Blog · October 14, 2026 · California
The Danville GIS Map and the county parcel viewer
Parcel data for Danville comes from the county, and the viewer is free.
Main page: Contra Costa County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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When land near Lafayette catches your eye, the Danville GIS map lays out the outline, the owner of record and a parcel ID. What this Danville guide covers: which viewer to open, how to search it, and the limits worth knowing.
Opening the Danville GIS map
For a tract near Lafayette, some cities also run their own GIS portal for utilities or zoning; that can add detail on top of the county map.
The free map to start with
Your first stop is the Contra Costa County parcel viewer; it maps every assessed parcel around Clayton and Walnut Creek. For a parcel near Walnut Creek, enter a street address, an owner's name or a parcel number, then pick the result to center the map on it. For a home near San Ramon, the parcel card usually lists the owner of record, assessed acreage, a parcel ID and often a sale date.
Keeping a record
Save a screenshot of the lot near Walnut Creek and its record panel, so you have it when calling an office.
Danville, CA: the basics
Danville sits in Contra Costa County, California, which means parcel data comes from the county. If you're looking near Lafayette, the municipality handles matters such as zoning, permits and utilities for lots inside the boundary, but the county runs assessment and recording. Land beyond the town limits near Moraga often follows county rules instead.
Three ways to find a parcel
For a house in Danville, search the street address; for owner searches, try last name first. With a lot near Moraga, searching by parcel number never misses, and it carries over to every office in the county.
Layers worth turning on
An aerial view around Walnut Creek to compare lines with fences and driveways.
When a parcel crosses a boundary
Contra Costa County borders Alameda County, Marin County, Sacramento County, San Francisco County, and San Joaquin County, and each of those keeps its own parcel map. Ground near Moraga that runs to the line may show up across two assessors' files, so open the neighboring map before you assume the acreage. For property near Clayton, our state page links each neighboring county map across California.
Reading a parcel record
Recent sales on nearby lots in Danville are a useful starting point; they're not an appraisal.
What the map can't tell you
Listed acreage is a tax-roll number; just a licensed surveyor can set the real lines on land around Clayton. Around San Ramon, records update in batches, so a deed recorded last month might lag behind.
A quick look at the area
Martinez serves as the county seat, which is where the courthouse records live. You'll also find San Ramon, Walnut Creek, Moraga, and Clayton, where town lots give way to larger tracts. About 1,155,025 people live in Contra Costa County (Census Bureau estimate, 2023) on some 717 square miles. Features like Clayton-Marsh Creek-Greenville Fault, San Pablo Dam Reservoir, and Mount Diablo State Park make handy reference points on the map near Concord.
Reading the legal description
California is laid out under the Public Land Survey System, which means a tract near San Ramon is described by section, township and range. A standard section is about one square mile, roughly 640 acres, and a township holds 36 of them, though real sections near Walnut Creek vary in size. Write down the legal description for the tract near San Ramon when you talk to a surveyor.
Using it on a phone
Most viewers work in a phone browser, handy when you're parked on a road near San Ramon, though signal can drop in rural spots. A screenshot of the parcel near San Ramon with its ID is a good backup.
Who handles what
For assessment questions about property around Lafayette go to the County Assessor, which maintains the tax roll. Questions about what you can build around San Ramon are for the local planning and health departments, and the answer depends on jurisdiction.
Recorded documents worth pulling
When the details count, pull the recorded deed from the County Recorder; the parcel map near Concord only summarizes it. Older tracts near Concord may go back through a long string of deeds, and a title company earns its fee before a purchase.
Browser tips
When the map won't open around Lafayette, try a desktop browser or clear the cache; the Platbookmapper county page tracks the current link.
Quick answers
How do I find who owns a lot near Moraga?
Short answer: the parcel record for a lot near Moraga lists the owner of record.
Does the city parcel viewer cost anything near Hercules?
For most people, the county viewer covering Danville needs no account, though printing may be limited.
Can I see aerial photos on the map near Walnut Creek?
In most cases, aerials near Walnut Creek are usually available as a basemap; open the layer list to see what's there.
Where else can I find maps of Danville?
Good question; check the Danville website or ask city hall; the county viewer remains the main parcel source.
How is land described in California deeds for land near San Ramon?
For acreage around Clayton, deeds use lot and block, metes and bounds or survey descriptions; copy it for any survey or title request.
Open the official Contra Costa 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.