Blog · October 14, 2026 · California
Oakley GIS Map, California: a how-to
Parcel data for Oakley 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 Antioch catches your eye, a look at the Oakley GIS map gives you the outline, the owner of record and a parcel ID. Covered here for Oakley: which viewer to open, how to search it, and the limits worth knowing.
Getting started with the Oakley GIS map
In most places the county maintains the parcel layer, and for Oakley that means the Contra Costa County parcel viewer.
Getting to the right map
Begin with the Contra Costa County parcel viewer; it covers every assessed parcel around Brentwood and Clayton. On ground around Brentwood, put in a street address, an owner's name or a parcel number, and the matching parcel lights up. For a tract near Clayton, the parcel card usually lists the owner of record, assessed acreage, the parcel number and in many cases the last transfer.
Oakley and the county around it
Oakley lies within Contra Costa County, California, which means parcel data comes from the county. Closer to Clayton, city or town hall handles things like zoning, permits and utilities for lots inside the boundary, and the county still keeps the parcel and deed records. Acreage past the city limits toward Pittsburg usually falls under county rules instead.
On site with the map
Most viewers work in a phone browser, handy when you're parked on a road near Clayton, so load it before you lose signal. A saved image of the lot near Brentwood and its lines helps when you meet an owner or agent.
Backing up the map with records
The map is an index, not the title: deeds, plats and easements covering ground around Brentwood sit with the County Recorder. For acreage around Danville, have ready the document number from the tax record so staff can find the deed fast.
Finding the right lot
Addresses are the easiest route inside Oakley; owner names are usually entered last name first. In and around Danville, searching by parcel number never misses, and it's printed on tax bills.
A word on accuracy
Acreage on the record is an estimate; only a licensed surveyor can set the real corners on land around Antioch. For acreage around Concord, owner names and values update on a schedule, so a deed recorded last month might lag behind.
Aerials, labels and overlays
In and around Clayton, layer lists often include zoning, flood zones, city limits, school districts or contours; not every viewer has them all.
When a parcel crosses a boundary
Contra Costa County meets Alameda County, Marin County, Sacramento County, San Francisco County, and San Joaquin County; every one of them runs a separate parcel map. Acreage along the edge near Clayton can be split across two assessors' files, so open the neighboring map before you assume the acreage. For a parcel near Danville, the Platbookmapper state page lists each neighboring county map across California.
Reading a parcel record
Sales history, if listed, helps with pricing around Brentwood give a rough idea of values; an appraiser is the real authority.
Browser tips
When the map won't open around Danville, switch browsers or turn off pop-up blockers; the Platbookmapper county page tracks the current link.
Legal descriptions in California
California is laid out under the Public Land Survey System, which means a tract near Danville is described by section, township and range. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though sections near Pittsburg can be irregular. Copy the legal description from the record for the parcel near Pittsburg for any title or survey request.
Keeping a record
Save a screenshot of the lot near Danville and its record panel, so you have it when calling an office.
A quick look at the area
Martinez is the county seat, home to the main records offices. You'll also find Brentwood, Antioch, Pittsburg, and Clayton, where town lots give way to larger tracts. About 1,155,025 people call Contra Costa County home (Census estimate, 2023) across roughly 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 Brentwood.
Offices that can help
Anything recorded against property around Antioch sit in the index kept by the County Recorder, sometimes only in person. Building or septic questions for a lot near Antioch are for the local planning and health departments, depending on whether the land is inside town limits.
Frequently asked
Are parcel lines on the map exact around Danville?
The map near Brentwood isn't a survey; get a survey before a fence.
Is the Oakley GIS map free?
It depends, but the county viewer covering Oakley needs no account, though printing may be limited.
How current is the parcel data around Concord?
It depends, but owner data near Pittsburg can lag new deeds by weeks, so check the deed index.
Can I see aerial photos on the map near Danville?
Aerials near Danville are usually available as a basemap; availability varies.
What's the tax parcel number used for near Brentwood?
It's the number the County Assessor uses to track a tract near Danville; you'll see it in the viewer and on tax statements.
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.