🇺🇸 United States ZIP Code

STANDARD

51439

Charter Oak

ZIP Code 51439 is a standard zip code serving Charter Oak, Charter Oak, Iowa (IA), in Crawford County, United States. It has an estimated population of 1,047 with a median household income of $54,722. The area falls within the America/Chicago timezone.

Median Household Income vs. National Average

Location

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

Coordinates

Latitude: 42.070700
Longitude: -95.599200

Geographic Details

Land Area: 86.12 mi²
Water Area: 0.16 mi²
Population Density: 12.0 people per mi² (15th percentile)
Bounding Box: 42.211071°N, 41.965107°S, -95.478840°E, -95.653583°W

With 1,047 residents spread across 86.12 square miles, this area has a population density of 12.0 people per square mile.

Demographics

1,047

Population

25th percentile

$54,722

Median Income

65th percentile

$66,500

Median Home Value

10th percentile

86.12 mi²

Land Area

The median household income in 51439 is $54,722, and the median home value is $66,500.

Housing

507

Total Units

442

Occupied Units

87.2%

Occupancy Rate

Similar ZIP Codes in Iowa

ZIP codes with similar median household income in Iowa.

50424

Buffalo Center

$53,679

51027

Ireton

$51,484

50604

Aplington

$47,292

50054

Colfax

$46,802

51050

Remsen

$59,479

52316

North English

$56,522

50069

De Soto

$54,000

52233

Hiawatha

$48,333

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.