🇺🇸 United States ZIP Code

STANDARD

96789

Mililani

ZIP Code 96789 is a standard zip code serving Mililani, Mililani, Hawaii (HI), in Honolulu County, United States. It has an estimated population of 54,129 with a median household income of $92,309. The area falls within the Pacific/Honolulu timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Hawaii (HI)
County: Honolulu
City: Mililani
Timezone: Pacific/Honolulu

Coordinates

Latitude: 21.453100
Longitude: -158.017400

Geographic Details

Land Area: 27.28 mi²
Water Area: 0.16 mi²
Population Density: 1984.0 people per mi² (85th percentile)
Bounding Box: 21.509795°N, 21.406415°S, -157.890352°E, -158.047604°W

With 54,129 residents spread across 27.28 square miles, this area has a population density of 1984.0 people per square mile.

Demographics

54,129

Population

95th percentile

$92,309

Median Income

90th percentile

$541,500

Median Home Value

95th percentile

27.28 mi²

Land Area

The median household income in 96789 is $92,309, and the median home value is $541,500. This places the area in the top 25% nationally for household income.

Housing

18,650

Total Units

18,124

Occupied Units

97.2%

Occupancy Rate

Similar ZIP Codes in Hawaii

ZIP codes with similar median household income in Hawaii.

96797

Waipahu

$81,897

96706

Ewa Beach

$86,093

96782

Pearl City

$78,848

96734

Kailua

$89,016

96701

Aiea

$83,255

96744

Kaneohe

$85,608

96707

Kapolei

$96,611

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.