100 Smallest ZIP Codes in the United States by Population in Union County, South Dakota
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 Union County, South Dakota.
| Rank | ZIP Code | City | State | Population |
|---|---|---|---|---|
| 1 | 57038 | JEFFERSON | SD | 1,577 |
| 2 | 57001 | ALCESTER | SD | 1,608 |
| 3 | 57025 | ELK POINT | SD | 3,063 |
| 4 | 57004 | BERESFORD | SD | 3,900 |
| 5 | 57049 | NORTH SIOUX CITY | SD | 7,661 |