Sioux City, IA · standard
ZIP Code 51111
Woodbury County, Iowa - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.
- 94
- 5/sq mi Low-density area
- 0.0%
- Bachelor's or higher Below-average bachelor's attainment
National ZIP placement
Sioux City has 94 residents, placing it among the least populous of the 33,099 US ZIP codes with a reported population, at 5 people per square mile.
Source: USPS ZIP record + U.S. Census Bureau ZIP population. Rank compares ZIP 51111 against every US ZIP with a reported population; income/home-value percentiles are not available for this ZIP.
ZIP code 51111 is a sparsely populated ZIP (a standard USPS delivery area) in Sioux City, Woodbury County, Iowa, home to just 94 residents across 17.4 square miles, a density of 5 people per square mile, in the Chicago time zone.
With fewer than 100 residents on file, this page keeps the Census figures below and skips the multi-chart expansion used on larger ZIPs. Small-N ACS estimates are already unstable enough without padding the page around them.
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 →
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 51111, 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
94
Population
17.4
Area (sq mi)
5
People / sq mi
Chicago
Time Zone
standard
ZIP Type
Who lives in ZIP 51111?
26.4
Median Age
61.5%
Male
38.5%
Female
0.0%
Foreign-Born
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How much do residents earn?
$29,128
Per Capita Income
0.0%
Poverty Rate
0.0%
Unemployment Rate
10.0 min
Mean Commute Time
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
27housing units
27
Total Housing Units
27
Occupied Units
0
Vacant Units
1.44
Avg Household Size
Occupancy Type
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What businesses operate in this ZIP?
Census Bureau data shows 96 business establishments in ZIP 51111, employing approximately 6,303 people with a combined annual payroll of $361,874,000.
96
Businesses
6,303
Employees
$361.9M
Annual Payroll
8
Industry Sectors
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 51111 vs 51054 →
Related Areas
Frequently Asked Questions
What county is ZIP code 51111 in?
ZIP code 51111 (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 51111?
ZIP code 51111 in Sioux City, IA has a population of 94 according to the Census Bureau ACS 2023 estimates.
Take this with you
What to do with ZIP 51111's numbers, next.
- See how ZIP 51111 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
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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.