Sioux City, Iowa ZIP Codes
- ZIP records
8 - Sum of listed ZIP population estimates
89,735 - Counties represented
2 - Population range
39–28,592 per ZIP
Population sum includes positive estimates in these ZIP records; it is not an official city population.
Top ZIP Codes by Population
| Rank | ZIP Code | City | County | Population estimate |
|---|---|---|---|---|
| 1 | 51106 | Sioux City | Woodbury | 28,592 |
| 2 | 51104 | Sioux City | Woodbury | 23,197 |
| 3 | 51103 | Sioux City | Woodbury | 16,895 |
| 4 | 51105 | Sioux City | Woodbury | 10,415 |
| 5 | 51108 | Sioux City | Plymouth | 5,960 |
| 6 | 51109 | Sioux City | Plymouth | 3,606 |
| 7 | 51101 | Sioux City | Woodbury | 1,031 |
| 8 | 51111 | Sioux City | Woodbury | 39 |
Counties represented
All ZIP Codes in Sioux City
- ZIP 51101 — Woodbury County
- ZIP 51103 — Woodbury County
- ZIP 51104 — Woodbury County
- ZIP 51105 — Woodbury County
- ZIP 51106 — Woodbury County
- ZIP 51108 — Plymouth County
- ZIP 51109 — Plymouth County
- ZIP 51111 — Woodbury County
Methodology: ZIP records are grouped by the source file's primary city and state fields. Population ranges and sums use positive ZIP-level estimates; sums should not be read as official city totals. County links use each record's listed county assignment.