Blog · October 14, 2026 · California
Reading the Moraga Plat Map for a lot
Lots in Moraga 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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Checking easements on a house in Moraga? Start with the Moraga plat map, since it shows lots, streets and easements as approved. Covered here for Moraga: where plats are filed, how a plat differs from a parcel map, and the details that matter to buyers.
The Moraga plat map: start here
Closer to Orinda, recorded plats sit with the County Recorder, usually in a plat book or cabinet.
Where the parcel data lives
Your first stop is the Contra Costa County parcel viewer; it maps each tax parcel in the county, Orinda included. For land near Pleasant Hill, type a street address, an owner's name or a parcel number, then pick the result to center the map on it. In and around Walnut Creek, the parcel card typically gives the owner of record, assessed acreage, the parcel number and often a sale date.
City limits and county records
Moraga is part of Contra Costa County, California, and the county assessor maps its lots. Around Martinez, 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. Acreage past the town limits near Orinda usually answers to county rules rather than the town's.
Two different maps
When the two disagree for a lot near Lafayette, the recorded plat and a survey control.
Lots, blocks and easements
Around Walnut Creek, the sheet usually includes lot and block numbers, dimensions and bearings, street rights-of-way and easements.
When a plat changes
An amended plat may change lots around Martinez, search the index for replats of the same subdivision; street vacations near Danville show up in the records too.
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 may show up across two assessors' files, so look at the neighboring map before you assume the acreage. For acreage around Pleasant Hill, the Platbookmapper state page links every neighboring county map across California.
Backing up the map with records
The map is an index, not the title: deeds, plats and easements covering ground around Pleasant Hill are kept by the County Recorder. For a tract near Walnut Creek, have ready the instrument number from the tax record to skip a name search.
On site with the map
The parcel map usually runs in a mobile browser, handy when you're parked on a road near Danville, so load it before you lose signal. A printout of the tract near Pleasant Hill helps when you meet an owner or agent.
What the map can't tell you
Acreage on the record is an estimate; only a licensed surveyor can set the real corners on land around Lafayette. Out toward Walnut Creek, records update in batches, so a deed recorded last month can take weeks to appear.
Getting answers from the right desk
Questions about value or the owner field for land near Orinda belong with the County Assessor, the office behind the parcel record. Zoning, permits and septic questions near Martinez go to planning, building or health offices, depending on whether the land is inside town limits.
Sections, lots and bearings
California uses the Public Land Survey System, so rural legal descriptions near Pleasant Hill cite section, township and range. Each section is nominally a mile square, about 640 acres, and a township holds 36 of them, though sections near Orinda can be irregular. Keep the legal description for land near Martinez before you request a deed or survey.
Places you'll see on the map
Martinez is the county seat, home to the main records offices. Other places on the map include Lafayette, Orinda, Walnut Creek, and Pleasant Hill, each with its own cluster of lots. Roughly 1,155,025 people call Contra Costa County home (Census estimate, 2023) across about 717 square miles. Features like Clayton-Marsh Creek-Greenville Fault, San Pablo Dam Reservoir, and Mount Diablo State Park are easy to spot when you zoom out from Orinda.
Getting a copy
If you're looking near Danville, many recorder offices offer an online index, while others require a visit or a request; small fees are common.
When there's no plat
Rural land near Martinez that was never subdivided may have no plat at all; the deed and any recorded survey describe it instead.
Quick answers
Are old plats online for land near Danville?
For a parcel near Orinda, it varies; some offices have scanned older plats and some haven't.
How is a plat different from the parcel map near Orinda?
Short answer: the plat near Danville is recorded, while the GIS layer is an approximation.
Where can I find the Moraga plat map?
For land near Lafayette, copies come from the County Recorder, often through an online index; use the plat reference from the deed or parcel record.
What is a lot and block description in Moraga?
For acreage around Martinez, lot and block refer to a numbered lot within a block on a recorded subdivision plat.
Why do offices ask for the parcel ID near Walnut Creek?
It's the number the County Assessor uses to track a tract near Lafayette; 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.