🇺🇸 United States ZIP Code

STANDARD

51109

Sioux City

ZIP Code 51109 is a standard zip code serving Sioux City, Sioux City, Iowa (IA), in Woodbury County, United States. It has an estimated population of 3,098 with a median household income of $41,827. 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: 42.517300
Longitude: -96.480300

Geographic Details

Land Area: 18.14 mi²
Water Area: 0.84 mi²
Population Density: 171.0 people per mi² (60th percentile)
Bounding Box: 42.649529°N, 42.489220°S, -96.440297°E, -96.531615°W

With 3,098 residents spread across 18.14 square miles, this area has a population density of 171.0 people per square mile.

Demographics

3,098

Population

45th percentile

$41,827

Median Income

30th percentile

$88,400

Median Home Value

25th percentile

18.14 mi²

Land Area

The median household income in 51109 is $41,827, and the median home value is $88,400.

Housing

1,357

Total Units

1,298

Occupied Units

95.7%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Sioux City, IA.

51101

Sioux City

51102

Sioux City

51103

Sioux City

51104

Sioux City

51105

Sioux City

51106

Sioux City

51108

Sioux City

51111

Sioux City

Similar ZIP Codes in Iowa

ZIP codes with similar median household income in Iowa.

50249

Stratford

$44,219

50833

Bedford

$44,509

52404

Cedar Rapids

$45,973

50662

Oelwein

$40,385

50049

Chariton

$42,247

52659

Winfield

$45,588

50475

Sheffield

$47,986

50841

Corning

$45,613

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.