Blog · October 14, 2026 · California
The Clayton GIS Map and the county parcel viewer
Most property questions near Antioch start with a parcel lookup.
Main page: Contra Costa County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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For any lot around Antioch, a look at the Clayton GIS map gives you lines, owner names and parcel numbers. This Clayton guide covers: which viewer to open, how to search it, and the limits worth knowing.
Getting started with the Clayton GIS map
For property near Pleasant Hill, some cities also run their own GIS portal for utilities or zoning; that can add detail on top of the county map.
The viewer Contra Costa County publishes
Begin with the Contra Costa County parcel viewer; it includes every assessed parcel around Danville and Pleasant Hill. Near Danville, type a street address, an owner's name or a parcel number, and the viewer zooms to the match. In and around Danville, the parcel card typically gives the owner of record, acreage on the tax roll, the parcel number and sometimes recent sales.
On site with the map
The parcel map usually runs in a mobile browser, useful out on a road near Pittsburg, though signal can drop in rural spots. A saved image of the lot near Antioch and its lines keeps working without signal.
Places you'll see on the map
Martinez holds the county offices, home to the main records offices. You'll also find Concord, Pittsburg, Walnut Creek, and Antioch. Roughly 1,155,025 people call Contra Costa County home (Census estimate, 2023) on about 717 square miles. Places such as Clayton-Marsh Creek-Greenville Fault, San Pablo Dam Reservoir, and Mount Diablo State Park make handy reference points on the map near Antioch.
Offices that can help
For assessment questions about property around Antioch go to the County Assessor, which maintains the tax roll. Questions about what you can build around Pittsburg are for the local planning and health departments, depending on whether the land is inside town limits.
Legal descriptions in California
California uses the Public Land Survey System, which means a tract near Pittsburg is described by section, township and range. Each section is nominally a mile square, about 640 acres, and a township holds 36 of them, though sections near Pleasant Hill can be irregular. Keep the legal description for land near Concord when you talk to a surveyor.
Browser tips
When the map won't open around Walnut Creek, try a desktop browser or clear the cache; links occasionally change, and our directory page keeps the current one.
What the map can't tell you
The acreage figure is an assessed number; just a licensed surveyor can set the real corners on land around Antioch. For land near Antioch, owner names and values update on a schedule, so a deed recorded last month may not show yet.
City limits and county records
Clayton is part of Contra Costa County, California, so its parcels are on the county's map. Closer to Walnut Creek, city or town hall handles matters such as zoning, permits and utilities within town limits, and the county still keeps the parcel and deed records. Lots just outside the town limits near Antioch generally falls under county rules rather than the town's.
Backing up the map with records
The map is an index, not the title: deeds, subdivision plats and easements covering ground around Danville are kept by the County Recorder. Long-held tracts near Pleasant Hill can sit on many deeds, so a title company earns its fee before a purchase.
Finding the right lot
For a house in Clayton, search the street address; for owner searches, try last name first. If the land is near Pittsburg, a parcel ID is the most reliable search, and it's printed on tax bills.
Beyond the parcel lines
On ground around Pittsburg, look in the layer list for city limits, flood hazard, zoning or soils; availability varies.
What the record panel tells you
Sales history, if listed, helps with pricing in Clayton give a rough idea of values; they're not an appraisal.
Printing and saving
Save a screenshot of the lot near Pittsburg and its record panel, so you have it when calling an office.
Next door to Contra Costa County
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 Antioch that runs to the line can show up in two county records, so open the neighboring map as well. In and around Danville, our state page links each neighboring county map across California.
Quick answers
Can I use the Clayton GIS map for a fence near Antioch?
It depends, but lines near Walnut Creek can be off by several feet or more, so a licensed surveyor should mark corners.
How do I find who owns a lot near Pittsburg?
The parcel record for a lot near Pittsburg lists the owner of record.
How often is the parcel map updated around Danville?
For land near Concord, records update on the assessor's schedule, so check the deed index.
Where else can I find maps of Clayton?
For most people, check the Clayton website or ask city hall, while parcel data usually comes from the county.
How is land described in California deeds around Danville?
On ground around Pleasant Hill, 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.