ZIP Code 61931 — Humboldt, IL
61931 is a standard (street delivery) ZIP code serving Humboldt, Illinois, in Coles 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 61931 at a glance
| ZIP code | 61931 |
|---|---|
| Primary city | Humboldt |
| State | Illinois (IL) |
| County | Coles FIPS 17029 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,350 |
| Coordinates | 39.590670, -88.358830 |
How ZIP+4 works in 61931
The four digits after the hyphen encode a delivery segment inside 61931. 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 61931 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 61931.
| ZIP | City | Distance |
|---|---|---|
| 61910 | Arcola, IL | 6.5 mi |
| 61938 | Mattoon, IL | 7.7 mi |
| 61911 | Arthur, IL | 9.9 mi |
| 61920 | Charleston, IL | 11.9 mi |
| 61928 | Gays, IL | 12.1 mi |
| 61951 | Sullivan, IL | 12.1 mi |
| 61930 | Hindsboro, IL | 13.7 mi |
| 62440 | Lerna, IL | 14.5 mi |
| 61953 | Tuscola, IL | 14.8 mi |
| 62469 | Trilla, IL | 16.7 mi |
| 61957 | Windsor, IL | 16.7 mi |
| 61913 | Atwood, IL | 17.3 mi |
Questions about 61931
What is the ZIP+4 code for 61931?
61931 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 61931, you need to look up a specific street address to get them.
What city is 61931?
61931 is assigned to Humboldt, Illinois, in Coles 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.