Residential delivery area · Iowa
ZIP Code 51106: Sioux City, IA
ZIP code 51106 uses the postal name Sioux City, Iowa and lies entirely in Woodbury County (Census 2020 ZIP-county file). About 29,000 people live there (Census Bureau, ACS 2020-2024), the most populous of Sioux City's 8 residential ZIP codes. Median household income is $78,434 (Census Bureau, ACS 2020-2024). By Census place, 43% of its land lies in Sioux City; 57% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Sioux City · 8 residential ZIPs
- County
- Woodbury County
- Census places
- Sioux City
- Metro area
- Sioux City, IA-NE-SD
- House district
- IA-4 119th Congress
- State
- Iowa
- Time zone
- Central
- Land area
- 33.5 sq mi · 854 people per sq mi
- PO Box ZIPs
- 51102 also use the name Sioux City
Where is ZIP code 51106?
51106 centers on 42.463°, -96.313° and covers 33.5 square miles of land plus 0.4 of water. It borders 9 ZIP codes: 51105, 51101, 51111, 51054, 51030, 68776, 51108, 51007, 51103.
The map draws ZIP code areas only. For the streets inside 51106, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 51106 compare with the rest of Sioux City?
| Measure | 51106 | In Sioux City | In Woodbury County | In IA |
|---|---|---|---|---|
| People (ACS 2020-2024) | 28,592 | 1st of 8 | 1st of 26 | 27th of 970 |
| Median household income | $78k | 2nd of 5 | 5th of 11 | 185th of 396 |
| Median home value | $200k | 2nd of 6 | 8th of 14 | 181st of 423 |
Its median household income is higher than in 60% of U.S. residential ZIP codes, and it is denser than 77% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 51106?
The 2020 Census counted 28,655 people in 51106; the ACS, which samples households over 2020-2024, estimates 28,592. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 28,592
- 2020 Census count
- 28,655
- Households
- 11,249
- Median age
- 36.4
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 51106?
Of the 28,592 people the ACS estimates in 51106, 24.3% are under 18 and 16.5% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (75.1%), then Hispanic or Latino (10.2%).
- Under 1824.3%
- 18 to 6459.1%
- 65 and older16.5%
- White, not Hispanic75.1%
- Hispanic or Latino10.2%
- Other or two or more6.9%
- Black, not Hispanic6.2%
- Asian, not Hispanic1.6%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 51106 earn?
Median household income is $78,434 (ACS 2020-2024), the 5th highest of the 11 ranked ZIP codes in Woodbury County.
- Median household income
- $78,434
- Income per person
- $39,145
- Below the poverty line
- 13.6%
- Unemployed (of the labor force)
- 4.1%
- Adults 25+ with a bachelor's degree
- 28.6%
- Adjusted gross income per tax return, 2022
- $71,23813,680 returns; wages 71% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 51106?
FHFA's house price index for 51106, built from repeat sales and appraisals of the same homes, rose 84% from 2015 to 2025 and rose 45% from 2020 to 2025, and moved +2.8% in 2025.
- Median home value (owners' estimate)
- $200,200
- Median gross rent
- $1,117
- Homes owned by their occupants
- 70.2%
- Housing units
- 11,843
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 51106?
753 business establishments had a location in this ZIP code in 2023, 38 more than in 2018; the most are in retail trade (ZIP Code Business Patterns).
- Retail trade161
- Health care and social assistance102
- Accommodation and food services84
- Other services (except public administration)78
- Construction57
- Finance and insurance49
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 51106?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 51105 | Sioux City | 10,415 | $52k | 4.1 mi |
| 51101 | Sioux City | 1,031 | $15k | 4.6 mi |
| 51111 | Sioux City | 39 | – | 5.1 mi |
| 51054 | Sergeant Bluff | 5,583 | $120k | 5.8 mi |
| 51030 | Lawton | 1,468 | $86k | 6.8 mi |
| 68776 | South Sioux City, NE | 15,373 | $69k | 7.1 mi |
| 51108 | Sioux City | 5,960 | $81k | 7.4 mi |
| 51007 | Bronson | 691 | $117k | 7.6 mi |
| 51103 | Sioux City | 16,895 | $58k | 8.0 mi |
| 51104 | Sioux City | 23,197 | $75k | 6.7 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.