Blog · October 17, 2026 · California
Using the St. Helena GIS Map
Parcel data for St. Helena comes from the county, and the viewer is free.
Main page: Napa County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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For any lot around Calistoga, the St. Helena GIS map shows lines, owner names and parcel numbers. In this St. Helena guide: where that map lives, the fastest ways to search, and the limits worth knowing.
Where the St. Helena GIS map lives
A town may publish separate layers for zoning or utilities; ask city hall in St. Helena whether one exists.
The free map to start with
Your first stop is the Napa County parcel viewer; it includes each assessed parcel around American Canyon and Yountville. If you're looking near Napa, type a street address, an owner's name or a parcel number, and the matching parcel lights up. If the land is near American Canyon, write down the parcel ID before closing the panel; each clerk in the county asks for it first.
Where St. Helena fits in
St. Helena sits in Napa County, California, and the county assessor maps its lots. Closer to American Canyon, the municipality handles matters such as zoning, permits and utilities for lots inside the boundary, while the county keeps the tax map. Acreage past the city limits near Napa often follows county rules rather than the town's.
Three ways to find a parcel
Vacant ground near Yountville may lack an address, so zoom in from Interstate 80 and click the outline. With a lot near Napa, a parcel ID is the most reliable search, and it's printed on tax bills.
A word on accuracy
Acreage on the record is a tax-roll number; just a licensed surveyor sets the real corners on land around American Canyon. With a lot near Yountville, owner names and values update on a schedule, so a deed recorded last month might lag behind.
Troubleshooting the viewer
When the map won't open around Yountville, switch browsers or turn off pop-up blockers; links occasionally change, and our directory page keeps the current one.
A quick look at the area
Napa serves as the county seat, where most land records are kept. You'll also find Calistoga, Yountville, and American Canyon. Roughly 133,216 people live in Napa County (Census estimate, 2023) spread over about 748 square miles. Places such as Robert Louis Stevenson State Park make handy reference points on the map near Yountville.
Keeping a record
Save a screenshot of the lot near Yountville and its record panel, which helps later when you ask the assessor or a title company.
The paper trail behind a parcel
For a tract near Calistoga, the map is an index, not the title: deeds, plats and easements for parcels in the county are kept by the County Recorder. If you're looking near Napa, have ready the document number shown in the record panel and the lookup takes minutes.
Legal descriptions in California
California follows the Public Land Survey System, so rural legal descriptions near Yountville 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 American Canyon can be irregular. Keep the legal description for land near Calistoga when you talk to a surveyor.
Getting answers from the right desk
Deeds, mortgages and recorded plats for land near Calistoga sit in the index kept by the County Recorder, usually searchable by name or document number. Questions about what you can build around Calistoga need the planning or permitting office, depending on whether the land is inside town limits.
What the layers show
For land near Yountville, look in the layer list for municipal boundaries, floodplain and sometimes zoning; not every viewer has them all.
Field tips
The parcel map usually runs in a mobile browser, handy when you're parked on a road near Napa, but coverage can be spotty out of town. A printout of the tract near Yountville is a good backup.
Owner, value and acreage
Recent sales on nearby lots in St. Helena are a useful starting point; an appraiser is the real authority.
Next door to Napa County
Napa County touches Lake County, Solano County, Sonoma County, and Yolo County, and each of those keeps its own parcel map. Acreage along the edge near Calistoga may show up across two assessors' files, so check the neighboring map too. Out toward American Canyon, our state page links every neighboring county map for California.
Questions about the St. Helena GIS map
Is the St. Helena GIS map free?
For most people, the Napa County parcel viewer is free and opens without a login, though printing may be limited.
Are parcel lines on the map exact in St. Helena?
Short answer: the map near Napa isn't a survey, so a licensed surveyor should mark corners.
How often is the parcel map updated near Napa?
Updates come in batches.
What layers does the parcel viewer have around Napa?
For a parcel near Yountville, many viewers offer aerial imagery plus layers like city limits, zoning or flood zones.
Why do offices ask for the parcel ID for land near Calistoga?
It's the number the County Assessor uses to track a tract near Calistoga, and it's on the record panel and tax bills.
Open the official Napa 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.