Blog · October 14, 2026 · California
San Anselmo GIS Map: looking up parcels
Parcel data for San Anselmo comes from the county, and the viewer is free.
Main page: Marin County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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For any lot around Corte Madera, a look at the San Anselmo GIS map gives you the outline, the owner of record and a parcel ID. What this San Anselmo guide covers: where that map lives, the fastest ways to search, and the limits worth knowing.
Finding a lot on the San Anselmo GIS map
Some cities also run their own GIS portal for utilities or zoning; ask city hall in San Anselmo whether one exists.
Pulling up a parcel
Go first to the Marin County parcel viewer; it covers each assessed parcel in the county, Corte Madera included. For acreage around San Rafael, type a street address, an owner's name or a parcel number, and the viewer zooms to the match. Closer to Mill Valley, the record panel normally shows the owner of record, acreage on the tax roll, a parcel ID and often a sale date.
Getting answers from the right desk
Recorded documents for a parcel near Mill Valley come from the County Recorder, often with an online index. Zoning, permits and septic questions near San Rafael go to planning, building or health offices, and the answer depends on jurisdiction.
Browser tips
If the viewer stalls on a phone near Corte Madera, try a desktop browser or clear the cache; the Platbookmapper county page tracks the current link.
Next door to Marin County
Marin County meets Contra Costa County, San Francisco County, Solano County, and Sonoma County, and each of those keeps its own parcel map. Ground near Corte Madera that runs to the line can be split in two county records, so open the neighboring map as well. Around Novato, the Platbookmapper state page lists each neighboring county map across California.
Places you'll see on the map
San Rafael is the county seat, where most land records are kept. Other places on the map include Ross, Larkspur, and Corte Madera. About 254,407 people live in Marin County (Census estimate, 2023) spread over about 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 Corte Madera.
San Anselmo, CA: the basics
San Anselmo is part of Marin County, California, so its parcels are on the county's map. For property near Novato, the municipality handles matters such as zoning, permits and utilities for lots inside the boundary, but the county runs assessment and recording. Acreage past the city limits toward Novato generally follows county rules instead.
On site with the map
The parcel map usually runs in a mobile browser, which helps when you're standing on land near Corte Madera, so load it before you lose signal. A screenshot of the parcel near Ross with its ID keeps working without signal.
Printing and saving
Print or screenshot the parcel near Ross with its ID visible, which helps later when you ask the assessor or a title company.
A word on accuracy
The acreage figure is an assessed number; just a licensed surveyor establishes the real corners for a parcel near Novato. On ground around Novato, owner names and values update on a schedule, so a deed recorded last month might lag behind.
Legal descriptions in California
California follows the Public Land Survey System, so deeds around Larkspur reference sections and townships. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though corrections make some sections near Novato odd-sized. Write down the legal description for the tract near Ross when you talk to a surveyor.
Searching the map
By address works best for lots in San Anselmo; owner search often wants the surname first. For a parcel near Novato, searching by parcel number never misses, and it carries over to every office in the county.
Aerials, labels and overlays
An aerial view around Corte Madera shows roofs, driveways and tree lines next to the parcel edges.
Inside the parcel card
If sale dates appear, they help gauge the market near San Rafael give a rough idea of values; an appraiser is the real authority.
Where the recorded documents are
The map is an index, not the title: recorded deeds, subdivision plats and easements for land near Larkspur are kept by the County Recorder. Older tracts near Novato can trace back through a long string of deeds, and a title company can sort it out before a purchase.
Questions about the San Anselmo GIS map
Are parcel lines on the map exact around Ross?
It depends, but lines near Mill Valley can be off by several feet or more, so a licensed surveyor should mark corners.
Why does a recent sale near Ross not show?
For a tract near Novato, updates come in batches.
Does San Anselmo have its own GIS map?
It depends, but San Anselmo may publish zoning or utility maps separately; the county viewer remains the main parcel source.
What layers does the parcel viewer have near Novato?
For most people, aerials near San Rafael are usually available as a basemap; open the layer list to see what's there.
Why don't the lines match my fence near Novato?
No; boundary questions near Corte Madera need a licensed surveyor, so a fence may sit off the line
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.