Blog · October 14, 2026 · California
Using the Martinez GIS Map
Parcel data for Martinez 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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For a parcel in or near Martinez, the Martinez GIS map shows lines, owner names and parcel numbers. What this city guide covers: which viewer to open, how to search it, and what to double-check with records, at least around Concord.
Opening the Martinez GIS map
With a lot near Lafayette, some cities also run their own GIS portal for utilities or zoning; that can add detail on top of the county map.
The viewer Contra Costa County publishes
Lots and tracts near Lafayette are published on the Contra Costa County parcel viewer, which opens without registering. For land near Walnut Creek, put in a street address, an owner's name or a parcel number, and the viewer zooms to the match. If you're looking near Orinda, the parcel card typically gives the owner of record, assessed acreage, a parcel ID and sometimes recent sales.
City limits and county records
Martinez is part of Contra Costa County, California, and the county assessor maps its lots. Martinez is also the county seat, handy when you need recorded documents. For a parcel near Orinda, the municipality handles things like zoning, permits and utilities for lots inside the boundary, and the county still keeps the parcel and deed records. Land beyond the town limits near Orinda often answers to county rules instead.
A word on accuracy
Acreage on the record is an estimate; only a licensed surveyor sets the real boundary for a parcel near Hercules. Closer to Concord, owner names and values update on a schedule, so a deed recorded last month might lag behind.
Searching the map
By address works best for lots in Martinez; owner names are usually entered last name first. In and around Orinda, searching by parcel number never misses, and it carries over to every office in the county.
The paper trail behind a parcel
The map is an index, not the title: recorded deeds, plats and easements covering ground around Orinda are kept by the County Recorder. Older tracts near Hercules can sit on a long string of deeds, so a title company is worth hiring before a purchase.
Beyond the parcel lines
On ground around Hercules, look in the layer list for city limits, flood hazard, zoning or soils; availability varies.
Keeping a record
Print or screenshot the parcel near Pleasant Hill with its ID visible, which helps later when you ask the assessor or a title company.
Legal descriptions in California
California uses the Public Land Survey System, so deeds around Hercules reference sections and townships. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though sections near Orinda can be irregular. Write down the legal description for the tract near Hercules before you request a deed or survey.
What the record panel tells you
Sales history, if listed, helps with pricing in this city give a rough idea of values; they're not an appraisal, especially near El Cerrito.
Field tips
Most viewers work in a phone browser, which helps when you're standing on land near Hercules, but coverage can be spotty out of town. A screenshot of the parcel near Orinda with its ID helps when you meet an owner or agent.
Places you'll see on the map
Martinez is the county seat, where most land records are kept. Other places on the map include Pleasant Hill, Concord, Lafayette, and Walnut Creek. About 1,155,025 people live in Contra Costa County (Census Bureau estimate, 2023) spread over about 717 square miles. Places such as Clayton-Marsh Creek-Greenville Fault, San Pablo Dam Reservoir, and Mount Diablo State Park make handy reference points on the map near Walnut Creek.
Neighboring parcel maps
Contra Costa County touches Alameda County, Marin County, Sacramento County, San Francisco County, and San Joaquin County, and each of those keeps its own parcel map. Ground near Orinda that runs to the line may be split across two assessors' files, so open the neighboring map as well. With a lot near Walnut Creek, the Platbookmapper state page lists each neighboring county map for California.
Who handles what
Anything recorded against property around Pleasant Hill sit in the index kept by the County Recorder, sometimes only in person. Zoning, permits and septic questions near Hercules need the planning or permitting office, town or county, depending on location.
Browser tips
When the map won't open around Orinda, try a desktop browser or clear the cache; the Platbookmapper county page tracks the current link.
Frequently asked
Can I search by owner name around Concord?
In most cases, the parcel record for a lot near Walnut Creek lists the owner of record.
Is the Martinez GIS map free?
In most cases, the county viewer covering Martinez needs no account, though printing may be limited.
Are parcel lines on the map exact for land near Concord?
In most cases, lines near Orinda can be off by several feet or more, so a licensed surveyor should mark corners.
How current is the parcel data for land near Walnut Creek?
Generally, updates come in batches.
Does the parcel map work on a phone in Martinez?
Most viewers run in a mobile browser; load it before you lose coverage near Concord.
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.