Blog · October 14, 2026 · California
The Half Moon Bay GIS Map and the county parcel viewer
Parcel data for Half Moon Bay comes from the county, and the viewer is free.
Main page: San Mateo County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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When land near Millbrae catches your eye, the Half Moon Bay GIS map shows parcel boundaries plus basic tax data. Covered here for Half Moon Bay: which viewer to open, how to search it, and what to double-check with records.
Getting started with the Half Moon Bay GIS map
Around Burlingame, some cities also run their own GIS portal for utilities or zoning; that can add detail on top of the county map.
The viewer San Mateo County publishes
Parcels around San Mateo can be looked up on the San Mateo County parcel viewer, which opens without registering. Closer to Millbrae, type a street address, an owner's name or a parcel number, and the matching parcel lights up. Closer to Burlingame, the record panel typically gives the owner of record, acreage on the tax roll, a parcel ID and sometimes recent sales.
Saving what you find
Save a screenshot of the lot near Hillsborough and its record panel, so you have it when calling an office.
Half Moon Bay, CA: the basics
Half Moon Bay lies within San Mateo County, California, so its parcels are on the county's map. If the land is near San Carlos, City or town hall handles things like zoning, permits and utilities within town limits, while the county keeps the tax map. Acreage past the city limits out by Millbrae often falls under county rules instead.
Which office to call
Anything recorded against property around Belmont are with the County Recorder, often with an online index. Zoning, permits and septic questions near Millbrae are for the local planning and health departments, depending on whether the land is inside town limits.
Backing up the map with records
The map is an index, not the title: recorded deeds, plats and easements for land near Millbrae are filed with the County Recorder. Older tracts near Millbrae may go back through a long string of deeds, so a title company can sort it out if money is changing hands.
When a parcel crosses a boundary
San Mateo County borders Alameda County, San Francisco County, Santa Clara County, and Santa Cruz County, all with their own assessor records. Ground near Burlingame that runs to the line may be split in two county records, so open the adjacent map too. Out toward San Mateo, our state page lists each neighboring county map for California.
What the map can't tell you
Listed acreage is a tax-roll number; only a licensed surveyor sets the real lines for a parcel near Hillsborough. For property near San Carlos, owner names and values update on a schedule, so a deed recorded last month might lag behind.
San Mateo County in a few facts
Redwood City is the county seat, which is where the courthouse records live. Smaller places on the map include Hillsborough, Belmont, Millbrae, and Burlingame, each with its own cluster of lots. Roughly 726,353 people call San Mateo County home (Census estimate, 2023) spread over roughly 449 square miles. Landmarks such as Don Edwards San Francisco Bay National Wildlife Refuge are easy to spot when you zoom out from San Carlos.
Searching the map
Acreage around San Carlos might not have a street number, so zoom in from the nearest road and click the outline. For a parcel near Millbrae, searching by parcel number never misses, and it carries over to every office in the county.
On site with the map
The parcel map usually runs in a mobile browser, which helps when you're standing on land near San Carlos, but coverage can be spotty out of town. A screenshot of the parcel near Belmont with its ID is a good backup.
Aerials, labels and overlays
An aerial view around Burlingame helps you see where buildings sit inside the lines.
Owner, value and acreage
A parcel card near Millbrae normally gives the owner of record, values and a legal description.
Sections, lots and bearings
California follows the Public Land Survey System, which means a tract near Burlingame is described by section, township and range. Each section is nominally a mile square, about 640 acres, and a township holds 36 of them, though real sections near San Mateo vary in size. Write down the legal description for the tract near San Mateo for any title or survey request.
Troubleshooting the viewer
When the map won't open around Burlingame, try a desktop browser or clear the cache; the Platbookmapper county page tracks the current link.
Questions about the Half Moon Bay GIS map
Can I use the Half Moon Bay GIS map for a fence near Burlingame?
In most cases, lines near Hillsborough can be off by several feet or more; get a survey before a fence.
Does Half Moon Bay have its own GIS map?
In most cases, Half Moon Bay may publish zoning or utility maps separately, while parcel data usually comes from the county.
Can I see aerial photos on the map near Hillsborough?
Generally, aerials near Millbrae are usually available as a basemap; open the layer list to see what's there.
Can I search by owner name in Half Moon Bay?
Good question; the parcel record for a lot near Millbrae lists the owner of record.
How do I save a parcel from the viewer in Half Moon Bay?
Most viewers have a print or export tool, and it's worth keeping the parcel ID visible for land near Millbrae.
Open the official San Mateo 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.