🇺🇸 United States ZIP Code

STANDARD

51105

Sioux City

ZIP Code 51105 is a standard zip code serving Sioux City, Sioux City, Iowa (IA), in Woodbury County, United States. It has an estimated population of 10,216 with a median household income of $27,365. The area falls within the America/Chicago timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Iowa (IA)
County: Woodbury
City: Sioux City
Timezone: America/Chicago

Coordinates

Latitude: 42.503200
Longitude: -96.382900

Geographic Details

Land Area: 6.08 mi²
Water Area: 0.03 mi²
Population Density: 1680.0 people per mi² (80th percentile)
Bounding Box: 42.532982°N, 42.485782°S, -96.331043°E, -96.410295°W

With 10,216 residents spread across 6.08 square miles, this area has a population density of 1680.0 people per square mile.

Demographics

10,216

Population

70th percentile

$27,365

Median Income

5th percentile

$55,000

Median Home Value

5th percentile

6.08 mi²

Land Area

The median household income in 51105 is $27,365, and the median home value is $55,000. This is below the national average for household income.

Housing

4,060

Total Units

3,700

Occupied Units

91.1%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Sioux City, IA.

51101

Sioux City

51102

Sioux City

51103

Sioux City

51104

Sioux City

51106

Sioux City

51108

Sioux City

51109

Sioux City

51111

Sioux City

Similar ZIP Codes in Iowa

ZIP codes with similar median household income in Iowa.

50314

Des Moines

$30,473

52802

Davenport

$31,568

50309

Des Moines

$32,256

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.