Blog · October 14, 2026 · California
San Anselmo Zoning Map, California: what to check
Zoning decides what can be built where, and the answer for a lot near Corte Madera starts with the right map.
Main page: Marin County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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If you have a specific use in mind for land near Larkspur, check the San Anselmo zoning map first: the zoning district can make or break the plan. What this San Anselmo guide covers: which office sets the rules for a lot, how to match a parcel to its district, and when a variance or rezoning comes up.
Reading the San Anselmo zoning map for one lot
Inside town or city limits, zoning usually comes from the municipality, so a lot in San Anselmo is governed there. Past the city line, around San Rafael, the county's ordinance, if any, takes over; the county planning or zoning office can confirm. A fast way to settle it: ask whether the parcel near Mill Valley is inside the boundary.
The free map to start with
Begin with the Marin County parcel viewer; it covers each tax parcel in the county, Novato included. For property near San Rafael, put in a street address, an owner's name or a parcel number, and the viewer zooms to the match. For property near Mill Valley, the parcel card usually lists the owner of record, acreage on the tax roll, the parcel number and sometimes recent sales.
San Anselmo and the county around it
San Anselmo lies within Marin County, California, so its parcels are on the county's map. For a parcel near Novato, city or town hall handles things like zoning, permits and utilities within town limits, but the county runs assessment and recording. Land beyond the city limits out by Larkspur usually answers to county rules rather than the town's.
Using it on a phone
Most viewers work in a phone browser, which helps when you're standing on land near Novato, so load it before you lose signal. A printout of the tract near Novato helps when you meet an owner or agent.
Matching a lot to the San Anselmo zoning map
Pull the parcel up on the Marin County parcel viewer, note the parcel number, then compare it to the zoning map from the office covering San Anselmo. Closer to San Rafael, labels such as R-1, B-2 or AG stand for residential, commercial or agricultural districts; the letters vary from place to place.
Zoning is only step one
Even when zoning allows a use near Corte Madera, a building permit is a separate step; health and road departments may weigh in on land near San Rafael.
Recorded documents worth pulling
The map is an index, not the title: recorded deeds, plats and easements covering ground around Mill Valley sit with the County Recorder. Older tracts near Ross may trace back through a long string of deeds, and a title company is worth hiring if money is changing hands.
Reading the legal description
California is laid out under the Public Land Survey System, so deeds around Novato reference sections and townships. Each section is nominally a mile square, about 640 acres, and a township holds 36 of them, though corrections make some sections near Novato odd-sized. Write down the legal description for the tract near Novato when you talk to a surveyor.
Setbacks, lot size and uses
Around Corte Madera, the ordinance spells out uses allowed by right, uses needing a permit, and uses not allowed. For a home near Mill Valley, overlays, whether historic, floodplain or corridor, can add rules on top of the base district.
Calling planning staff
When you call about land near Novato, give the parcel number and your intended use; ask what's allowed by right and what needs a permit. Also ask whether the lot near Mill Valley is a legal lot of record, since some older splits don't.
Which office to call
If the acreage or value on a parcel near Novato looks off go to the County Assessor, which maintains the tax roll. Zoning, permits and septic questions near Novato go to planning, building or health offices, depending on whether the land is inside town limits.
Changing what's allowed
For land near Corte Madera, most of these involve time, so budget weeks or months before you close.
What the map can't tell you
Listed acreage is an assessed number; just a licensed surveyor sets the real corners on land around Corte Madera. If you're looking near Novato, records update in batches, so a deed recorded last month can take weeks to appear.
Getting your bearings
San Rafael serves as the county seat, which is where the courthouse records live. You'll also find Ross, Larkspur, and Corte Madera, each with its own cluster of lots. Around 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 help you orient on the aerial around Novato.
Questions about the San Anselmo zoning map
Can I run a business from home around Novato?
In most cases, home businesses in San Anselmo are often allowed with conditions; ask the planning office first.
Does the county parcel map show zoning near Ross?
In most cases, some viewers include a zoning layer; confirm any layer with planning staff in San Anselmo.
What are setbacks in San Anselmo?
Short answer: setbacks near Mill Valley depend on the zoning district; planning staff can confirm for your lot.
Is land outside the town zoned near Novato?
For most people, county rules near Ross vary, so ask the county planning office.
Who do I call about a parcel near Corte Madera?
For land near Corte Madera, assessment goes to the County Assessor and deeds to the County Recorder.
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.