Blog · October 14, 2026 · California
Using the Napa GIS Map
Most property questions near Yountville start with a parcel lookup.
Main page: Napa County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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For any lot around St. Helena, the Napa GIS map lays out the outline, the owner of record and a parcel ID. What this Napa guide covers: where that map lives, the fastest ways to search, and the limits worth knowing.
Opening the Napa GIS map: start here
With a lot near Calistoga, some cities also run their own GIS portal for utilities or zoning; that can add detail on top of the county map.
Getting to the right map
Begin with the Napa County parcel viewer; it maps each tax parcel in the county, Yountville included. In and around Yountville, enter a street address, an owner's name or a parcel number, and the viewer zooms to the match. On ground around Calistoga, write down the parcel ID before closing the panel; every records desk in the county uses it to find the file.
Which office to call
Deeds, mortgages and recorded plats for land near Yountville are with the County Recorder, often with an online index. Questions about what you can build around Calistoga go to planning, building or health offices, town or county, depending on location.
City limits and county records
Napa lies within Napa County, California, and the county assessor maps its lots. As the county seat, Napa hosts the courthouse, handy when you need recorded documents. For a home near Yountville, the municipality handles matters such as zoning, permits and utilities for lots inside the boundary, but the county runs assessment and recording. Land beyond the city limits out by Yountville often answers to county rules instead.
Searching the map
By address works best for lots in Napa; owner names are usually entered last name first. With a lot near Yountville, searching by parcel number never misses, and you'll find it on tax statements.
Taking the map into the field
The parcel map usually runs in a mobile browser, useful out on a road near Yountville, but coverage can be spotty out of town. A saved image of the lot near Calistoga and its lines keeps working without signal.
When the map won't load
If the viewer stalls on a phone near Calistoga, switch browsers or turn off pop-up blockers; the Platbookmapper county page tracks the current link.
What the layers show
With a lot near Yountville, look in the layer list for city limits, flood hazard, zoning or soils; availability varies.
Saving what you find
Save a screenshot of the lot near St. Helena and its record panel, which helps later when you ask the assessor or a title company.
Reading the legal description
California uses the Public Land Survey System, which means a tract near St. Helena is described by section, township and range. A standard section is about one square mile, roughly 640 acres, and a township holds 36 of them, though real sections near Calistoga vary in size. Copy the legal description from the record for the parcel near American Canyon for any title or survey request.
Land on the county line
Napa County borders Lake County, Solano County, Sonoma County, and Yolo County; every one of them runs a separate parcel map. Acreage along the edge near Calistoga may be split in two county records, so open the neighboring map too. For acreage around American Canyon, the Platbookmapper state page links every bordering county map across California.
A quick look at the area
Napa is the county seat, home to the main records offices. You'll also find Yountville, American Canyon, St. Helena, and Calistoga. About 133,216 people call Napa County home (Census estimate, 2023) across about 748 square miles. Features like Robert Louis Stevenson State Park help you orient on the aerial around Calistoga.
A word on accuracy
Parcel lines are drawn for taxes, not surveyed, so a tree line near Yountville often sits some distance off the line on screen. Owner names and values update on a schedule, so a fresh transfer around Calistoga might lag behind.
What the record panel tells you
Recent sales on nearby lots near Yountville give a rough idea of values; they're not an appraisal.
Backing up the map with records
The map is an index, not the title: deeds, plats and easements covering ground around Calistoga are kept by the County Recorder. Long-held tracts around American Canyon can go back through a long string of deeds, so a title company earns its fee before a purchase.
Quick answers
Can I look up a property owner on the map near Yountville?
It depends, but click the lot near American Canyon to see the owner, or search by address instead.
Where else can I find maps of Napa?
Generally, Napa may publish zoning or utility maps separately; the county viewer remains the main parcel source.
Can I use the Napa GIS map for a fence near Yountville?
For most people, the map near St. Helena isn't a survey.
What layers does the parcel viewer have around American Canyon?
Around Yountville, many viewers offer aerial imagery plus layers like city limits, zoning or flood zones; availability varies.
What's the tax parcel number used for near Yountville?
It's the number the County Assessor uses to track a tract near Yountville; copy it before you call anyone.
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.