ZIP Code 61865 — Potomac, IL
61865 is a standard (street delivery) ZIP code serving Potomac, Illinois, in Vermilion 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 61865 at a glance
| ZIP code | 61865 |
|---|---|
| Primary city | Potomac |
| State | Illinois (IL) |
| County | Vermilion FIPS 17183 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,167 |
| Coordinates | 40.303620, -87.800470 |
How ZIP+4 works in 61865
The four digits after the hyphen encode a delivery segment inside 61865. 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 61865 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 61865.
| ZIP | City | Distance |
|---|---|---|
| 61848 | Henning, IL | 5.2 mi |
| 61831 | Collison, IL | 5.3 mi |
| 61812 | Armstrong, IL | 5.6 mi |
| 61862 | Penfield, IL | 7.9 mi |
| 60963 | Rossville, IL | 9 mi |
| 61811 | Alvin, IL | 9.4 mi |
| 60960 | Rankin, IL | 10.5 mi |
| 60932 | East Lynn, IL | 11.1 mi |
| 61847 | Gifford, IL | 11.3 mi |
| 61844 | Fithian, IL | 11.6 mi |
| 61858 | Oakwood, IL | 12 mi |
| 61871 | Royal, IL | 12.2 mi |
Questions about 61865
What is the ZIP+4 code for 61865?
61865 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 61865, you need to look up a specific street address to get them.
What city is 61865?
61865 is assigned to Potomac, Illinois, in Vermilion 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.