943 at a glance
| ZIP code | 62943 |
|---|---|
| Primary city | Grantsburg |
| State | Illinois (IL) |
| County | Johnson FIPS 17087 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 428 |
| Coordinates | 37.355860, -88.746690 |
How ZIP+4 works in 62943
The four digits after the hyphen encode a delivery segment inside 62943. 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 62943 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 62943.
| ZIP | City | Distance |
|---|---|---|
| 62908 | Belknap, IL | 7.3 mi |
| 62985 | Simpson, IL | 8.3 mi |
| 62995 | Vienna, IL | 8.6 mi |
| 62960 | Metropolis, IL | 9.2 mi |
| 62938 | Golconda, IL | 11.1 mi |
| 62956 | Karnak, IL | 11.5 mi |
| 62953 | Joppa, IL | 11.6 mi |
| 62928 | Eddyville, IL | 13 mi |
| 62972 | Ozark, IL | 13.4 mi |
| 62941 | Grand Chain, IL | 14.7 mi |
| 62967 | New Burnside, IL | 15.5 mi |
| 62923 | Cypress, IL | 16 mi |
Questions about 62943
What is the ZIP+4 code for 62943?
62943 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 62943, you need to look up a specific street address to get them.
What city is 62943?
62943 is assigned to Grantsburg, Illinois, in Johnson 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.