Blog · October 14, 2026 · California
Using the Pittsburg Plat Map
Lots in Pittsburg 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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When a listing near Concord mentions a lot number, the Pittsburg plat map is where those numbers come from. What this Pittsburg guide covers: where to request a copy, how a plat differs from a parcel map, and what to look for on the sheet.
Tracking down the Pittsburg plat map
For land around Concord, the deed usually cites the plat; use it to request a copy.
Pulling up a parcel
Go first to the Contra Costa County parcel viewer; it maps every assessed parcel in the county, Pleasant Hill included. For a tract near Concord, type a street address, an owner's name or a parcel number, and the matching parcel lights up. Out toward Pleasant Hill, a pop-up or side panel typically gives the owner of record, acreage on the tax roll, the parcel number and sometimes recent sales.
Where the recorded documents are
When the details count, get the recorded deed from the County Recorder; the parcel map near Concord only summarizes it. Closer to Concord, have ready the instrument number listed on the parcel record so staff can find the deed fast.
Where Pittsburg fits in
Pittsburg is part of Contra Costa County, California, and the county assessor maps its lots. On ground around Antioch, 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 toward Pleasant Hill often answers to county rules rather than the town's.
Legal descriptions in California
California uses the Public Land Survey System, so deeds around Pleasant Hill reference sections and townships. Each section is nominally a mile square, about 640 acres, with 36 sections to a township, though sections near Clayton can be irregular. Copy the legal description from the record for the parcel near Walnut Creek before you request a deed or survey.
Land outside a subdivision
Acreage around Pleasant Hill outside a subdivision is often described by metes and bounds or survey description; the deed and any recorded survey describe it instead.
Two different maps
If the tax map and plat differ near Concord, trust the recorded documents over the GIS layer.
Using it on a phone
The parcel map usually runs in a mobile browser, useful out on a road near Antioch, though signal can drop in rural spots. A screenshot of the parcel near Antioch with its ID helps when you meet an owner or agent.
Details on the Pittsburg plat map
Easements on the plat near Walnut Creek can block a shed or pool; check the plat notes and any covenants.
Contra Costa County in a few facts
Martinez serves as the county seat, where most land records are kept. Smaller places on the map include Clayton, Antioch, Concord, and Pleasant Hill, where town lots give way to larger tracts. Around 1,155,025 people call Contra Costa County home (Census estimate, 2023) spread over some 717 square miles. Features like Clayton-Marsh Creek-Greenville Fault, San Pablo Dam Reservoir, and Mount Diablo State Park help you orient on the aerial around Oakley.
Replats and vacations
Lots near Walnut Creek can be combined or reconfigured by a replat, so check for later filings; vacated streets or alleys also get recorded.
Requesting the plat
Closer to Oakley, some counties put plat images online, otherwise call or visit with the reference; small fees are common.
Offices that can help
Anything recorded against property around Clayton sit in the index kept by the County Recorder, often with an online index. Zoning, permits and septic questions near Walnut Creek are for the local planning and health departments, depending on whether the land is inside town limits.
Limits of the parcel data
Tax maps are drawn for assessment, not measured on the ground, so a fence near Antioch often sits a few yards off the line on screen. For property near Pleasant Hill, owner names and values update on a schedule, so a deed recorded last month might lag behind.
Neighboring parcel maps
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. A tract near the line by Oakley can show up across two assessors' files, so check the adjacent map before you assume the acreage. With a lot near Concord, the Platbookmapper state page lists every bordering county map for California.
Frequently asked
What does lot 7, block 3 mean near Pleasant Hill?
Good question; it points to a spot on the plat for that subdivision near Oakley, so pull that plat for dimensions.
What is a replat in Pittsburg?
Good question; combining or splitting lots near Antioch usually needs a recorded plat change, often with a surveyor's drawing.
Is a plat map a survey near Clayton?
For a parcel near Oakley, GIS parcels are tax drawings, and the recorded plat is the legal document; trust the plat when they differ.
Do easements show on the plat near Walnut Creek?
In most cases, building on an easement near Pleasant Hill is generally restricted; read the plat notes.
Where is the legal description for land near Antioch?
Near Concord, 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.