Blog · October 14, 2026 · California
Oakley Plat Map: finding the recorded plat
Lots in Oakley trace back to recorded plats filed with the county.
Main page: Contra Costa County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Buying a lot in a subdivision near Danville? What you want is the Oakley plat map, because the recorded plat shows how the land was divided. What this Oakley guide covers: where to request a copy, how a plat differs from a parcel map, and the details that matter to buyers.
The Oakley plat map: start here
For a lot in Oakley, the deed usually cites the plat; that makes the request quick.
The free map to start with
Begin with the Contra Costa County parcel viewer; it maps each tax parcel in the county, Antioch included. Around Pittsburg, put in a street address, an owner's name or a parcel number, and the matching parcel lights up. In and around Brentwood, the parcel card normally shows the owner of record, assessed acreage, the parcel number and often a sale date.
Oakley, CA: the basics
Oakley sits in Contra Costa County, California, which means parcel data comes from the county. For land near Pittsburg, city or town hall handles matters such as zoning, permits and utilities within town limits, while the county keeps the tax map. Acreage past the city limits near Antioch generally answers to county rules rather than the town's.
How a plat differs from the tax map
If the tax map and plat differ near Brentwood, trust the recorded documents over the GIS layer.
Field tips
Most viewers work in a phone browser, handy when you're parked on a road near Concord, but coverage can be spotty out of town. A screenshot of the parcel near Pittsburg with its ID keeps working without signal.
Sections, lots and bearings
California is laid out under the Public Land Survey System, so deeds around Danville 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 Clayton can be irregular. Write down the legal description for the tract near Antioch when you talk to a surveyor.
Places you'll see on the map
Martinez holds the county offices, which is where the courthouse records live. You'll also find Brentwood, Antioch, Pittsburg, and Clayton, each with its own cluster of lots. About 1,155,025 people call Contra Costa County home (Census estimate, 2023) on roughly 717 square miles. Places such as Clayton-Marsh Creek-Greenville Fault, San Pablo Dam Reservoir, and Mount Diablo State Park are easy to spot when you zoom out from Concord.
When a plat changes
Lots near Brentwood can be combined or reconfigured by a replat, so check for later filings; street vacations near Antioch show up in the records too.
Metes and bounds instead
Acreage around Danville outside a subdivision is often described by metes and bounds or survey description; look for a recorded survey for land near Concord.
The paper trail behind a parcel
The map is an index, not the title: deeds, subdivision plats and easements covering ground around Danville sit with the County Recorder. Inherited tracts around Concord may sit on several deeds, so a title company is worth hiring if money is changing hands.
Reading the plat sheet
Around Pittsburg, the sheet usually includes lot and block numbers, dimensions and bearings, street rights-of-way and easements.
Requesting the plat
In and around Clayton, some counties put plat images online, otherwise call or visit with the reference; small fees are common.
Who handles what
Questions about value or the owner field for land near Pittsburg belong with the County Assessor, since that office keeps the assessment data. Building or septic questions for a lot near Clayton are for the local planning and health departments, and the answer depends on jurisdiction.
Next door to Contra Costa County
Contra Costa County meets Alameda County, Marin County, Sacramento County, San Francisco County, and San Joaquin County, and each of those keeps its own parcel map. Ground near Danville that runs to the line can show up across two assessors' files, so check the neighboring map as well. For property near Clayton, the Platbookmapper state page links every bordering county map across California.
Before you lean on the lines
Listed acreage is a tax-roll number; just a licensed surveyor sets the real boundary for a parcel near Concord. For acreage around Antioch, owner names and values update on a schedule, so a deed recorded last month might lag behind.
Quick answers
How do I get a copy of a plat around El Cerrito?
For most people, recorded plats near Danville are filed with the County Recorder; use the plat reference from the deed or parcel record.
Where are historic plats for Oakley?
Generally, older plats near Clayton may be on film or paper; call before you visit.
How do I split a lot in Oakley?
Generally, lot splits in Oakley go through the planning office; ask staff about the process.
How is a plat different from the parcel map near Concord?
The plat near Danville is recorded, while the GIS layer is an approximation; a surveyor ties it to the ground.
What's the tax parcel number used for in Oakley?
Every office uses it to pull the same file for land near Danville, and it's on the record panel and tax bills.
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.