100 Smallest ZIP Codes in the United States by Population in Mercer 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 Mercer County, Illinois.
| Rank | ZIP Code | City | State | Population |
|---|---|---|---|---|
| 1 | 61276 | PREEMPTION | IL | 77 |
| 2 | 61466 | NORTH HENDERSON | IL | 267 |
| 3 | 61260 | JOY | IL | 595 |
| 4 | 61476 | SEATON | IL | 605 |
| 5 | 61442 | KEITHSBURG | IL | 678 |
| 6 | 61263 | MATHERVILLE | IL | 808 |
| 7 | 61465 | NEW WINDSOR | IL | 1,250 |
| 8 | 61272 | NEW BOSTON | IL | 1,357 |
| 9 | 61486 | VIOLA | IL | 1,450 |
| 10 | 61281 | SHERRARD | IL | 2,553 |
| 11 | 61231 | ALEDO | IL | 5,158 |