ZIP Code 62837 — Fairfield, IL
62837 is a standard (street delivery) ZIP code serving Fairfield, Illinois, in Wayne 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 62837 at a glance
| ZIP code | 62837 |
|---|---|
| Primary city | Fairfield |
| State | Illinois (IL) |
| County | Wayne FIPS 17191 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 7,868 |
| Coordinates | 38.366080, -88.359990 |
How ZIP+4 works in 62837
The four digits after the hyphen encode a delivery segment inside 62837. 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 62837 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 62837.
| ZIP | City | Distance |
|---|---|---|
| 62809 | Barnhill, IL | 6 mi |
| 62842 | Geff, IL | 7.3 mi |
| 62843 | Golden Gate, IL | 8.8 mi |
| 62886 | Sims, IL | 9.5 mi |
| 62820 | Burnt Prairie, IL | 10.5 mi |
| 62833 | Ellery, IL | 10.8 mi |
| 62862 | Mill Shoals, IL | 10.9 mi |
| 62895 | Wayne City, IL | 11 mi |
| 62823 | Cisne, IL | 11.3 mi |
| 62446 | Mount Erie, IL | 11.7 mi |
| 62887 | Springerton, IL | 12.5 mi |
| 62850 | Johnsonville, IL | 15.2 mi |
Questions about 62837
What is the ZIP+4 code for 62837?
62837 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 62837, you need to look up a specific street address to get them.
What city is 62837?
62837 is assigned to Fairfield, Illinois, in Wayne 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.