Blog · October 14, 2026 · California
Using the Mill Valley Zoning Map
A parcel's zoning district shapes building, splitting and business use near Tiburon.
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 Corte Madera, look at the Mill Valley zoning map before anything else: a district label can make or break the plan. In this Mill Valley guide: which office sets the rules for a lot, matching a lot to its zoning district, and what to ask the planning staff.
Getting started with the Mill Valley zoning map
Within municipal limits, zoning usually comes from the municipality, so property inside Mill Valley follows that code. Past the city line, around Tiburon, county rules apply where they exist; the county planning or zoning office can confirm. The quickest way to tell which applies: ask whether the parcel near Sausalito is inside the boundary.
The viewer Marin County publishes
Your first stop is the Marin County parcel viewer; it covers every tax parcel around Corte Madera and Ross. Out toward Sausalito, type a street address, an owner's name or a parcel number, and the matching parcel lights up. With a lot near Ross, a pop-up or side panel typically gives the owner of record, acreage on the tax roll, the parcel number and in many cases the last transfer.
Mill Valley, CA: the basics
Mill Valley sits in Marin County, California, so its parcels are on the county's map. With a lot near Belvedere, city or town hall handles things like zoning, permits and utilities within town limits, while the county keeps the tax map. Acreage past the city limits out by Tiburon generally falls under county rules rather than the town's.
Deeds, plats and who keeps them
For anything that matters, pull the recorded deed through the County Recorder; the parcel map near Belvedere only summarizes it. With a lot near Sausalito, have ready the instrument number shown in the record panel so staff can find the deed fast.
What the map can't tell you
Parcel lines are drawn for taxes, not measured on the ground, so a tree line near Tiburon often sits several feet off the line on screen. Records update in batches, so a recent sale near Ross might lag behind.
Questions for the planning office
When you call about land near Corte Madera, give the parcel number and your intended use; staff can point to the right section of the ordinance. Also ask whether the lot near Sausalito is a legal lot of record, since some older splits don't.
Neighboring parcel maps
Marin County touches Contra Costa County, San Francisco County, Solano County, and Sonoma County; every one of them runs a separate parcel map. A tract near the line by Corte Madera can be split in two county records, so open the neighboring map before you assume the acreage. For property near Belvedere, our state page lists each neighboring county map for California.
Finding a parcel's zoning district
Start by finding the parcel on the Marin County parcel viewer, copy its parcel ID, then compare it to the zoning map from the office covering Mill Valley. If you're looking near Belvedere, district codes like R-1, C-2 or A-1 aren't self-explanatory, so read the ordinance chapter for each; the letters vary from place to place.
Permits after zoning
Even when zoning allows a use near Sausalito, you still need building permits and inspections; septic or sewer and driveway access are often reviewed too.
Who handles what
Recorded documents for a parcel near Sausalito come from the County Recorder, sometimes only in person. Zoning, permits and septic questions near Sausalito go to planning, building or health offices, and the answer depends on jurisdiction.
Rules tied to a district
If the land is near Sausalito, the ordinance spells out what's allowed outright and what needs approval. If you're looking near Ross, overlays, whether historic, floodplain or corridor, can add rules on top of the base district.
Reading the legal description
California is laid out under the Public Land Survey System, so deeds around Sausalito reference sections and townships. A standard section is about one square mile, roughly 640 acres, and a township holds 36 of them, though sections near Belvedere can be irregular. Keep the legal description for land near Sausalito for any title or survey request.
Taking the map into the field
The parcel map usually runs in a mobile browser, handy when you're parked on a road near Sausalito, so load it before you lose signal. A saved image of the lot near Tiburon and its lines keeps working without signal.
Changing what's allowed
With a lot near Corte Madera, most of these involve time, so budget weeks or months before you close.
Frequently asked
What are setbacks in Mill Valley?
Good question; setbacks near Sausalito depend on the zoning district; the ordinance has the numbers.
What is the zoning on a property near Corte Madera?
Usually, start with the parcel record, then check the adopted zoning map for Mill Valley; staff can confirm by phone or email.
How do variances work near Corte Madera?
Usually, boards in Mill Valley grant variances only when strict rules cause a real hardship; ask staff about the standards.
Can I run a business from home in Mill Valley?
Good question; rules near Tiburon usually cover signs, traffic and employees; ask the planning office first.
Can I download parcel lines near Belvedere?
Use the print button or a screenshot, and it's worth keeping the parcel ID visible for land near Corte Madera.
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.