100 Smallest ZIP Codes in the United States by Population in Williamson County, Illinois
Explore the 100 smallest ZIP codes in the United States ranked by population using U.S. Census demographic data. This page lists ZIP codes located in Williamson County, Illinois.
| Rank | ZIP Code | City | State | Population |
|---|---|---|---|---|
| 1 | 62841 | FREEMAN SPUR | IL | 140 |
| 2 | 62921 | COLP | IL | 243 |
| 3 | 62915 | CAMBRIA | IL | 431 |
| 4 | 62949 | HURST | IL | 770 |
| 5 | 62933 | ENERGY | IL | 1,253 |
| 6 | 62974 | PITTSBURG | IL | 1,523 |
| 7 | 62922 | CREAL SPRINGS | IL | 2,824 |
| 8 | 62951 | JOHNSTON CITY | IL | 5,574 |
| 9 | 62918 | CARTERVILLE | IL | 10,844 |
| 10 | 62948 | HERRIN | IL | 12,679 |
| 11 | 62959 | MARION | IL | 27,255 |