🇺🇸 United States ZIP Code

PO BOX

77456

Markham

ZIP Code 77456 is a po box zip code serving Markham, Markham, Texas (TX), in Matagorda County, United States. It has an estimated population of 1,303 with a median household income of $44,878. The area falls within the America/Chicago timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Texas (TX)
County: Matagorda
City: Markham
Timezone: America/Chicago

Coordinates

Latitude: 28.954700
Longitude: -96.092800

Geographic Details

Land Area: 52.45 mi²
Water Area: 0.31 mi²
Population Density: 25.0 people per mi² (25th percentile)
Bounding Box: 29.088058°N, 28.886419°S, -96.009354°E, -96.195548°W

With 1,303 residents spread across 52.45 square miles, this area has a population density of 25.0 people per square mile.

Demographics

1,303

Population

30th percentile

$44,878

Median Income

40th percentile

$63,800

Median Home Value

5th percentile

52.45 mi²

Land Area

The median household income in 77456 is $44,878, and the median home value is $63,800.

Housing

577

Total Units

484

Occupied Units

83.9%

Occupancy Rate

Similar ZIP Codes in Texas

ZIP codes with similar median household income in Texas.

75701

Tyler

$42,627

77807

Bryan

$42,154

76086

Weatherford

$48,176

77880

Washington

$38,672

78010

Center Point

$45,500

78834

Carrizo Springs

$42,222

79325

Farwell

$44,559

79092

Vega

$44,632

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.