Hillsborough is an incorporated town in San Mateo County, California.
San Mateo County · town
Hillsborough
Hillsborough is an incorporated town in San Mateo County, in the San Francisco Bay Area. About 10,883 residents (2023 Census estimate). 6.17 sq mi of land. Verify city vs county jurisdiction on the APN. Screen any APN in or near Hillsborough for zoning, FEMA flood, CAL FIRE / WUI wildfire hazard, soils, geology, and planning — every finding linked to the official source — then verify with Hillsborough or San Mateo County planning before you buy or entitle.
Updated 2026-08-29
Useful sources for searching Hillsborough: Official sources to verify buildability in Hillsborough ↓
About Hillsborough land diligence
Hillsborough is an incorporated town in San Mateo County, in the San Francisco Bay Area. About 10,883 residents (2023 Census estimate). 6.17 sq mi of land. Verify city vs county jurisdiction on the APN.
Confirm whether the lot is inside Hillsborough limits or unincorporated San Mateo County, then verify zoning on the official planning site. Most deals need both a fast multi-layer screen and a follow-up with local planners—especially where city limits, specific plans, hillside fire standards, or floodplain rules apply.
Search intents this page answers: zoning in Hillsborough, FEMA flood near Hillsborough, CAL FIRE hazard severity, APN lookup, and whether a vacant lot is buildable before you spend on surveys or design.
Community snapshot
Character: Incorporated town in San Francisco Bay Area.
Population: about 10,883 residents (2023 estimate) across roughly 6.166 square miles.
Climate: Peninsula Mediterranean — cool coast, warmer inland.
Growth outlook: Hillsborough has about 10,883 residents in recent Census estimates; growth and housing capacity still hinge on General Plan / Housing Element updates and infrastructure — confirm with Hillsborough city/town planning (or San Mateo County if the APN is outside city limits).
Jurisdiction check: confirm whether the APN is inside Hillsborough limits or unincorporated San Mateo County before relying on city zoning maps alone.
Housing & land patterns
Median home
$2.00M
Median income
$250k
Ownership
94%
Median year built
1970
vs California
+163%
Terrain
San Francisco Bay shoreline · Peninsula valley floors · Santa Cruz Mountains ridges
Hillsborough is an incorporated town in San Francisco Bay Area with a high-value housing market well above the California ACS median, above-average household incomes, a owner-heavy housing mix, and housing stock primarily built during the mid- to late-20th century.
Housing market
Median home value
$2.00M
$2,000,001
Much higher than CA
Median rent
$3,501/mo
Median household income
$250k
$250,001
Much higher than CA
Vacancy rate
5.5%
+163% vs California ACS median
Housing characteristics
Typical home age signal — not a forecast of new construction.
Affordability & housing mix
Home value ÷ income
8×
ACS proxy — median home value divided by median household income
Rent ÷ income
17%
Annual median gross rent as share of median household income
Rent burden 30%+
8%
Share of renter households paying 30% or more of income on gross rent
Derived ACS ratios for market context — not a proprietary cost-of-living index or lender qualification standard.
Units-in-structure mix from ACS — shares of total housing units, not new construction pipeline.
Lifestyle & investment
Families
- Household incomes support a relatively affluent profile
- Neighborhood amenities and lot hazards still decide fit
- Confirm attendance boundaries on the specific APN
Retirees
- Housing stock centered around 1970 — maintenance needs vary
- Walkability and healthcare access differ street to street
- Review HOA rules, insurance, and parcel hazards before buying
Investors
- Owner-heavy markets still need local rental comps
- ACS median gross rent about $3,501/mo
- Zoning, ADU rules, and insurance drive outcomes more than ACS averages
Builders
- Mountain and coastal lots frequently need slide, grade, and WUI diligence
- Verify zoning, setbacks, and utility access early
- Geotechnical and grading reviews are common on hillside lots
Terrain & geography
San Mateo County spans bay flats, Peninsula valleys, and Santa Cruz Mountains. Coastal and mountain parcels are steep; bayshore cities sit on gentler fill and alluvium.
Elevation Sea level to about 2,600+ ft in the Santa Cruz Mountains
Development checklist
- Slope and grading feasibility
- Flood exposure and drainage
- Wildfire / WUI hazard
- Liquefaction and geology where mapped
- Zoning, setbacks, and overlays
- Utility access (water, sewer/septic, power)
- Geotechnical conditions on hillside or fill lots
Screen slope and elevation on the APN in Parcel View, then confirm grading, driveway grades, and pad feasibility with San Mateo County planning and a licensed surveyor/engineer.
Key takeaways
- Housing prices in Hillsborough sit well above the California ACS median.
- Terrain shifts across several landscapes — from san francisco bay shoreline to pacific coastal bluffs.
- Parcel-specific screening for zoning, flood, wildfire, soils, and slope matters more than any countywide average.
What Parcel View checks in Hillsborough
Parcel & APN
Boundary and assessor parcel number context so you can confirm you are looking at the right lot inside or near Hillsborough.
Zoning & land use
Reference zoning and general plan overlays from public GIS—verify final district with Hillsborough or San Mateo County planning.
FEMA flood
National Flood Hazard Layer zones across the parcel, including Special Flood Hazard Areas that affect insurance and building rules around Hillsborough.
Wildfire hazard
CAL FIRE Fire Hazard Severity Zones and WUI context for insurance and defensible-space diligence around Hillsborough.
Soils
USDA SSURGO map units for a first look at septic suitability, drainage, and grading constraints where mapped near Hillsborough.
Geology & slope
Mapped liquefaction, fault, landslide, and terrain screens where the state publishes them for San Mateo County.
Verify locally
Parcel View is a first-pass public GIS screen. City or county planning makes official determinations for Hillsborough.
- Hillsborough / San Mateo planning ↗ — zoning, general plan, and permit rules.
- San Mateo County Assessor ↗ — parcel numbers and lot records.
- San Mateo County Parcel View page — county-wide layers and nearby context.
- San Mateo FEMA flood screen
- San Mateo wildfire hazard screen
- San Mateo zoning screen
- FEMA Map Service Center ↗ — flood zones and base flood elevations.
- CAL FIRE Fire Hazard Severity Zones ↗ — state wildfire hazard mapping.
Living and buying land in Hillsborough
Hillsborough is an incorporated town in San Mateo County, California.
Character: Incorporated town in San Francisco Bay Area.
Population: about 10,883 residents (2023 estimate) across roughly 6.166 square miles.
Climate: Peninsula Mediterranean — cool coast, warmer inland.
Growth outlook: Hillsborough has about 10,883 residents in recent Census estimates; growth and housing capacity still hinge on General Plan / Housing Element updates and infrastructure — confirm with Hillsborough city/town planning (or San Mateo County if the APN is outside city limits).
Jurisdiction check: confirm whether the APN is inside Hillsborough limits or unincorporated San Mateo County before relying on city zoning maps alone.
Wildfire, flood, and insurance diligence in Hillsborough
Hazard diligence is parcel-specific in Hillsborough, but community patterns matter for underwriting and timeline.
Wildfire: community screening level is elevated — Coastal hills and Santa Cruz Mountains edges often need wildfire diligence..
Community wildfire screening note: elevated — Coastal hills and Santa Cruz Mountains edges often need wildfire diligence.
Flood: community screening level is variable — Flood risk varies by floodplain, alluvial fan, and local drainage. Screen FEMA layers on the APN and ask about drainage history..
Community flood screening note: variable — Flood risk varies by floodplain, alluvial fan, and local drainage. Screen FEMA layers on the APN and ask about drainage history.
Seismic: California is seismically active. Review Alquist-Priolo / fault maps and local geologic hazards for the APN..
Coastal influence may add Local Coastal Program, tsunami, or coastal setback questions on some lots.
Insurance diligence often focuses on: wildfire / wui underwriting; brush clearance and defensible space documentation; flood zone determination where fema indicates risk.
FAIR Plan / insurance context: Homeowners insurance can be constrained by wildfire, brush, and sometimes flood. FAIR Plan appears more often in higher wildfire zones — verify early in diligence.
Commute, transit, and utilities in Hillsborough
Commute screen: Commute times from Hillsborough depend on destination, highway access, and time of day. Map drive times for your destinations rather than relying on a single city average..
Walkability: Walkability is usually higher near downtown or village centers and lower on rural/edge lots. Visit the block and check sidewalks, grade, and services..
Bike network: Bike infrastructure varies by corridor. Check local bike plans and ride the actual route you would use.
Downtown / village center: Many incorporated places have a recognizable downtown or commercial corridor — verify whether the subject APN is in that fabric or on a rural/edge lot.
Visit the parcel at the hours you would actually commute — last-mile access varies street-by-street.
Sewer vs septic: Sewer vs septic is parcel-specific in Hillsborough. Confirm connection, capacity, and any septic permits with the local sanitation / environmental health desk..
Wells: Private wells appear more often on rural and edge lots. Confirm well yield, water quality, and any shared-system agreements during diligence.
Natural gas: Natural gas availability varies by street — confirm with the serving utility..
Electric/gas utility context is typically PG&E territory in this part of San Mateo County — confirm the serving utility on the meter.
Hillsborough subareas and lot patterns
Hillsborough is often searched as a single community name on listings and county maps.
Even without a long published neighborhood list, lot-level zoning, hazards, utilities, and school boundaries still vary.
When comparing two lots in Hillsborough, weight WUI/fire, FEMA flood, septic vs sewer, slope/access, and easements carefully.
Lifestyle context for Hillsborough
Hillsborough dining and services cluster near commercial corridors and nearby centers; rural lots may be a drive from groceries and cafes.
Separate lifestyle preferences from lot-level buildability — a great street can still fail on fire insurance, flood zone, slope, or septic capacity.
Pets: Generally pet-friendly at the community level; always confirm HOA, rental, and local animal ordinances for the specific property.
How to screen a parcel in Hillsborough
Enter the address or APN on Screen and confirm jurisdiction (Hillsborough city/town planning vs San Mateo County).
Review zoning, FEMA flood, CAL FIRE / WUI, soils, geology, and slope/elevation overlays.
SB 9 screen: SB 9 may apply to qualifying single-family lots inside city/town limits — confirm lot standards and exclusions with planning..
HOAs: HOAs are common in planned developments and some condo/townhome tracts — request CC&Rs early if the listing mentions an association.
Short-term rentals: Short-term rental rules vary by city and county and often require permits. Verify with code enforcement / planning before assuming Airbnb/VRBO use.
General Plan focus often includes: Confirm land-use designations and Housing Element sites with Hillsborough planning..
- Population
- 10,883 (2023)
- Land area
- 6.166 sq mi
- Character
- Incorporated town in San Francisco Bay Area
- Median home value (ACS)
- $2,000,001 (about 163% above the California statewide ACS median) · ACS 2020-2024
- Median gross rent (ACS)
- $3,501/mo · ACS 2020-2024
- Median household income (ACS)
- $250,001 · ACS 2020-2024
- Homeownership (ACS)
- 94% owner-occupied
- Housing stock age
- About 1970
- Market context
- Median home $2,000,001 (about 163% above the California statewide ACS median); vacancy about 5.5% · ACS 2020-2024 context
- County elevation range
- Sea level to about 2,600+ ft in the Santa Cruz Mountains
- Fire risk (community)
- elevated — Coastal hills and Santa Cruz Mountains edges often need wildfire diligence.
- Flood risk (community)
- variable — Flood risk varies by floodplain, alluvial fan, and local drainage. Screen FEMA layers on the APN and ask about drainage history.
- Sewer / septic
- Public sewer vs septic varies by neighborhood and edge lots — confirm with local sanitation / environmental health.
- ADU screening
- California statewide ADU law is strong; confirm local ordinance standards, setbacks, and parcel hazards with planning before design.
- Downtown
- Often higher near downtown / main-street corridors; lower on rural or hillside lots.
Common Hillsborough buyer questions
Short screening answers for searches buyers actually type. These are community-level notes — confirm on the parcel and with local city planning.
Is this area expensive?
Median owner-occupied home value is about $2,000,001 (about 163% above the California statewide ACS median); median gross rent about $3,501/mo. Neighborhoods vary — confirm current listings with a local agent.
Is it a buyer's market?
Median home $2,000,001 (about 163% above the California statewide ACS median); vacancy about 5.5% · ACS 2020-2024 context
Is it growing?
Hillsborough has about 10,883 residents in recent Census estimates; growth and housing capacity still hinge on General Plan / Housing Element updates and infrastructure — confirm with Hillsborough city/town planning (or San Mateo County if the APN is outside city limits).
Is it family friendly?
High household incomes (about $250,001) suggest a relatively affluent community, but school quality, commute, parks, and parcel hazards still decide family fit. Confirm attendance boundaries and screen fire/flood on the APN.
Is it good for retirees?
Housing built around 1970 means maintenance needs vary. Walkability, healthcare access, HOA rules, and insurance costs should be reviewed before purchasing.
Is it good for investors?
Tenure mix is about 94% owner-occupied. Median gross rent about $3,501/mo. Rental demand may help, but zoning, ADU rules, STR ordinances, and insurance ultimately determine investment potential.
Are rentals in demand?
Median gross rent is about $3,501/mo. Confirm vacancy, comps, and any rent-stabilization or STR rules before underwriting.
Is there new construction?
Typical stock ages to around 1970; newer tracts and Housing Element sites still need local planning maps. Check current applications with Hillsborough city/town planning (or San Mateo County if the APN is outside city limits).
Can I build an ADU?
California statewide ADU law is strong; confirm local ordinance standards, setbacks, and parcel hazards with planning before design.
Is it wildfire prone?
Community wildfire screening note: elevated — Coastal hills and Santa Cruz Mountains edges often need wildfire diligence.
Is flooding common?
Community flood screening note: variable — Flood risk varies by floodplain, alluvial fan, and local drainage. Screen FEMA layers on the APN and ask about drainage history.
Is there public sewer?
Sewer vs septic is parcel-specific in Hillsborough. Confirm connection, capacity, and any septic permits with the local sanitation / environmental health desk.
Are wells common?
Private wells appear more often on rural and edge lots. Confirm well yield, water quality, and any shared-system agreements during diligence.
Are HOAs common?
HOAs are common in planned developments and some condo/townhome tracts — request CC&Rs early if the listing mentions an association.
Are short-term rentals allowed?
Short-term rental rules vary by city and county and often require permits. Verify with code enforcement / planning before assuming Airbnb/VRBO use.
What is the average commute?
Commute times from Hillsborough depend on destination, highway access, and time of day. Map drive times for your destinations rather than relying on a single city average.
Is it walkable?
Walkability is usually higher near downtown or village centers and lower on rural/edge lots. Visit the block and check sidewalks, grade, and services.
Is it bike friendly?
Bike infrastructure varies by corridor. Check local bike plans and ride the actual route you would use.
Does it have a downtown?
Many incorporated places have a recognizable downtown or commercial corridor — verify whether the subject APN is in that fabric or on a rural/edge lot.
Is it pet friendly?
Generally pet-friendly at the community level; always confirm HOA, rental, and local animal ordinances for the specific property.
Screen a parcel in Hillsborough San Mateo County guide
Profile confidence: medium · Updated 2026-08-05. Informational screening only.
Frequently asked questions about Hillsborough parcels
Is land in Hillsborough buildable?
Buildability is not a single map label. Screen zoning, flood, wildfire hazard, access, and soils for the specific APN near Hillsborough, then ask Hillsborough planning whether your proposed use can be entitled and permitted.
How do I check zoning in Hillsborough?
Run a Parcel View screen for a first-pass zoning/general-plan reference, then confirm the controlling district with Hillsborough or San Mateo County planning. Overlays and specific plans can change what is allowed.
Does Hillsborough have FEMA flood risk?
Flood risk is parcel-specific. Parcel View intersects the FEMA National Flood Hazard Layer with the lot polygon. Always verify Special Flood Hazard Areas and base flood elevations on the FEMA Map Service Center before financing or building.
How do I screen a parcel in Hillsborough?
Enter the address or APN in Parcel View. Confirm whether the lot is inside Hillsborough limits or unincorporated San Mateo County, then verify zoning on the official planning site.
Is Parcel View a substitute for Hillsborough planning?
No. It is a first-pass public GIS screen with source links. City or county planning makes official determinations.