Sioux City, IA ZIP codes
Sioux City, Iowa has 9 ZIP codes, including 1 PO Box ZIP. They are in Woodbury County and Plymouth County.
- Population in these ZIPs
- 89,735
- Avg. median income
- $70,200population-weighted
- Typical home value
- $201,700population-weighted
- Metro area
- Sioux City, IA-NE-SD
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Sioux City, IA ZIP codes list
| ZIP code | County | Population | Median income | Typical home value |
|---|---|---|---|---|
| 51101 | Woodbury County | 1,031 | $15,300 | $177,600 |
| 51102 PO Box | Woodbury County | — | — | — |
| 51103 | Woodbury County | 16,895 | $58,197 | $161,200 |
| 51104 | Woodbury County | 23,197 | $75,362 | $226,800 |
| 51105 | Woodbury County | 10,415 | $51,786 | $137,300 |
| 51106 | Woodbury County | 28,592 | $78,434 | $222,300 |
| 51108 | Plymouth County | 5,960 | $81,205 | $252,600 |
| 51109 | Plymouth County | 3,606 | $79,034 | $175,800 |
| 51111 | Woodbury County | 39 | — | — |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near Sioux City
- Sergeant Bluff 8 mi
- Lawton 10 mi
- Hinton 11 mi
- Bronson 12 mi
- Salix 14 mi
- Merrill 15 mi
- Westfield 16 mi
- Moville 17 mi
- Climbing Hill 19 mi
- Sloan 21 mi
- Kingsley 21 mi
- Brunsville 22 mi
Frequently asked questions
What is the ZIP code for Sioux City, IA?
Sioux City, IA has 9 ZIP codes: 51101, 51102, 51103, 51104, 51105, 51106, 51108, 51109 and 51111.
What county is Sioux City, Iowa in?
Sioux City ZIP codes are in Woodbury County and Plymouth County.
Which Sioux City ZIP codes are PO Boxes?
51102 is a PO Box or single-organization ZIP code; it has no residential delivery area.