PlainZIP

Sioux City, IA · standard

ZIP Code 51101

Woodbury County, Iowa - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

809
265/sq mi
$15,300
Median income
10.9%
Bachelor's or higher

The verdict

Sioux City pairs one of the lowest household incomes in the country, in a low-density, renter-heavy area.

0th pct
household income, US ZIPs
265
people per sq mi
3%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 51101 against every reporting US ZIP.

ZIP code 51101 is a sparsely populated ZIP (a standard USPS delivery area) in Sioux City, Woodbury County, Iowa, home to just 809 residents across 3.1 square miles, a density of 265 people per square mile, in the Chicago time zone.

ZIP 51101 sits on the lower end of the income spectrum: median household income is $15,300 (80% below the Iowa average), while per-capita income is $21,580. Local economic indicators show a 48.1% poverty rate alongside 14.5% unemployment. On housing, the median home value is - with median rent at $708 per month, and 3.4% of occupied units are owner-occupied.

Formal educational attainment runs low here: just 10.9% of adults hold a bachelor's degree or higher, the median age is 40.8, and the average commute is -. Beyond these figures, 10 nearby ZIP codes within about 10 miles are surfaced below, along with 6 more sharing Woodbury County, letting you compare 51101 to its immediate surroundings rather than a national baseline alone.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Top industries in ZIP 51101

Top 5 sectors by establishment count in Sioux City, IA

Which industries have the most business establishments in ZIP 51101.

establishments

What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.

Source U.S. Census Bureau · ZIP Code Business Patterns (ZBP) As of 2023

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 51101, Sioux City, IA · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

809

Population

3.1

Area (sq mi)

265

People / sq mi

Chicago

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 51101?

40.8

Median Age

57.7%

Male

42.3%

Female

6.4%

Foreign-Born

White 71.5%
African American 5.6%
Asian 5.2%
American Indian or Alaska Native 3.2%
Native Hawaiian or Pacific Islander 4.4%
Two or More Ethnicities 8.4%
Hispanic or Latino 10.9%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$15,300

Median Household Income

-80% vs state

$21,580

Per Capita Income

48.1%

Poverty Rate

14.5%

Unemployment Rate

How ZIP 51101 ranks nationally

Sioux City, IA household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$15,300 0th percentile higher than 0% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). This entry sits in this band. $20,000–$40,000: 1,573 US ZIPs (5%). Above this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Above this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Above this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Above this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Above this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Above this entry. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 37.3%
Bachelor's Degree or Higher 10.9%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

788

Total Housing Units

640

Occupied Units

148

Vacant Units

1.26

Avg Household Size

Occupancy Type

Owner 3.4%
Renter 96.6%

$708

Median Rent

1938

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What businesses operate in this ZIP?

Census Bureau data shows 413 business establishments in ZIP 51101, employing approximately 9,223 people with a combined annual payroll of $534,335,000.

413

Businesses

9,223

Employees

$534.3M

Annual Payroll

16

Industry Sectors

Industry Establishments % of Total
Professional, scientific, and technical services 71 17.2%
Accommodation and food services 49 11.9%
Health care and social assistance 41 9.9%
Other services (except public administration) 39 9.4%
Retail trade 35 8.5%
Finance and insurance 35 8.5%
Wholesale trade 30 7.3%
Real estate and rental and leasing 28 6.8%
Administrative and support and waste management and remediation services 24 5.8%
Construction 18 4.4%
Manufacturing 9 2.2%
Information 9 2.2%
Transportation and warehousing 8 1.9%
Arts, entertainment, and recreation 6 1.4%
Management of companies and enterprises 5 1.2%
Educational services 3 0.7%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 51101 vs 51105 →

ZIP 51101 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 51101 ranks #0 by population - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 51101 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 51101 ranks #null of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
51105 Sioux City, IA 10,216 1.7 mi
51104 Sioux City, IA 22,104 2.9 mi
51103 Sioux City, IA 17,453 3.0 mi
68776 South Sioux City, NE 15,447 3.4 mi
51111 Sioux City, IA 94 5.8 mi
51106 Sioux City, IA 26,544 4.2 mi
51108 Sioux City, IA 5,566 5.5 mi
57049 North Sioux City, SD 5,789 6.2 mi
68731 Dakota City, NE 2,637 7.3 mi
51054 Sergeant Bluff, IA 5,110 8.5 mi

More ZIP Codes in Woodbury County

51106 standard
Sioux City, IA
Pop: 26,544
51104 standard
Sioux City, IA
Pop: 22,104
51103 standard
Sioux City, IA
Pop: 17,453
51105 standard
Sioux City, IA
Pop: 10,216
51108 standard
Sioux City, IA
Pop: 5,566
51054 standard
Sergeant Bluff, IA
Pop: 5,110

Related Areas

Woodbury County Sioux City, IA Iowa

Frequently Asked Questions

What county is ZIP code 51101 in? ▼
ZIP code 51101 (Sioux City) is located in Woodbury County, Iowa. Woodbury County contains multiple ZIP codes, see the full list at /counties/woodbury-ia.
What is the population of ZIP code 51101? ▼
ZIP code 51101 in Sioux City, IA has a population of 809 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 51101? ▼
The median household income in ZIP 51101 is $15,300, which is 80% below the national average of $76,288.
What is the demographic makeup of ZIP 51101? ▼
The largest racial group in ZIP 51101 is White at 71.5%. Hispanic or Latino residents make up 10.9% of the population.
How many businesses are in ZIP code 51101? ▼
ZIP code 51101 has 413 business establishments employing approximately 9,223 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 51101? ▼
The top industries by establishment count in ZIP 51101 are: Professional, scientific, and technical services (71), Accommodation and food services (49), Health care and social assistance (41). There are 16 industry sectors represented in total.
What is the education level in ZIP code 51101? ▼
In ZIP code 51101, 37.3% of residents aged 25+ have a high school diploma or higher, and 10.9% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 51101? ▼
In ZIP code 51101, approximately 3.4% of occupied housing units are owner-occupied and 96.6% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 51101? ▼
The poverty rate in ZIP code 51101 is 48.1% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.