100 Largest ZIP Codes in the United States by Population in Richland County, Illinois
Explore the 100 largest ZIP codes in the United States ranked by population using U.S. Census demographic data. This page lists ZIP codes located in Richland County, Illinois.
| Rank | ZIP Code | City | State | Population |
|---|---|---|---|---|
| 1 | 62450 | OLNEY | IL | 12,327 |
| 2 | 62868 | NOBLE | IL | 1,706 |
| 3 | 62425 | DUNDAS | IL | 843 |
| 4 | 62421 | CLAREMONT | IL | 406 |
| 5 | 62452 | PARKERSBURG | IL | 325 |
| 6 | 62419 | CALHOUN | IL | 258 |