Blog · October 14, 2026 · California
Using the Hillsborough Zoning Map
A parcel's zoning district shapes building, splitting and business use near Millbrae.
Main page: San Mateo County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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If you have a specific use in mind for land near San Bruno, pull up the Hillsborough zoning map early: the zoning district can make or break the plan. This town guide covers: who controls zoning for a given parcel, how to match a parcel to its district, and when a variance or rezoning comes up for land near East Palo Alto.
Getting started with the Hillsborough zoning map
Within municipal limits, the local government adopts its own zoning map, so property inside Hillsborough answers to that map. Outside those limits, near Burlingame or Belmont, county rules apply where they exist; the county planning or zoning office can confirm. The quickest way to tell which applies: look for a city limits layer in the San Mateo County parcel viewer.
Where the parcel data lives
Your first stop is the San Mateo County parcel viewer; it maps each tax parcel around San Mateo and Millbrae. If you're looking near San Bruno, enter a street address, an owner's name or a parcel number, and the matching parcel lights up. For land near Millbrae, the record panel typically gives the owner of record, assessed acreage, a parcel ID and sometimes recent sales.
City limits and county records
Hillsborough lies within San Mateo County, California, so its parcels are on the county's map. For acreage around San Bruno, the municipality handles things like zoning, permits and utilities for lots inside the boundary, and the county still keeps the parcel and deed records. Lots just outside the city limits near Millbrae generally follows county rules rather than the town's.
Matching a lot to the Hillsborough zoning map
Some planning offices post the Hillsborough zoning map as a PDF; if you can't find it, ask staff for the district by parcel number. For a home near Belmont, district codes like R-1, C-2 or A-1 point to a table of rules in the ordinance; the letters vary from place to place.
Questions for the planning office
Have the parcel ID ready and describe the plan for the lot near San Bruno; staff can point to the right section of the ordinance. Ask whether a parcel near San Bruno meets current minimum size, because nonconforming lots can carry limits.
Permits after zoning
Even when zoning allows a use near San Bruno, a building permit is a separate step; health and road departments may weigh in on land near Burlingame.
Reading the ordinance
On ground around Foster City, the ordinance spells out uses allowed by right, uses needing a permit, and uses not allowed. With a lot near San Mateo, overlay districts, such as floodplain, historic or airport zones, can add rules on top of the base district.
Asking for an exception
When a project near San Bruno falls outside the rules, ask about a variance, a conditional use permit or a rezoning.
When a parcel crosses a boundary
San Mateo County borders Alameda County, San Francisco County, Santa Clara County, and Santa Cruz County, and each of those keeps its own parcel map. Acreage along the edge near Foster City may show up across two assessors' files, so check the adjacent map as well. Near San Mateo, the Platbookmapper state page lists every bordering county map for California.
Who handles what
If the acreage or value on a parcel near Millbrae looks off are handled by the County Assessor, since that office keeps the assessment data. Questions about what you can build around Belmont need the planning or permitting office, depending on whether the land is inside town limits.
Backing up the map with records
Before you sign anything, pull the recorded deed from the County Recorder; the parcel map near Burlingame only summarizes it. For acreage around Belmont, have ready the document number shown in the record panel and the lookup takes minutes.
Sections, lots and bearings
California uses the Public Land Survey System, so rural legal descriptions near San Mateo cite section, township and range. A standard section is about one square mile, roughly 640 acres, and a township holds 36 of them, though corrections make some sections near San Bruno odd-sized. Copy the legal description from the record for the parcel near Millbrae for any title or survey request.
Using it on a phone
Most viewers work in a phone browser, handy when you're parked on a road near San Mateo, but coverage can be spotty out of town. A saved image of the lot near Millbrae and its lines helps when you meet an owner or agent.
Hillsborough: common questions
Can I get an exception to a setback near San Bruno?
Good question; boards in Hillsborough grant variances only when strict rules cause a real hardship; ask staff about the standards.
Is land outside Hillsborough zoned?
For most people, land beyond Hillsborough limits usually follows county rules, if any; confirm with the county office.
Where is the Hillsborough zoning map?
Start with the parcel record, then check the adopted zoning map for the town; many towns post the map online, especially near Redwood City.
Can I run a business from home in Hillsborough?
Short answer: home businesses in this town are often allowed with conditions, so check before you start, especially near East Palo Alto.
How do I save a parcel from the viewer for land near Foster City?
Some viewers offer PDF export, and it's worth keeping the parcel ID visible for land near San Bruno.
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.