Zip Code 96789
Mililani, Hawaii — Honolulu County
📍 ZIP code 96789 is in Mililani, Honolulu County, Hawaii.
ZIP code 96789 is located in Mililani, Honolulu County, Hawaii. It is a zip code in the Hawaii (HST) Time Zone with an estimated population of 54,608. The area code for ZIP code 96789 is 808.
Quick Answer
Zip code 96789 is in Mililani, Hawaii (Honolulu County). It has a population of 54,608, median household income of $125,822, and median home value of $871,000.
Population
54,608
Income
$125,822
Home Value
$871,000
Climate
82°F / 61°F
About Zip Code 96789
Zip code 96789 is located in Mililani, Hawaii, within Honolulu County. Home to approximately 54,608 residents, this area sits at an elevation of 1466 ft and falls within the Hawaii (HST) timezone. The local area code is 808.
The median household income is $125,822 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $871,000, and the cost of living index is 242 (142% above the national average of 100).
Summers average a high of 82°F while winters drop to 61°F. The area receives about 64 in of rain annually. The zip code covers 27.3 square miles of land area and 0.2 square miles of water.
Key Statistics
54,608
$125,822
$871,000
Hawaii (HST)
808
1466 ft
27.3 sq mi
42
19,736
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Compare With Nearby Zip Codes
| Metric | 96789 | 96797 | 96782 | 96717 | 96701 | 96786 |
|---|---|---|---|---|---|---|
| City | Mililani, HI | Waipahu, HI | Pearl City, HI | Hauula, HI | Aiea, HI | Wahiawa, HI |
| Population | 54,608 | 72,717 | 37,740 | 4,396 | 40,504 | 41,293 |
| Median Income | $125,822 | $110,036 | $104,779 | $105,357 | $107,888 | $83,488 |
| Home Value | $871,000 | $798,600 | $846,200 | $874,000 | $913,300 | $724,400 |
| Cost of Living | 242 | 221 | 231 | 224 | 241 | 182 |
| Median Age | 42 | 41.3 | 42.8 | 34.9 | 44 | 28 |
Cost of Living
100 = National Average. Mililani's cost of living is 142% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
6.9x
Demographics
Zip code 96789 has a population of 54,608 people with a median age of 42. There are 19,736 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Mililani (96789) population trend from 2010 to 2024
↓ -15.8%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
82°F
61°F
64 in
0 in
Mililani experiences warm summers with average highs around 82°F. Winters are mild with lows averaging 61°F. The area receives virtually no snowfall.
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Housing & Economy
Median Home Value
$871,000
Median Household Income
$125,822
With 19,736 housing units across 27.3 square miles, 96789 has a housing density of 723 units per square mile. The home price-to-income ratio is 6.9x.
Location & Geography
Latitude
21.4839°
Longitude
-157.9343°
Land Area
27.3 sq mi
Water Area
0.2 sq mi
Nearby Zip Codes
Zip codes closest to 96789 (Mililani, HI) with distances:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 96789's $125,822. A way to compare Mililani to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 96789 (Mililani, HI). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Mililani, Hawaii?
Mililani, Hawaii uses zip code 96789.
What county is zip code 96789 in?
Zip code 96789 is located in Honolulu County, Hawaii.
What is the population of zip code 96789?
The population of zip code 96789 is 54,608 with a median age of 42.
Is 96789 in Mililani, Hawaii?
Yes, zip code 96789 is in Mililani, Honolulu County, Hawaii. The area code is 808.
Frequently Asked Questions
What city is zip code 96789 in?
Zip code 96789 is in Mililani, Hawaii. It is part of Honolulu County and uses the Hawaii (HST) timezone.
What is zip code 96789?
Zip code 96789 is a U.S. postal code in Mililani, Hawaii (Honolulu County). It has a population of 54,608 and covers 27.3 square miles.
What is the population of zip code 96789?
The population of zip code 96789 (Mililani, HI) is 54,608 with a median age of 42. There are approximately 19,736 housing units in this area.
What is the median income in zip code 96789?
The median household income in zip code 96789 (Mililani, HI) is $125,822 per year. The cost of living index is 242 (100 = national average).
What is the average home price in zip code 96789?
The median home value in zip code 96789 (Mililani, HI) is $871,000. The cost of living index is 242 compared to the national average of 100.
What county is zip code 96789 in?
Zip code 96789 is located in Honolulu County, Hawaii. The primary city is Mililani.
What is the area code for zip code 96789?
Zip code 96789 in Mililani, HI uses area code 808. It is located in the Hawaii (HST) timezone.
Is zip code 96789 a good place to live?
Zip code 96789 (Mililani, HI) has a cost of living index of 242 (100 = national average), a median household income of $125,822, and median home values of $871,000. The median age is 42. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 96789?
The cost of living index for zip code 96789 (Mililani, HI) is 242, where 100 represents the national average. This area is above the national average. Median home value: $871,000.
What schools serve zip code 96789?
Zip code 96789 in Mililani, Hawaii is served by the local school district of Honolulu County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.