Blog · October 14, 2026 · California
Using the Millbrae Plat Map
Lots in Millbrae trace back to recorded plats filed with the county.
Main page: San Mateo County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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When a listing near Pacifica mentions a lot number, look up the Millbrae plat map it refers to. This Millbrae guide covers: where plats are filed, plat versus tax map, and what to look for on the sheet.
Getting started with the Millbrae plat map
For a lot in Millbrae, the deed or parcel record often names the subdivision and plat reference; use it to request a copy.
Where the parcel data lives
Begin with the San Mateo County parcel viewer; it includes each tax parcel from Pacifica to South San Francisco. Closer to South San Francisco, enter a street address, an owner's name or a parcel number, and the viewer zooms to the match. If the land is near Brisbane, the record panel typically gives the owner of record, assessed acreage, the parcel number and sometimes recent sales.
Land on the county line
San Mateo County borders Alameda County, San Francisco County, Santa Clara County, and Santa Cruz County; every one of them runs a separate parcel map. A tract near the line by Pacifica can be split across two assessors' files, so check the adjacent map before you assume the acreage. For land near South San Francisco, our state page links every neighboring county map for California.
When there's no plat
Acreage around Brisbane outside a subdivision is often described by metes and bounds or survey description; look for a recorded survey for land near Burlingame.
City limits and county records
Millbrae is part of San Mateo County, California, so its parcels are on the county's map. For acreage around Hillsborough, City or town hall handles things like zoning, permits and utilities within town limits, but the county runs assessment and recording. Acreage past the city limits near Burlingame usually follows county rules rather than the town's.
Legal descriptions in California
California uses the Public Land Survey System, so deeds around Brisbane reference sections and townships. A standard section is about one square mile, roughly 640 acres, and a township holds 36 of them, though sections near Pacifica can be irregular. Write down the legal description for the tract near Pacifica for any title or survey request.
Two different maps
If the tax map and plat differ near Brisbane, go with the plat and a surveyor's work.
Before you lean on the lines
Acreage on the record is a tax-roll number; only a licensed surveyor sets the real lines for a parcel near South San Francisco. For a parcel near Pacifica, owner names and values update on a schedule, so a deed recorded last month may not show yet.
Taking the map into the field
The parcel map usually runs in a mobile browser, useful out on a road near Hillsborough, but coverage can be spotty out of town. A saved image of the lot near Pacifica and its lines keeps working without signal.
Reading the plat sheet
Recorded easements around Pacifica can block a shed or pool; check the plat notes and any covenants.
A quick look at the area
Redwood City holds the county offices, where most land records are kept. Smaller places on the map include Burlingame, San Bruno, Hillsborough, and South San Francisco, where town lots give way to larger tracts. About 726,353 people call San Mateo County home (Census Bureau estimate, 2023) spread over roughly 449 square miles. Places such as Don Edwards San Francisco Bay National Wildlife Refuge are easy to spot when you zoom out from Hillsborough.
Ordering the Millbrae plat map
With a lot near Pacifica, many recorder offices offer an online index, otherwise call or visit with the reference; small fees are common.
The paper trail behind a parcel
The map is an index, not the title: recorded deeds, subdivision plats and easements for land near Brisbane are kept by the County Recorder. Inherited tracts near South San Francisco can trace back through many deeds, and a title company can sort it out on a real sale.
Getting answers from the right desk
Questions about value or the owner field for land near Brisbane belong with the County Assessor, since that office keeps the assessment data. Building or septic questions for a lot near South San Francisco go to planning, building or health offices, depending on whether the land is inside town limits.
Replats and vacations
Lots near Burlingame can be combined or reconfigured by a replat, search the index for replats of the same subdivision; vacated streets or alleys also get recorded.
Millbrae: common questions
Where can I find the Millbrae plat map?
It depends, but recorded plats near San Bruno are filed with the County Recorder; small copy fees are common.
What do the dashed lines on a plat mean around San Bruno?
Building on an easement near South San Francisco is generally restricted, so check before you build.
Is the Millbrae plat map the same as the county GIS?
For a parcel near Brisbane, a recorded plat is based on a survey, but the GIS map is not; trust the plat when they differ.
How do I read lot and block in Millbrae?
For most people, it points to a spot on the plat for that subdivision near Hillsborough.
How is land described in California deeds in Millbrae?
In and around Hillsborough, deeds use lot and block, metes and bounds or survey descriptions; copy it for any survey or title request.
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.