ZIP Code 62921 — Colp, IL
62921 is a standard (street delivery) ZIP code serving Colp, Illinois, in Williamson 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 62921 at a glance
| ZIP code | 62921 |
|---|---|
| Primary city | Colp |
| State | Illinois (IL) |
| County | Williamson FIPS 17199 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 233 |
| Coordinates | 37.802170, -89.082150 |
How ZIP+4 works in 62921
The four digits after the hyphen encode a delivery segment inside 62921. 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 62921 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 62921.
| ZIP | City | Distance |
|---|---|---|
| 62918 | Carterville, IL | 1.2 mi |
| 62915 | Cambria, IL | 2.5 mi |
| 62948 | Herrin, IL | 3.3 mi |
| 62949 | Hurst, IL | 3.8 mi |
| 62933 | Energy, IL | 3.9 mi |
| 62841 | Freeman Spur, IL | 6.1 mi |
| 62999 | Zeigler, IL | 6.4 mi |
| 62924 | De Soto, IL | 6.8 mi |
| 62983 | Royalton, IL | 7 mi |
| 62901 | Carbondale, IL | 8.2 mi |
| 62951 | Johnston City, IL | 8.7 mi |
| 62902 | Carbondale, IL | 9.2 mi |
Questions about 62921
What is the ZIP+4 code for 62921?
62921 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 62921, you need to look up a specific street address to get them.
What city is 62921?
62921 is assigned to Colp, Illinois, in Williamson 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.