Blog · October 14, 2026 · California
Using the Foster City GIS Map
Parcel data for the city comes from the county, and the viewer is free around Burlingame.
Main page: San Mateo County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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For a parcel in or near Foster City, a look at the Foster City GIS map gives you lines, owner names and parcel numbers. Covered here for Foster City: where that map lives, the fastest ways to search, and what to double-check with records.
Where the Foster City GIS map lives
Near Burlingame, some cities also run their own GIS portal for utilities or zoning; that can add detail on top of the county map.
Opening the official parcel viewer
Parcels around San Carlos are published on the San Mateo County parcel viewer, which opens without registering. With a lot near Redwood City, put in a street address, an owner's name or a parcel number, and the matching parcel lights up. If you're looking near San Mateo, the parcel card normally shows the owner of record, acreage on the tax roll, a parcel ID and in many cases the last transfer.
A word on accuracy
Listed acreage is an estimate; just a licensed surveyor establishes the real boundary for a parcel near San Mateo. With a lot near Hillsborough, owner names and values update on a schedule, so a deed recorded last month might lag behind.
Places you'll see on the map
Redwood City serves as the county seat, home to the main records offices. Other places on the map include San Mateo, Belmont, and San Carlos. Around 726,353 people call San Mateo County home (Census estimate, 2023) spread over some 449 square miles. Landmarks such as Don Edwards San Francisco Bay National Wildlife Refuge are easy to spot when you zoom out from Hillsborough.
Backing up the map with records
Before you sign anything, pull the recorded deed from the County Recorder; the parcel map near San Mateo only summarizes it. For acreage around San Carlos, have ready the document number listed on the parcel record and the lookup takes minutes.
Foster City and the county around it
The city lies within San Mateo County, California, and the county assessor maps its lots around Belmont. In and around San Mateo, the municipality handles matters such as zoning, permits and utilities for lots inside the boundary, but the county runs assessment and recording. Acreage past the town limits near San Carlos generally answers to county rules, not municipal ones.
Three ways to find a parcel
Addresses are the easiest route inside Foster City; owner names are usually entered last name first. Around Redwood City, searching by parcel number never misses, and you'll find it on tax statements.
What the layers show
For land near Burlingame, layer lists often include zoning, flood zones, city limits, school districts or contours; 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 Redwood City, so load it before you lose signal. A screenshot of the parcel near Burlingame with its ID helps when you meet an owner or agent.
Reading the legal description
California uses the Public Land Survey System, so deeds around Hillsborough reference sections and townships. Each section is nominally a mile square, about 640 acres, with 36 sections to a township, though real sections near Belmont vary in size. Keep the legal description for land near Hillsborough for any title or survey request.
Browser tips
If the viewer stalls on a phone near Belmont, try a desktop browser or clear the cache; links occasionally change, and our directory page keeps the current one.
Land on the county line
San Mateo County touches Alameda County, San Francisco County, Santa Clara County, and Santa Cruz County, and each of those keeps its own parcel map. Ground near Hillsborough that runs to the line may be split across two assessors' files, so open the adjacent map too. In and around Redwood City, our state page lists every neighboring county map for California.
Offices that can help
Recorded documents for a parcel near San Mateo are with the County Recorder, often with an online index. Questions about what you can build around San Mateo need the planning or permitting office, and the answer depends on jurisdiction.
Reading a parcel record
If sale dates appear, they help gauge the market around San Mateo give a rough idea of values; an appraiser is the real authority.
Saving what you find
Print or screenshot the parcel near Hillsborough with its ID visible, which helps later when you ask the assessor or a title company.
Foster City: common questions
Can I search by owner name in Foster City?
Good question; the parcel record for a lot near Redwood City lists the owner of record, or search by address instead.
Where else can I find maps of Foster City?
In most cases, Foster City may publish zoning or utility maps separately, while parcel data usually comes from the county.
How current is the parcel data in Foster City?
For land near San Mateo, updates come in batches.
Is the city GIS map free near Redwood City?
In most cases, the county viewer covering Foster City needs no account; some sites ask you to accept a disclaimer.
Who do I call about a parcel near Redwood City?
For land near Hillsborough, assessment goes to the County Assessor and deeds to the County Recorder.
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.