TMK checker and Hawaiʻi land rules guide

Paste a Hawaiʻi TMK in any form and get the standard form, what each part means, and a link to the lot. Below it, plain explanations of the land rules a sheet shows.

Any TMK: with dashes, spaces or brackets, 8, 9, 12 or 13 digits

How a TMK is built

The standard form is D-Z-S-PPP-PPP-CCCC:

D, division. The County: 1 Oʻahu, 2 Maui County (Maui, Molokaʻi, Lānaʻi, Kahoʻolawe), 3 Hawaiʻi Island, 4 Kauaʻi (with Niʻihau).
Z, zone. A large district of the island.
S, section. A part of the zone.
PPP, plat. One tax map sheet in the section.
PPP, parcel. The lot on that plat.
CCCC, CPR unit. Only for a unit in a condominium property regime; otherwise left off or 0000.

Tax bills and County sites often drop the division digit and put it in brackets, as in (4) 4-2-016-063. Eight digits are a TMK without the division; the checker shows the lot on each island so you can pick yours.

Where to find yours

On the property tax bill, the deed, the listing, or the County real property tax site. If you only have an address, type it on the map and the sheet shows the TMK at the top. More on reading one: What is a TMK.

Hawaiʻi land rules, in plain words

Each card on a sheet reads one rule or map. These pages explain what each one means, the law behind it and who to ask.

Special Management Area (SMA)The coastal zone where most building needs a County SMA permit first.State Land Use DistrictsEvery acre in Hawaiʻi is Urban, Rural, Agricultural or Conservation.FEMA flood zones and what X shaded meansThe letters on the flood map: A and V zones are the 1 percent flood; X is lower risk.FIRM panels and LOMAsThe official flood map sheet for a lot, and the letter FEMA issues when a lot sits above the flood.Tsunami evacuation and extreme tsunami zonesThe red zone leaves on most tsunami warnings; the yellow extreme zone only when the warning says extreme.Sea level rise exposure areaLand that could flood with 3.2 feet of sea level rise, mapped by the State.Lava flow hazard zones 1 to 9Hawaiʻi Island is mapped into nine zones by the chance of lava covering the land.CPR lots (condominium property regime)A way to own part of one lot as a unit, often used for two homes on one parcel.ʻOhana units and accessory dwelling unitsA second, smaller home on a lot. Each County writes its own rules.Shoreline setbackHow far back from the certified shoreline a building must sit.Cesspool conversion (Act 125)State law requires cesspools to be upgraded, converted or connected to sewer by 2050.Important Agricultural Lands (IAL)Farm land the State has designated to keep in agriculture, with incentives for owners.Conveyance taxThe State tax paid when real property changes hands.Property tax classes by CountyEach County sorts property into classes, and each class has its own tax rate.TMK (Tax Map Key)The number that names every parcel in Hawaiʻi.

Planning offices

Checked 2026-10-17. Plain explanations, not legal advice. The County and State offices decide.