Blog · October 14, 2026 · California
Concord Plat Map, California: plats and lots
A recorded plat shows how land near Lafayette was divided into lots.
Main page: Contra Costa County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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When a deed near Walnut Creek says lot and block, look up the Concord plat map it refers to. What this Concord guide covers: where plats are filed, plat versus tax map, and what to look for on the sheet.
Who keeps the Concord plat map
For a subdivision near Clayton, look for the plat book reference on the parcel record; bring that to the recorder's office or its online index.
The free map to start with
Go first to the Contra Costa County parcel viewer; it covers each tax parcel in the county, Clayton included. Out toward Walnut Creek, put in a street address, an owner's name or a parcel number, and the viewer zooms to the match. Closer to Walnut Creek, write down the parcel ID from that panel; every clerk in the county asks for it first.
Using it on a phone
Most viewers work in a phone browser, which helps when you're standing on land near Pleasant Hill, but coverage can be spotty out of town. A screenshot of the parcel near Pleasant Hill with its ID keeps working without signal.
City limits and county records
Concord is part of Contra Costa County, California, so its parcels are on the county's map. With a lot near Walnut Creek, the municipality handles things like zoning, permits and utilities for lots inside the boundary, while the county keeps the tax map. Land beyond the city limits near Clayton usually follows county rules instead.
Offices that can help
Recorded documents for a parcel near Pleasant Hill sit in the index kept by the County Recorder, often with an online index. Building or septic questions for a lot near Lafayette are for the local planning and health departments, and the answer depends on jurisdiction.
Two different maps
If the tax map and plat differ near Pittsburg, the recorded plat and a survey control.
Land on the county line
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. A tract near the line by Pleasant Hill can show up across two assessors' files, so check the neighboring map before you assume the acreage. For a home near Martinez, our state page lists each neighboring county map for California.
Replats and vacations
Lots near Clayton can be combined or reconfigured by a replat, search the index for replats of the same subdivision; vacated streets or alleys also get recorded.
The paper trail behind a parcel
For anything that matters, request the recorded deed through the County Recorder; the parcel map near Pleasant Hill only summarizes it. Older tracts near Pleasant Hill can go back through several deeds, so a title company can sort it out before a purchase.
Reading the plat sheet
Recorded easements around Pittsburg can block a shed or pool; read the notes on the sheet.
Sections, lots and bearings
California follows the Public Land Survey System, so deeds around Martinez reference sections and townships. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though real sections near Pleasant Hill vary in size. Write down the legal description for the tract near Lafayette when you talk to a surveyor.
Contra Costa County in a few facts
Martinez holds the county offices, which is where the courthouse records live. Other places on the map include Pleasant Hill, Clayton, and Walnut Creek. Around 1,155,025 people live in Contra Costa County (Census estimate, 2023) spread over about 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 Martinez.
Land outside a subdivision
Rural land near Pleasant Hill that was never subdivided is often described by metes and bounds or survey description; the deed and any recorded survey describe it instead.
Online indexes and office visits
For a home near Pleasant Hill, some counties put plat images online, otherwise call or visit with the reference; small fees are common.
Limits of the parcel data
The acreage figure is a tax-roll number; only a licensed surveyor can set the real boundary on land around Lafayette. In and around Clayton, records update in batches, so a deed recorded last month might lag behind.
Quick answers
What do the dashed lines on a plat mean in Concord?
Building on an easement near Pittsburg is generally restricted, so check before you build.
What does lot 7, block 3 mean near Walnut Creek?
For property near Lafayette, the description sends you to a specific recorded plat, so pull that plat for dimensions.
Is a plat map a survey near Lafayette?
Generally, the plat near Pittsburg is recorded, while the GIS layer is an approximation; a surveyor ties it to the ground.
Who has recorded plats for land near Pittsburg?
Short answer: recorded plats near Walnut Creek are filed with the County Recorder; use the plat reference from the deed or parcel record.
What's a legal description for land near Walnut Creek?
For land near 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.