Residential delivery area · Iowa
ZIP Code 51105: Sioux City, IA
ZIP code 51105 is in Sioux City, Iowa, entirely in Woodbury County (Census 2020 ZIP-county file). About 10,000 people live there (Census Bureau, ACS 2020-2024), the 4th most populous of Sioux City's 8 residential ZIP codes. Median household income is $51,786 (Census Bureau, ACS 2020-2024).
- 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
- 6.0 sq mi · 1,750 people per sq mi
- PO Box ZIPs
- 51102 also use the name Sioux City
Where is ZIP code 51105?
51105 centers on 42.508°, -96.366° and covers 6.0 square miles of land plus 0.0 of water. It borders 5 ZIP codes: 51101, 51104, 51106, 51108, 51103.
The map draws ZIP code areas only. For the streets inside 51105, 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 51105 compare with the rest of Sioux City?
| Measure | 51105 | In Sioux City | In Woodbury County | In IA |
|---|---|---|---|---|
| People (ACS 2020-2024) | 10,415 | 4th of 8 | 4th of 26 | 76th of 970 |
| Median household income | $52k | 5th of 5 | 11th of 11 | 391st of 396 |
| Median home value | $96k | 6th of 6 | 12th of 14 | 414th of 423 |
Its median household income is higher than in 17% of U.S. residential ZIP codes, and it is denser than 83% 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 51105?
The 2020 Census counted 10,565 people in 51105; the ACS, which samples households over 2020-2024, estimates 10,415. Between the 2010 and 2020 censuses its population grew 3.4% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 10,415
- 2020 Census count
- 10,565+3.4% since 2010 (10,216)
- Households
- 3,596
- Median age
- 29.6
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 51105?
Of the 10,415 people the ACS estimates in 51105, 34.2% are under 18 and 6.3% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (38.9%), then Hispanic or Latino (37.0%).
- Under 1834.2%
- 18 to 6459.5%
- 65 and older6.3%
- White, not Hispanic38.9%
- Hispanic or Latino37.0%
- Other or two or more12.7%
- Black, not Hispanic8.9%
- Asian, not Hispanic2.4%
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 51105 earn?
Median household income is $51,786 (ACS 2020-2024), the 11th highest of the 11 ranked ZIP codes in Woodbury County. It is not measurably different from 2015-2019 ($59,202 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $51,786±$7,804
- Income per person
- $24,008
- Below the poverty line
- 21.6%
- Unemployed (of the labor force)
- 6.2%
- Adults 25+ with a bachelor's degree
- 7.8%
- Adjusted gross income per tax return, 2022
- $41,6864,000 returns; wages 89% 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 51105?
FHFA's house price index for 51105, built from repeat sales and appraisals of the same homes, rose 99% from 2015 to 2025 and rose 42% from 2020 to 2025, and moved +0.2% in 2025.
- Median home value (owners' estimate)
- $96,200
- Median gross rent
- $859
- Homes owned by their occupants
- 48.2%
- Housing units
- 4,053
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 51105?
218 business establishments had a location in this ZIP code in 2023, 11 fewer than in 2018; the most are in retail trade (ZIP Code Business Patterns).
- Retail trade44
- Health care and social assistance26
- Construction25
- Wholesale trade23
- Other services (except public administration)18
- Accommodation and food services17
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 51105?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 51101 | Sioux City | 1,031 | $15k | 1.7 mi |
| 51104 | Sioux City | 23,197 | $75k | 2.6 mi |
| 51106 | Sioux City | 28,592 | $78k | 4.1 mi |
| 51108 | Sioux City | 5,960 | $81k | 4.1 mi |
| 51103 | Sioux City | 16,895 | $58k | 4.3 mi |
| 68776 | South Sioux City, NE | 15,373 | $69k | 5.6 mi (near) |
| 51111 | Sioux City | 39 | – | 6.3 mi (near) |
| 57049 | North Sioux City, SD | 7,962 | $93k | 7.4 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.