Census tract · Honolulu County
Census Tract 89.31, Honolulu County, Hawaii
Census Tract 89.31, GEOID 15003008931, in Honolulu County, Hawaii, mostly within Mililani Mauka (58% of its census blocks). 2,959 residents in the ACS 2020-2024 5-year estimates (±339); the 2020 Census counted 3,224.
Residents, 2020-2024
2,959
±339 (90% margin)
2020 Census count: 3,224
Median household income
$204,583
±$13,523 (90% margin)
Honolulu County: $106,195
Median home value
$1,220,200
±$49,465 (90% margin)
Honolulu County: $897,500
Median gross rent
$3,500 or more
The survey's top or bottom value; no margin is published
Honolulu County: $2,083
Where is Census Tract 89.31?
Census Tract 89.31 is one of 330 census tracts in Honolulu County, Hawaii. It covers 27.79 square miles of land, 116 residents per square mile in 2020. Its GEOID, 15003008931, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Mililani Mauka | 58% |
15 census tracts border Census Tract 89.31: Tract 80.05 ($128,894), Tract 80.09 ($61,994), Tract 80.11 ($132,167), Tract 87.04 ($123,438), Tract 89.17 ($137,448), Tract 89.21 ($143,125), Tract 89.26 ($96,250), Tract 89.28 ($166,150), Tract 89.29 ($99,818), Tract 89.30 ($161,290), Tract 89.45 ($79,783), Tract 89.46 ($113,030), Tract 102.05 ($114,412), Tract 103.03 ($130,132) and Tract 9807*. The figure in brackets is each tract's median household income; * a special land-use tract (water, a park or an institution) with few or no residents.
Whether a tract counts as low- or moderate-income for bank lending (the Community Reinvestment Act) is set by the FFIEC against its metro area's family income: look it up in the FFIEC census geocoder.
Source: 2024 Gazetteer and 2020 block assignment files, U.S. Census Bureau · Census reference files
How many people live in Census Tract 89.31?
The 2020-2024 American Community Survey puts Census Tract 89.31's population at 2,959 (±339) in 794 households; the 2020 Census counted 3,224 residents and 835 housing units.
| Measure | Tract 89.31 | Mililani Mauka |
|---|---|---|
| Total population | 2,959±339 | 21,278 |
| Households | 794±86 | 7,525 |
| Average household size | 3.48±0.25 | 2.82 |
| Housing units | 825±74 | 7,747 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Census Tract 89.31?
The median resident of Census Tract 89.31 is 41.9 years old; 24.8% are under 18 and 6.8% are 65 or older. The largest group is non-Hispanic Asian residents at 54.2%, then non-Hispanic residents of two or more races at 21.8%. 9.4% of residents were born outside the United States.
| Measure | Tract 89.31 | Mililani Mauka |
|---|---|---|
| Median age | 41.9±4.0 | 38.7 |
| Under 18 years | 24.8%±3.5 pts | 24.2% |
| 65 years and over | 6.8%±1.7 pts | 11.3% |
| Hispanic or Latino (any race) | 4.9%±2.9 pts | 9.7% |
| White alone, not Hispanic | 11.9%±3.6 pts | 13.1% |
| Black or African American alone, not Hispanic | 0.7%±1.0 pts | 2.5% |
| Asian alone, not Hispanic | 54.2%±7.4 pts | 47.2% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±1.1 pts | 0.2% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 6.6%±4.3 pts | 4.3% |
| Two or more races, not Hispanic | 21.8%±5.2 pts | 22.8% |
| Some other race alone, not Hispanic | 0.0%±1.1 pts | 0.2% |
| Born outside the United States | 9.4%±3.3 pts | 9.0% |
| Speak a language other than English at home (age 5+) | 12.7%±3.6 pts | 12.4% |
| Civilian veterans (age 18+) | 8.0%±2.4 pts | 9.3% |
| With a disability | 8.0%±3.3 pts | 8.1% |
| No health insurance coverage | 2.8%±1.7 pts | 1.8% |
| High school graduate or higher (age 25+) | 96.4%±2.2 pts | 98.4% |
| Bachelor's degree or higher (age 25+) | 55.1%±6.4 pts | 51.5% |
| Graduate or professional degree (age 25+) | 18.1%±3.7 pts | 16.5% |
| Lived in the same house a year earlier | 95.0%±2.3 pts | 88.8% |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Census Tract 89.31 earn?
Half of the 794 households in Census Tract 89.31 earn less than $204,583 a year (±$13,523), against $106,195 across Honolulu County: 3rd highest of the county's 312 tracts with a reliable estimate.
| Measure | Tract 89.31 | Mililani Mauka |
|---|---|---|
| Median household income | $204,583±$13,523 | $138,942 |
| Mean household income | $226,870±$28,428 | $160,699 |
| Per capita income | $61,863±$7,470 | $57,346 |
| People below the poverty line | 1.3%±1.5 pts | 3.3% |
| Children under 18 below the poverty line | 0.8%±1.4 pts | 3.0% |
| Households receiving SNAP | 0.0%±4.0 pts | 3.5% |
| Households with a computer | 96.9%±4.4 pts | 99.0% |
| Households with a broadband subscription | 96.9%±4.4 pts | 97.2% |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Census Tract 89.31?
Owners occupy 91.6% of Census Tract 89.31's occupied homes and renters 8.4%. The median owner-occupied home is valued at $1,220,200 by its owner (±$49,465). The median renter pays $3,500 or more a month including utilities.
| Measure | Tract 89.31 | Mililani Mauka |
|---|---|---|
| Median home value (owner-occupied) | $1,220,200±$49,465 | $988,100 |
| Median gross rent | $3,500 or more | $2,350 |
| Renters paying 35% or more of income on rent | 42.9%±36.2 pts | 48.9% |
| Median monthly owner costs, with a mortgage | $3,950±$237 | $3,289 |
| Owner-occupied homes | 91.6%±5.4 pts | 74.9% |
| Renter-occupied homes | 8.4%±5.4 pts | 25.1% |
| Housing units | 825±74 | 7,747 |
| Single-family detached homes | 98.4%±1.7 pts | 54.3% |
| Mobile homes | 0.7%±1.1 pts | 0.2% |
| Built 2020 or later | 0.0%±3.9 pts | 0.2% |
| Built 2010 to 2019 | 4.6%±4.4 pts | 4.5% |
| Built 1939 or earlier | 0.0%±3.9 pts | 0.0% |
| Households with no vehicle | 4.3%±4.6 pts | 3.0% |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Census Tract 89.31 get to work?
77.9% of Census Tract 89.31's workers drive alone and 10.1% work from home. The average trip to work takes 30.5 minutes. The unemployment rate in 2020-2024 averaged 3.0%.
| Measure | Tract 89.31 | Mililani Mauka |
|---|---|---|
| In the labor force (age 16+) | 66.7%±3.9 pts | 72.1% |
| Unemployment rate | 3.0%±1.7 pts | 2.3% |
| Drove alone to work | 77.9%±5.5 pts | 76.8% |
| Carpooled | 10.7%±4.8 pts | 10.2% |
| Public transportation | 0.0%±2.1 pts | 1.2% |
| Walked | 0.8%±0.9 pts | 0.3% |
| Worked from home | 10.1%±4.0 pts | 10.3% |
| Mean travel time to work | 30.5 min±1.9 | 29.0 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
How does Census Tract 89.31 compare with the other tracts in Honolulu County?
Among Honolulu County's tracts with a reliable estimate, Census Tract 89.31 ranks as shown below (1 = highest).
| Measure | In Honolulu County | In Mililani Mauka |
|---|---|---|
| Population | 153rd of 319 | 4th of 7 |
| Residents per square mile | 314th of 329 | 7th of 7 |
| Median household income | 3rd of 312 | 1st of 7 |
| Per capita income | 55th of 317 | 3rd of 7 |
| Median home value | 35th of 284 | 1st of 7 |
| Median gross rent | 1st of 298 | 1st of 7 |
| Bachelor's degree or higher | 57th of 313 | 3rd of 7 |
| Median age | 173rd of 319 | 3rd of 7 |
| Owner-occupied share | 13th of 287 | 1st of 7 |
The tracts next to it on Honolulu County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 4.02 | 1st | $239,063±$75,917 · within the margin of this tract |
| Tract 1.14 | 2nd | $209,107±$82,611 · within the margin of this tract |
| Tract 89.31 | 3rd | $204,583±$13,523 |
| Tract 31.04 | 4th | $204,375±$56,457 · within the margin of this tract |
| Tract 1.19 | 5th | $198,000±$34,673 · within the margin of this tract |
| Tract 78.17 | 6th | $193,854±$104,000 · within the margin of this tract |
"Within the margin": the two incomes differ by less than their combined 90% margins, so the survey cannot say which is higher and the ranks between them are not firm.
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · How ranks are computed
How reliable are the figures for Census Tract 89.31?
2 of the 18 figures for Census Tract 89.31 on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
A census tract's figures rest on a few hundred sampled households over five years, so its margins are wider than a city's. Two tracts differ only when the gap between them is larger than their combined 90% margin (the square root of the sum of the two squared margins). How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · Check it at data.census.gov
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections