Residential delivery area · Iowa
ZIP Code 51101: Sioux City, IA
ZIP code 51101 is in Sioux City, Iowa, entirely in Woodbury County (Census 2020 ZIP-county file). About 1,000 people live there (Census Bureau, ACS 2020-2024), the 7th most populous of Sioux City's 8 residential ZIP codes. Median household income is $15,300 (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
- 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
- 1.2 sq mi · 857 people per sq mi
- PO Box ZIPs
- 51102 also use the name Sioux City
Where is ZIP code 51101?
51101 centers on 42.494°, -96.394° and covers 1.2 square miles of land plus 0.0 of water. It borders 3 ZIP codes: 51105, 51103, 51106.
The map draws ZIP code areas only. For the streets inside 51101, 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 51101 compare with the rest of Sioux City?
| Measure | 51101 | In Sioux City | In Woodbury County | In IA |
|---|---|---|---|---|
| People (ACS 2020-2024) | 1,031 | 7th of 8 | 16th of 26 | 459th of 970 |
| Median household income | $15k | not ranked | not ranked | not ranked |
| Median home value | – | – | – | – |
51101's median household income is not ranked: its 90% margin of error (±$11,482) is more than a quarter of the figure ($15,300). Rankings use ZIP codes of 1,000 or more people living in households, with margins at most 25% of the figure.
It is denser than 77% of 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 51101?
The 2020 Census counted 1,146 people in 51101; the ACS, which samples households over 2020-2024, estimates 1,031. Between the 2010 and 2020 censuses its population grew 41.7% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 1,031±256 (90% margin)
- 2020 Census count
- 1,146+41.7% since 2010 (809)
- Households
- 640
- Median age
- 40.8
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 51101?
Of the 1,031 people the ACS estimates in 51101, 10.0% are under 18 and 17.2% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (66.5%), then Other or two or more (12.2%).
- Under 1810.0%
- 18 to 6472.8%
- 65 and older17.2%
- White, not Hispanic66.5%
- Other or two or more12.2%
- Hispanic or Latino10.9%
- Black, not Hispanic5.6%
- Asian, not Hispanic4.8%
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 51101 earn?
Median household income is $15,300 (ACS 2020-2024). It is not measurably different from 2015-2019 ($20,065 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $15,300±$11,482
- Income per person
- $21,580
- Below the poverty line
- 48.1%
- Unemployed (of the labor force)
- 14.5%
- Adults 25+ with a bachelor's degree
- 10.9%
- Adjusted gross income per tax return, 2022
- $50,343490 returns; wages 75% 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 51101?
- Median home value (owners' estimate)
- –
- Median gross rent
- $708
- Homes owned by their occupants
- 3.4%
- Housing units
- 788
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001).
What businesses are in 51101?
413 business establishments had a location in this ZIP code in 2023, 47 fewer than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services71
- Accommodation and food services49
- Health care and social assistance41
- Other services (except public administration)39
- Retail trade35
- Finance and insurance35
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 51101?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 51105 | Sioux City | 10,415 | $52k | 1.7 mi |
| 51103 | Sioux City | 16,895 | $58k | 3.3 mi |
| 51106 | Sioux City | 28,592 | $78k | 4.6 mi |
| 51104 | Sioux City | 23,197 | $75k | 2.9 mi (near) |
| 68776 | South Sioux City, NE | 15,373 | $69k | 3.8 mi (near) |
| 51111 | Sioux City | 39 | – | 5.2 mi (near) |
| 51108 | Sioux City | 5,960 | $81k | 5.4 mi (near) |
| 57049 | North Sioux City, SD | 7,962 | $93k | 6.2 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.