County ZIP codes · Iowa · FIPS 19193
Woodbury County, IA ZIP Codes
Woodbury County, Iowa has 27 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 26 residential and 1 for PO boxes or a single organization. 20 of the residential ones lie mainly in Woodbury County and 6 mainly in a neighboring county; 12 cross the county line. Median household income ranges from $51,786 in 51105 (Sioux City) to $119,716 in 51054 (Sergeant Bluff) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Woodbury County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $58,197 and $81,205.
They carry 19 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 26 residential ZIP codes in Woodbury County
20 ZIP codes lie mainly in Woodbury County; 6 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 51106 | Sioux City | 28,592 | 854 | $78k | $200k | 100% |
| 51104 | Sioux City | 23,197 | 3,103 | $75k | $211k | 100% |
| 51103 | Sioux City | 16,895 | 1,400 | $58k | $143k | 100% |
| 51105 | Sioux City | 10,415 | 1,750 | $52k | $96k | 100% |
| 51054 | Sergeant Bluff | 5,583 | 144 | $120k | $302k | 100% |
| 51039 | Moville | 2,845 | 33 | $110k | $268k | 100% |
| 51030 | Lawton | 1,468 | 25 | $86k | $271k | 100% |
| 51055 | Sloan | 1,346 | 21 | $72k | $218k | 51% |
| 51016 | Correctionville | 1,080 | 10 | $52k | $89k | 91% |
| 51052 | Salix | 1,050 | 17 | $109k | $281k | 100% |
| 51101 | Sioux City | 1,031 | 857 | $15k | – | 100% |
| 51026 | Hornick | 910 | 8 | $81k | $211k | 65% |
| 51004 | Anthon | 858 | 10 | $44k | $115k | 100% |
| 51007 | Bronson | 691 | 20 | $117k | $241k | 100% |
| 51019 | Danbury | 448 | 5 | $75k | $106k | 79% |
| 51048 | Pierson | 435 | 12 | $83k | $103k | 49% |
| 51056 | Smithland | 346 | 10 | $103k | $157k | 85% |
| 51044 | Oto | 165 | 5 | $90k | $84k | 100% |
| 51015 | Climbing Hill | 45 | 35 | $88k | $138k | 100% |
| 51111 | Sioux City | 39 | 6 | – | – | 100% |
Partly in Woodbury County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 51108 | Sioux City | 5,960 | 130 | $81k | $170k | 47% |
| 51018 | Cushing | 542 | 17 | $61k | $315k | 44% |
| 51028 | Kingsley | 2,191 | 18 | $78k | $220k | 20% |
| 51034 | Mapleton | 1,674 | 14 | $66k | $121k | 16% |
| 51006 | Battle Creek | 1,287 | 16 | $76k | $85k | 12% |
| 51109 | Sioux City | 3,606 | 205 | $79k | $131k | 10% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
12 ZIP codes of Woodbury County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Woodbury | Elsewhere |
|---|---|---|
| 51108 | 47% | Plymouth County 53% |
| 51109 | 10% | Plymouth County 90% |
| 51028 | 20% | Plymouth County 80% |
| 51034 | 16% | Monona County 80%; Crawford County 4% |
| 51055 | 51% | Monona County 49% |
| 51006 | 12% | Ida County 86%; Crawford County 2% |
| 51016 | 91% | Ida County 9% |
| 51026 | 65% | Monona County 35% |
| 51018 | 44% | Ida County 56% |
| 51019 | 79% | Ida County 12%; Crawford County 8% |
| 51048 | 49% | Cherokee County 40%; Plymouth County 11% |
| 51056 | 85% | Monona County 15% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 51102 | Sioux City |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Woodbury County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Woodbury County's ZIP codes use 2 prefixes: 510 and 511.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.