100 Smallest ZIP Codes in the United States by Population in Winneshiek County, Iowa
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 Winneshiek County, Iowa.
| Rank | ZIP Code | City | State | Population |
|---|---|---|---|---|
| 1 | 52168 | SPILLVILLE | IA | 350 |
| 2 | 52133 | CASTALIA | IA | 627 |
| 3 | 52144 | FORT ATKINSON | IA | 1,031 |
| 4 | 52165 | RIDGEWAY | IA | 1,094 |
| 5 | 52161 | OSSIAN | IA | 1,396 |
| 6 | 52132 | CALMAR | IA | 1,845 |
| 7 | 52101 | DECORAH | IA | 12,962 |