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How to Look Up Any Property in Hawaii by TMK Number

May 2026 · 6 min read

Every parcel of land in Hawaii — from a single Honolulu condo unit to a 10,000-acre ranch on Maui — has a unique Tax Map Key. Once you know how to read one, you can pull ownership records, assessed values, zoning classifications, flood data, and more in under a minute.

What is a TMK?

TMK stands for Tax Map Key. It is the official parcel identifier used by each of Hawaii's four counties — Honolulu (Oahu), Maui, Hawaii (Big Island), and Kauai — for property tax assessment and land record purposes. Every piece of titled land in the state has one.

Unlike an address, which can be ambiguous or missing entirely for rural land, a TMK is precise. It maps to exactly one legal parcel, which is why deeds, title reports, permits, and GIS databases all reference it.

How to read a TMK number

A standard TMK has the format: (Island)-(Zone)-(Section)-(Plat)-(Parcel)

For example: 1-2-3-045-012

Segment	Meaning	Example
Island digit	1 = Oahu, 2 = Maui, 3 = Hawaii Island, 4 = Kauai, 5 = Molokai, 6 = Lanai, 9 = Kahoolawe	1 (Oahu)
Zone	Geographic tax zone within the island — large regions used by the county assessor	2
Section	Subdivision of the zone	3
Plat	A recorded subdivision map number within the section	045
Parcel	The individual lot within the plat	012

Some counties append a Unit segment (e.g., 1-2-3-045-012-0001) for condominiums, identifying individual units within a building parcel.

Note on formats

You will see TMKs written with hyphens, without them, or in 9-digit compressed form (123045012). All refer to the same parcel. ʻĀina Atlas accepts any format — just type or paste it into the search bar.

How to find a TMK from an address

If you only have a street address, here are the fastest ways to find the corresponding TMK:

ʻĀina Atlas — type any Hawaii address into the search bar. The map zooms to the parcel and shows the TMK, ownership, zoning, and assessed value instantly.
County property search portals — each county runs its own public real property assessment site. Honolulu uses qpublic.net/hi/honolulu, Maui uses mauipropertytax.com, Hawaii County uses propertytax.ehawaii.gov, and Kauai uses the County of Kauai real property site.
From a deed or title report — the TMK is always listed on recorded deeds at the Hawaii Bureau of Conveyances. If you have a prior deed, the TMK is in the header.
From a permit — building permits issued by county DPP offices always reference the TMK.

What you can learn from a TMK lookup

Once you have a TMK, the amount of data available publicly is substantial:

Owner of record — the name on the current deed, updated at each transfer.
Assessed land and building value — the county's annual tax assessment, separated by land and improvements. Not the same as market value, but a useful floor.
Zoning classification — R-3.5, AG-1, B-1, and so on. This governs what can be built, how dense, and what setbacks apply.
Acreage — the legal lot size from the tax map.
Flood zone — whether the parcel falls in a FEMA Special Flood Hazard Area (SFHA) and which flood zone designation applies.
Lava zone — for Big Island parcels, USGS lava hazard zone 1 through 9.
Ahupuaʻa — the traditional Hawaiian land division the parcel sits within.
Permit history — recorded building, renovation, and demolition permits, available by county.
Conservation district status — whether the parcel is in or adjacent to a state conservation district, which adds land use restrictions.

TMK vs address: which to use

Addresses work well in dense urban areas but break down on undeveloped rural land, agricultural parcels, and anything without a street-front. TMKs are unambiguous. When doing any due diligence — buying, permitting, financing, or subdividing — always confirm the TMK rather than relying on address alone.

County-specific quirks

Maui County includes Molokai and Lanai in its TMK system (island digits 5 and 6). Hawaii County sometimes hyphenates differently in older records. If a TMK lookup returns nothing, try dropping leading zeros from the section or plat — legacy systems varied in formatting.

What a TMK can't tell you

A few things require more than a TMK lookup. Actual sale price is not directly linked to the TMK in most public databases — you need to cross-reference Bureau of Conveyances transfer records. Active code violations and open permit appeals require contacting the county DPP directly. And easements, CC&Rs, and private deed restrictions live in recorded documents, not the tax map.

Look up any Hawaii parcel by TMK or address

ʻĀina Atlas shows ownership, zoning, assessed value, flood zone, lava hazard, permits, and more — free for your first five parcels.

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