🇺🇸 United States ZIP Code

STANDARD

51566

Red Oak

ZIP Code 51566 is a standard zip code serving Red Oak, Red Oak, Iowa (IA), in Montgomery County, United States. It has an estimated population of 7,035 with a median household income of $42,938. The area falls within the America/Chicago timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Iowa (IA)
County: Montgomery
City: Red Oak
Timezone: America/Chicago

Coordinates

Latitude: 41.007900
Longitude: -95.226900

Geographic Details

Land Area: 176.22 mi²
Water Area: 0.57 mi²
Population Density: 40.0 people per mi² (35th percentile)
Bounding Box: 41.174066°N, 40.857440°S, -95.070400°E, -95.366364°W

With 7,035 residents spread across 176.22 square miles, this area has a population density of 40.0 people per square mile.

Demographics

7,035

Population

60th percentile

$42,938

Median Income

35th percentile

$78,500

Median Home Value

15th percentile

176.22 mi²

Land Area

The median household income in 51566 is $42,938, and the median home value is $78,500.

Housing

3,478

Total Units

3,020

Occupied Units

86.8%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Red Oak, IA.

51591

Red Oak

Similar ZIP Codes in Iowa

ZIP codes with similar median household income in Iowa.

51334

Estherville

$48,157

50554

Laurens

$41,815

50129

Jefferson

$45,933

50533

Eagle Grove

$45,985

52136

Cresco

$46,200

50208

Newton

$47,060

52540

Brighton

$49,038

52342

Toledo

$42,059

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.