Blog · October 14, 2026 · California
Larkspur GIS Map, California: a how-to
Most property questions near San Rafael start with a parcel lookup.
Main page: Marin County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
Platbookmapper is an Amazon Associate. If you buy through an Amazon link on this page, we earn a commission. The link is a product, not the county map.
Trying to size up a property near Corte Madera? The Larkspur GIS map answers most of that, with no account needed. In this Larkspur guide: which viewer to open, how to search it, and the limits worth knowing.
Getting started with the Larkspur GIS map
For a tract near San Anselmo, some cities also run their own GIS portal for utilities or zoning; that can add detail on top of the county map.
Opening the official parcel viewer
Lots and tracts near Mill Valley can be looked up on the Marin County parcel viewer, which opens without registering. Closer to Tiburon, type a street address, an owner's name or a parcel number, and the viewer zooms to the match. For a home near Tiburon, the record panel normally shows the owner of record, acreage on the tax roll, the parcel number and often a sale date.
How land is described here
California follows the Public Land Survey System, so deeds around Ross reference sections and townships. Each section is nominally a mile square, about 640 acres, and a township holds 36 of them, though sections near San Anselmo can be irregular. Copy the legal description from the record for the parcel near Ross for any title or survey request.
Printing and saving
Print or screenshot the parcel near Tiburon with its ID visible, so you have it when calling an office.
Larkspur, CA: the basics
Larkspur is part of Marin County, California, so its parcels are on the county's map. For a tract near Tiburon, city or town hall handles matters such as zoning, permits and utilities within town limits, while the county keeps the tax map. Land beyond the city limits toward Tiburon often follows county rules, not municipal ones.
Three ways to find a parcel
By address works best for lots in Larkspur; for owner searches, try last name first. Out toward Corte Madera, searching by parcel number never misses, and it's printed on tax bills.
Next door to Marin County
Marin County touches Contra Costa County, San Francisco County, Solano County, and Sonoma County, all with their own assessor records. Ground near Mill Valley that runs to the line may show up across two assessors' files, so open the adjacent map as well. With a lot near Tiburon, our state page links every bordering county map across California.
Field tips
Most viewers work in a phone browser, useful out on a road near Ross, though signal can drop in rural spots. A printout of the tract near San Anselmo helps when you meet an owner or agent.
What the map can't tell you
The acreage figure is an assessed number; only a licensed surveyor can set the real corners on land around Tiburon. Out toward Corte Madera, records update in batches, so a deed recorded last month can take weeks to appear.
Layers worth turning on
For a home near San Rafael, layer lists often include municipal boundaries, floodplain and sometimes zoning; availability varies.
Offices that can help
For assessment questions about property around Ross are handled by the County Assessor, which maintains the tax roll. Questions about what you can build around San Anselmo go to planning, building or health offices, depending on whether the land is inside town limits.
When the map won't load
When the map won't open around San Anselmo, try a desktop browser or clear the cache; the Platbookmapper county page tracks the current link.
A quick look at the area
San Rafael holds the county offices, which is where the courthouse records live. Other places on the map include Corte Madera, Mill Valley, and Ross, where town lots give way to larger tracts. Roughly 254,407 people live in Marin County (Census estimate, 2023) on some 520 square miles. Landmarks such as San Pablo Bay, San Francisco Bay, and Golden Gate National Recreation Area are easy to spot when you zoom out from Mill Valley.
Where the recorded documents are
For anything that matters, get the recorded deed from the County Recorder; the parcel line is a drawing of it, which applies near Ross as much as anywhere. Long-held tracts near Corte Madera can go back through a long string of deeds, and a title company earns its fee on a real sale.
What the record panel tells you
Recent sales on nearby lots near Mill Valley give a rough idea of values; an appraiser is the real authority.
Frequently asked
Does Larkspur have its own GIS map?
In most cases, check the Larkspur website or ask city hall; the county viewer remains the main parcel source.
Is the Larkspur GIS map free?
The county viewer covering Larkspur needs no account, though printing may be limited.
Can I look up a property owner on the map near Mill Valley?
It depends, but the parcel record for a lot near San Rafael lists the owner of record; try variations if nothing comes up.
What layers does the parcel viewer have around Ross?
For a home near San Anselmo, many viewers offer aerial imagery plus layers like city limits, zoning or flood zones.
Is the parcel map a survey around Corte Madera?
No; boundary questions near San Anselmo need a licensed surveyor; a survey sets the real corners
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.