Blog · October 14, 2026 · California
Using the Tiburon Plat Map
Lots in Tiburon trace back to recorded plats filed with the county.
Main page: Marin County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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If a legal description for land in Tiburon cites a lot number, the Tiburon plat map is where those numbers come from. In this Tiburon guide: where plats are filed, how a plat differs from a parcel map, and the details that matter to buyers.
Getting started with the Tiburon plat map
Near Corte Madera, recorded plats sit with the County Recorder, usually in a plat book or cabinet.
Getting to the right map
Begin with the Marin County parcel viewer; it maps every tax parcel in the county, Larkspur included. For a tract near San Rafael, put in a street address, an owner's name or a parcel number, then pick the result to center the map on it. If you're looking near Larkspur, write down the parcel ID while you have it open; each records desk in the county will want it.
Where Tiburon fits in
Tiburon sits in Marin County, California, so its parcels are on the county's map. For a tract near Belvedere, city or town hall handles things like zoning, permits and utilities within town limits, while the county keeps the tax map. Lots just outside the city limits toward San Rafael generally answers to county rules rather than the town's.
On site with the map
Most viewers work in a phone browser, handy when you're parked on a road near Sausalito, but coverage can be spotty out of town. A printout of the tract near San Rafael helps when you meet an owner or agent.
When there's no plat
Acreage around Sausalito outside a subdivision may have no plat at all; look for a recorded survey for land near San Rafael.
Plat map vs. parcel map
When the two disagree for a lot near Sausalito, go with the plat and a surveyor's work.
Reading the legal description
California uses the Public Land Survey System, which means a tract near Belvedere is described by section, township and range. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though corrections make some sections near Sausalito odd-sized. Write down the legal description for the tract near Corte Madera when you talk to a surveyor.
A word on accuracy
Acreage on the record is an assessed number; only a licensed surveyor can set the real boundary on land around Mill Valley. Owner names and values update on a schedule, so a recent sale near Sausalito may not show yet.
Backing up the map with records
The map is an index, not the title: deeds, subdivision plats and easements covering ground around Belvedere are kept by the County Recorder. For property near Larkspur, use the instrument number shown in the record panel to skip a name search.
Amended plats
Lots near Corte Madera can be combined or reconfigured by a replat, so check for later filings; vacated streets or alleys also get recorded.
What a plat shows
Utility or drainage strips on a lot in Tiburon limit where you can build or fence; read the notes on the sheet.
Who handles what
Recorded documents for a parcel near Belvedere sit in the index kept by the County Recorder, often with an online index. Building or septic questions for a lot near Sausalito are for the local planning and health departments, town or county, depending on location.
Getting a copy
If you're looking near Corte Madera, some counties put plat images online, otherwise call or visit with the reference; small fees are common.
Marin County in a few facts
San Rafael is the county seat, home to the main records offices. You'll also find Belvedere, Sausalito, Corte Madera, and Mill Valley. Around 254,407 people live in Marin County (Census estimate, 2023) spread over roughly 520 square miles. Features like San Pablo Bay, San Francisco Bay, and Golden Gate National Recreation Area are easy to spot when you zoom out from Sausalito.
When a parcel crosses a boundary
Marin County touches Contra Costa County, San Francisco County, Solano County, and Sonoma County; every one of them runs a separate parcel map. Acreage along the edge near Sausalito can show up in two county records, so look at the adjacent map before you assume the acreage. If the land is near Corte Madera, the Platbookmapper state page lists each neighboring county map for California.
Tiburon: common questions
What do the dashed lines on a plat mean near Belvedere?
If the land is near Larkspur, dashed lines often mark easements or building lines; read the plat notes.
What is a replat for land near Mill Valley?
In most cases, lot splits in Tiburon go through the planning office; ask staff about the process.
Are old plats online near San Rafael?
Good question; older plats near Sausalito may be on film or paper, including older subdivisions.
How do I read lot and block in Tiburon?
For a home near San Rafael, lot and block refer to a numbered lot within a block on a recorded subdivision plat.
Why don't the lines match my fence near Larkspur?
The map near Corte Madera is approximate.
Open the official Marin County, CA parcel map See it in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.