ZIP Code 62351 — Mendon, IL
62351 is a standard (street delivery) ZIP code serving Mendon, Illinois, in Adams 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 62351 at a glance
| ZIP code | 62351 |
|---|---|
| Primary city | Mendon |
| State | Illinois (IL) |
| County | Adams FIPS 17001 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,928 |
| Coordinates | 40.113740, -91.267510 |
How ZIP+4 works in 62351
The four digits after the hyphen encode a delivery segment inside 62351. 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 62351 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 62351.
| ZIP | City | Distance |
|---|---|---|
| 62349 | Loraine, IL | 5.3 mi |
| 62359 | Paloma, IL | 6.4 mi |
| 62325 | Coatsburg, IL | 6.8 mi |
| 62376 | Ursa, IL | 7.3 mi |
| 62348 | Lima, IL | 7.5 mi |
| 62338 | Fowler, IL | 8.5 mi |
| 62380 | West Point, IL | 9.7 mi |
| 62373 | Sutter, IL | 9.7 mi |
| 62320 | Camp Point, IL | 11.6 mi |
| 62339 | Golden, IL | 11.9 mi |
| 62379 | Warsaw, IL | 13 mi |
| 62305 | Quincy, IL | 13.4 mi |
Questions about 62351
What is the ZIP+4 code for 62351?
62351 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 62351, you need to look up a specific street address to get them.
What city is 62351?
62351 is assigned to Mendon, Illinois, in Adams 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.