San Mateo County · city

San Mateo

San Mateo is an incorporated city in San Mateo County, in the San Francisco Bay Area. About 101,327 residents (2023 Census estimate). 12.1 sq mi of land. Includes substantial mapped water area. Verify city vs county jurisdiction on the APN. Screen any APN in or near San Mateo for zoning, FEMA flood, CAL FIRE / WUI wildfire hazard, soils, geology, and planning — every finding linked to the official source — then verify with San Mateo or San Mateo County planning before you…

Updated 2026-08-29

Useful sources for searching San Mateo: Official sources to verify buildability in San Mateo ↓

About San Mateo land diligence

San Mateo is an incorporated city in San Mateo County, in the San Francisco Bay Area. About 101,327 residents (2023 Census estimate). 12.1 sq mi of land. Includes substantial mapped water area. Verify city vs county jurisdiction on the APN.

Confirm whether the lot is inside San Mateo 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 San Mateo, FEMA flood near San Mateo, CAL FIRE hazard severity, APN lookup, and whether a vacant lot is buildable before you spend on surveys or design.

Community snapshot

San Mateo is an incorporated city in San Mateo County, California.

Character: Incorporated city in San Francisco Bay Area.

Population: about 101,327 residents (2023 estimate) across roughly 12.117 square miles.

Climate: Peninsula Mediterranean — cool coast, warmer inland.

Growth outlook: San Mateo has about 101,327 residents in recent Census estimates; growth and housing capacity still hinge on General Plan / Housing Element updates and infrastructure — confirm with San Mateo city/town planning (or San Mateo County if the APN is outside city limits).

Jurisdiction check: confirm whether the APN is inside San Mateo limits or unincorporated San Mateo County before relying on city zoning maps alone.

Housing & land patterns

Median home

$1.62M

Median income

$154k

Ownership

50%

Median year built

1965

vs California

+113%

Terrain

San Francisco Bay shoreline · Peninsula valley floors · Santa Cruz Mountains ridges

San Mateo is an incorporated city in San Francisco Bay Area with a high-value housing market well above the California ACS median, above-average household incomes, a nearly even owner/renter split, and housing stock primarily built during the mid- to late-20th century.

Housing market

Median home value

$1.62M

$1,618,700

Much higher than CA

Median rent

$3,077/mo

Median household income

$154k

$153,504

Much higher than CA

Vacancy rate

6.4%

California$760k
San Mateo$1.62M

+113% vs California ACS median

Housing characteristics
Owner-occupied50%
Renter-occupied50%
1965
19202025

Typical home age signal — not a forecast of new construction.

Affordability & housing mix

Home value ÷ income

10.5×

ACS proxy — median home value divided by median household income

Rent ÷ income

24%

Annual median gross rent as share of median household income

Rent burden 30%+

37%

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.

Single-family units51%
Multifamily units44%

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 1965 — maintenance needs vary
  • Walkability and healthcare access differ street to street
  • Review HOA rules, insurance, and parcel hazards before buying

Investors

  • Balanced tenure mix can support rental demand
  • ACS median gross rent about $3,077/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

01San Francisco Bay shorelineSan Francisco Bay shoreline flats and fill
02Peninsula valley floorsPeninsula valley floors
03Santa Cruz Mountains ridgesSanta Cruz Mountains ridges and redwood canyons
04Pacific coastal bluffsPacific coastal bluffs and terraces
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 San Mateo 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 San Mateo

Parcel & APN

Boundary and assessor parcel number context so you can confirm you are looking at the right lot inside or near San Mateo.

Zoning & land use

Reference zoning and general plan overlays from public GIS—verify final district with San Mateo 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 San Mateo.

Wildfire hazard

CAL FIRE Fire Hazard Severity Zones and WUI context for insurance and defensible-space diligence around San Mateo.

Soils

USDA SSURGO map units for a first look at septic suitability, drainage, and grading constraints where mapped near San Mateo.

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 San Mateo.

Living and buying land in San Mateo

San Mateo is an incorporated city in San Mateo County, California.

Character: Incorporated city in San Francisco Bay Area.

Population: about 101,327 residents (2023 estimate) across roughly 12.117 square miles.

Climate: Peninsula Mediterranean — cool coast, warmer inland.

Growth outlook: San Mateo has about 101,327 residents in recent Census estimates; growth and housing capacity still hinge on General Plan / Housing Element updates and infrastructure — confirm with San Mateo city/town planning (or San Mateo County if the APN is outside city limits).

Jurisdiction check: confirm whether the APN is inside San Mateo limits or unincorporated San Mateo County before relying on city zoning maps alone.

Wildfire, flood, and insurance diligence in San Mateo

Hazard diligence is parcel-specific in San Mateo, 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 San Mateo

Commute screen: Commute times from San Mateo 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 San Mateo. 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.

San Mateo subareas and lot patterns

San Mateo 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 San Mateo, weight WUI/fire, FEMA flood, septic vs sewer, slope/access, and easements carefully.

Lifestyle context for San Mateo

San Mateo 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 San Mateo

Enter the address or APN on Screen and confirm jurisdiction (San Mateo 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 San Mateo planning..

Population
101,327 (2023)
Land area
12.117 sq mi
Character
Incorporated city in San Francisco Bay Area
Median home value (ACS)
$1,618,700 (about 113% above the California statewide ACS median) · ACS 2020-2024
Median gross rent (ACS)
$3,077/mo · ACS 2020-2024
Median household income (ACS)
$153,504 · ACS 2020-2024
Homeownership (ACS)
50% owner-occupied
Housing stock age
About 1965
Market context
Median home $1,618,700 (about 113% above the California statewide ACS median); vacancy about 6.4% · 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 San Mateo 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 $1,618,700 (about 113% above the California statewide ACS median); median gross rent about $3,077/mo. Neighborhoods vary — confirm current listings with a local agent.

Is it a buyer's market?

Median home $1,618,700 (about 113% above the California statewide ACS median); vacancy about 6.4% · ACS 2020-2024 context

Is it growing?

San Mateo has about 101,327 residents in recent Census estimates; growth and housing capacity still hinge on General Plan / Housing Element updates and infrastructure — confirm with San Mateo city/town planning (or San Mateo County if the APN is outside city limits).

Is it family friendly?

High household incomes (about $153,504) 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 1965 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 50% owner-occupied. Median gross rent about $3,077/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 $3,077/mo. Confirm vacancy, comps, and any rent-stabilization or STR rules before underwriting.

Is there new construction?

Typical stock ages to around 1965; newer tracts and Housing Element sites still need local planning maps. Check current applications with San Mateo 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 San Mateo. 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 San Mateo 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 San Mateo San Mateo County guide

Profile confidence: medium · Updated 2026-08-05. Informational screening only.

Frequently asked questions about San Mateo parcels

Is land in San Mateo buildable?

Buildability is not a single map label. Screen zoning, flood, wildfire hazard, access, and soils for the specific APN near San Mateo, then ask San Mateo planning whether your proposed use can be entitled and permitted.

How do I check zoning in San Mateo?

Run a Parcel View screen for a first-pass zoning/general-plan reference, then confirm the controlling district with San Mateo or San Mateo County planning. Overlays and specific plans can change what is allowed.

Does San Mateo 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 San Mateo?

Enter the address or APN in Parcel View. Confirm whether the lot is inside San Mateo limits or unincorporated San Mateo County, then verify zoning on the official planning site.

Is Parcel View a substitute for San Mateo planning?

No. It is a first-pass public GIS screen with source links. City or county planning makes official determinations.

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