Blog · October 14, 2026 · California
Hillsborough GIS Map, California: a how-to
Parcel data for Hillsborough 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 Foster City catches your eye, the Hillsborough GIS map lays out the outline, the owner of record and a parcel ID. What this Hillsborough guide covers: which viewer to open, how to search it, and what to double-check with records.
Opening the Hillsborough GIS map
For acreage around Foster City, 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
Begin with the San Mateo County parcel viewer; it covers every assessed parcel around Millbrae and Burlingame. Closer to Millbrae, type a street address, an owner's name or a parcel number, then pick the result to center the map on it. On ground around Burlingame, a pop-up or side panel usually lists the owner of record, assessed acreage, the parcel number and often a sale date.
Neighboring parcel maps
San Mateo County meets Alameda County, San Francisco County, Santa Clara County, and Santa Cruz County, all with their own assessor records. Ground near Millbrae that runs to the line can be split across two assessors' files, so check the neighboring map too. If you're looking near San Mateo, our state page lists each neighboring county map for California.
San Mateo County in a few facts
Redwood City serves as the county seat, which is where the courthouse records live. Other places on the map include Burlingame, San Mateo, Millbrae, and Belmont. Around 726,353 people live in San Mateo County (Census estimate, 2023) across about 449 square miles. Places such as Don Edwards San Francisco Bay National Wildlife Refuge are easy to spot when you zoom out from San Mateo.
Saving what you find
Save a screenshot of the lot near San Mateo and its record panel, which helps later when you ask the assessor or a title company.
Browser tips
If the viewer stalls on a phone near Burlingame, try a desktop browser or clear the cache; links occasionally change, and our directory page keeps the current one.
Which office to call
Deeds, mortgages and recorded plats for land near Burlingame are with the County Recorder, often with an online index. Questions about what you can build around Foster City are for the local planning and health departments, depending on whether the land is inside town limits.
Legal descriptions in California
California follows the Public Land Survey System, so rural legal descriptions near Belmont cite 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 Millbrae vary in size. Keep the legal description for land near Foster City before you request a deed or survey.
City limits and county records
Hillsborough is part of San Mateo County, California, so its parcels are on the county's map. For a parcel near Foster City, City or town hall handles matters such as zoning, permits and utilities inside its limits, and the county still keeps the parcel and deed records. Lots just outside the town limits out by San Mateo usually answers to county rules, not municipal ones.
Recorded documents worth pulling
The map is an index, not the title: deeds, plats and easements for parcels in the county are kept by the County Recorder. For property near Millbrae, have ready the book and page from the tax record so staff can find the deed fast.
Field tips
Most viewers work in a phone browser, which helps when you're standing on land near Foster City, though signal can drop in rural spots. A saved image of the lot near San Bruno and its lines is a good backup.
Finding the right lot
Vacant ground near Foster City may lack an address, so zoom in from the nearest road and click the outline. Around Belmont, a parcel ID is the most reliable search, and it's printed on tax bills.
Beyond the parcel lines
For acreage around Belmont, layer lists often include zoning, flood zones, city limits, school districts or contours; not every viewer has them all.
Owner, value and acreage
Recent sales on nearby lots in Hillsborough give a rough idea of values; an appraiser is the real authority.
Before you lean on the lines
The acreage figure is an assessed number; only a licensed surveyor establishes the real corners for a parcel near San Mateo. Owner names and values update on a schedule, so a recent sale near Foster City can take weeks to appear.
Hillsborough: common questions
Can I search by owner name in Hillsborough?
It depends, but click the lot near San Bruno to see the owner.
What layers does the parcel viewer have for land near Belmont?
For most people, aerials near Millbrae are usually available as a basemap.
Are parcel lines on the map exact for land near San Mateo?
Good question; lines near San Mateo can be off by several feet or more, so a licensed surveyor should mark corners.
Where else can I find maps of Hillsborough?
For most people, Hillsborough may publish zoning or utility maps separately, while parcel data usually comes from the county.
Does the parcel map work on a phone near Burlingame?
For a home near San Bruno, most viewers run in a mobile browser; screenshots help offline.
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.