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 High-density area
- $15,300
- Median income Below-median income area
- 10.9%
- Bachelor's or higher Below-average bachelor's attainment
National ZIP placement
Sioux City pairs one of the lowest household incomes in the country, in a low-density, renter-heavy area.
- Lowest
- 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 average Iowa ZIP), while per-capita income is $21,580. Economic pressure is pronounced: 48.1% of residents are below the poverty line and unemployment is 14.5%. The ACS does not report a median home value for this ZIP, so housing cost context is limited to the available tenure and rent fields.
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 -. The page also surfaces 10 ZIP codes within roughly 10 miles and 6 more in Woodbury County, so 51101 can be compared with both its immediate and county-level context.
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.
- Professional, scientific, and technical services
Professional, scientific, and technical services
71 establishments
- Accommodation and food services
Accommodation and food services
49 establishments
- Health care and social assistance
Health care and social assistance
41 establishments
- Other services (except public administration)
Other services (except public administration)
39 establishments
- Retail trade
Retail trade
35 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, 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
Who lives in ZIP 51101?
40.8
Median Age
57.7%
Male
42.3%
Female
6.4%
Foreign-Born
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 ZIP avg
$21,580
Per Capita Income
48.1%
Poverty Rate
14.5%
Unemployment Rate
How ZIP 51101 ranks among Iowa ZIPs
Sioux City, IA household income vs. every Iowa ZIP code
Median household income among 911 reporting Iowa ZIPs (this ZIP's population is too small for a reliable national-corpus placement)
$15,300 0th percentile higher than 0% of 911 Iowa ZIPs
Each bar is a $20K-wide band; taller bars hold more Iowa 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?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
788housing units
788
Total Housing Units
640
Occupied Units
148
Vacant Units
1.26
Avg Household Size
Occupancy Type
$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.
- 51106
Sioux City (51106)
26,544 residents
- 51104
Sioux City (51104)
22,104 residents
- 51103
Sioux City (51103)
17,453 residents
- 68776
South Sioux City (68776)
15,447 residents
- 51105 10,216
Sioux City (51105)
10,216 residents
- 57049 5,789
North Sioux City (57049)
5,789 residents
- 51108 5,566
Sioux City (51108)
5,566 residents
- 51054 5,110
Sergeant Bluff (51054)
5,110 residents
- 68731 2,637
Dakota City (68731)
2,637 residents
What this shows Among its immediate neighbors, ZIP 51101 ranks #0 by population - useful context the national average alone can't give.
ZIP 51101 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 51054
Sergeant Bluff (51054)
$119,716 median income
- 57049
North Sioux City (57049)
$93,134 median income
- 51108
Sioux City (51108)
$81,205 median income
- 68731
Dakota City (68731)
$79,924 median income
- 51106
Sioux City (51106)
$78,434 median income
- 51104
Sioux City (51104)
$75,362 median income
- 68776
South Sioux City (68776)
$68,750 median income
- 51103
Sioux City (51103)
$58,197 median income
- 51105
Sioux City (51105)
$51,786 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.
| 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 |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 51101, both outside IA so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Woodbury County
Related Areas
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.
Related
Take this with you
What to do with ZIP 51101's numbers, next.
- See how ZIP 51101 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Sioux City, IA ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
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ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.