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Waimalu, Hawaii

11 topographic sheets cover this place, the earliest surveyed in 1954 and the latest in 1998. It stands in the Ewa census division. It lies in ZIP code area 96701. It lies near Punanani Gulch. The Survey maps it on the Waipahu quadrangle. 13,817 people lived here at the 2020 count. It stands 377 feet above sea level.

Waimalu within Honolulu County

On record in Waimalu

Buildings and businesses the archive holds for this place. Each opens its own page, with the source record it came from.

On the National Register 1 record

Population over time

2 figures

Waimalu grew from 13,730 to 13,817 between 2010 and 2020. These are the recorded population figures Wikidata holds for this place, reached through the Geographic Names Information System number this page is keyed on rather than by name, so they belong to this place and not to another of the same name. Most are census counts, but not all are: an early figure may be a founding or settlement estimate, and an estimate published within five years of a census is left out. The change column is computed, and is left blank where more than 20 years separate a figure from the one before it, because a gap that long is not a change between two counts.

YearPeople Change
201013,730
202013,817+87 (+1%)

Topographic sheets covering this place

9 surveys from 11 printed sheets

Matched by testing this settlement's coordinate against the published boundary of every sheet in the United States Geological Survey's historical collection. Each opens the scanned sheet at the Survey.

Fires near this place

841 since 1992

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 841 fires within 5 miles of Waimalu between 1992 and 2017, burning about 3,334 acres in total. None started naturally. 1 was recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.

Reported cause Fires
Missing data/not specified/undetermined839
Arson/incendiarism1
Recreation and ceremony1

The most recent of them, most recent first, with the day each was reported and the service that recorded it.

DateCause SizeReported by Name on the report
9 September 2012Missing data/not specified/undeterminedunder an acreCity and County of Honolulunot named
9 September 2009Missing data/not specified/undeterminedunder an acreCity and County of Honolulunot named
9 September 2009Missing data/not specified/undetermined20 acresCity and County of Honolulunot named
8 September 2009Missing data/not specified/undeterminedunder an acreCity and County of Honolulunot named
8 September 2008Missing data/not specified/undeterminedunder an acreCity and County of Honolulunot named
8 September 2004Missing data/not specified/undeterminedunder an acreCity and County of Honolulunot named
7 September 2003Missing data/not specified/undeterminedunder an acreCity and County of Honolulunot named
6 September 2012Missing data/not specified/undetermined1.5 acresCity and County of Honolulunot named

Settlements close enough to share some of these fires:

Every fire recorded in Honolulu County

Mines and quarries near this place

1 within 5 miles

Regional context, not property-specific evidence. The federal mineral resources record lists 1 working within 5 miles of Waimalu: 1 producer. All of them still produce. What was taken out: Stone. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Where SiteCommodity StatusRecorded
Halawa Quarry and MillStoneProducer

Every working recorded in Honolulu County

Storms near this place

8 since 2013

Regional context, not property-specific evidence. The National Weather Service names Waimalu in 8 storm reports between 2013 and 2025: 5 heavy rain, 2 flash flood, 1 flood. No death or injury is recorded in these reports. Each account below is quoted exactly as the forecast office filed it, from the NOAA Storm Events Database, and each date opens the federal record of that event.

WhenEvent Place namedHarm What the report says
December 2025FloodWaimalu-Multiple roads reportedly had several feet of water, due to poor drainage. These roads included Richards Street, H-1 westbound under Radford Drive, and Nimitz Highway near the Likelike Highway. Additionally, there was a water rescue in Kalihi.
October 2018Flash FloodWaimalu-The three right lanes of the east-bound H-1 Freeway became impassable after flooding from heavy rain.
August 2015Flash FloodWaimalu-Two lanes along H-1 westbound near the Waimalu off-ramp on Oahu were flooded and became impassable.
March 2021Heavy RainWaimalu-no account filed
November 2020Heavy RainWaimalu-no account filed
March 2017Heavy RainWaimalu-no account filed
October 2016Heavy RainWaimalu-no account filed
March 2013Heavy RainWaimalu-no account filed

Every storm recorded in Honolulu County

Nearest settlements

The eight closest, with where each one stands in the county. Distances are straight-line, computed from the Geographic Names Information System coordinates.

Map PlaceDistance Sheets
Pearl City0.8 miles11
Waiau1.2 miles11
Kalauao1.5 miles11
Pacific Palisades1.5 miles11
ʻAiea1.6 miles11
ʻAiea Heights1.7 miles11
ʻEwa-Schofield Junction2.0 miles11
Hālawa2.1 miles11

Elsewhere

Matched on this settlement's Geographic Names Information System number rather than its name, so it cannot be a different place of the same name in another state.

Wikipedia article on WaimaluAn encyclopaedic summary. Its text is share-alike, so it is linked here rather than copied.
Wikidata item Q2541865The structured record the population and elevation above come from. Public domain (CC0).

Provenance

This settlement is recorded in the Geographic Names Information System as feature 1867264. The sheet list is computed by point-in-boundary test against the United States Geological Survey's historical topographic inventory. Both are works of the United States government and carry no copyright under 17 U.S.C. 105.

Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.

Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.

Storms. NOAA National Centers for Environmental Information, Storm Events Database https://www.ncei.noaa.gov/stormevents/ A work of the United States government, no copyright under 17 U.S.C. 105. Narratives are quoted verbatim from the National Weather Service report and are not edited or summarised.