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641 Mount Duncan Dr, Clayton, CA 94517 Property Records

Contra Costa County property record for 641 Mount Duncan Dr, Clayton, CA 94517

Property Summary

Property TypeSingle Family Home
Details4 bd · 3 ba · 2,481 sqft · built 1978
Lot Size0.265 acres (11,543 sqft)
OwnerIndividual Name on File
Last Sale$605,000 (Oct 2011)
Tax Bill$9,738 (2025)
Deeds & MortgagesAug 2026 Sale
Jun 2018 Transfer
Flood ZoneZone X (minimal risk)
APN119-490-002-1

Property Details

APN / Parcel Number

Primary APN119-490-002-1
Alternative APN
  • 119-490-002

Interior

Bedrooms4 Beds
Full Baths3 Baths
Total Rooms11 Rooms
Stories2 Stories
Building Area2,481 sqft Living Area
1st Floor Area1,360 sqft
2nd Floor Area1,121 sqft

Exterior

Year BuiltBuilt 1978
Effective Year BuiltEffective 1979
Architectural StyleCluster
Lot Area11,543 sqft (0.265 acres)
Garage TypeAttached
Garage Area663 sqft
Parking Spaces2 Parking Spaces

Utilities, Heating & Cooling

Cooling SystemCentral

Location & Zoning

Street Address641 MT DUNCAN DR
CityCLAYTON
StateCA
Zip94517-1603
Property CategoryResidential
Property TypeResidential > Single Family > Home
Legal DescriptionT04019 L0002 B EX MR
Legal SubdivisionMAP/SUB 3740
Legal Tract04019
Legal Lot Number2
JurisdictionCONTRA COSTA CA
Township / Civil DivisionCENTRAL CONTRA COSTA
Census Block Group3
Census Block3011
Census Tract355306

Owner

641 Mount Duncan Dr is owned and occupied by an individual who bought it in October 2011.

Source: Contra Costa County records, as of September 1, 2026

Owner of RecordIndividual Name on File
Mailing Address641 MT DUNCAN DR, CLAYTON, CA 94517-1603
OccupancyOwner Occupied
Owner TypeIndividual
VestingSole Owner

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Deeds, Mortgages & Sale History

DateDocument
Aug 24, 2026Grant Deed, Transfer
NONE LISTED ON DOCUMENT
Jun 8, 2018Affidavit of Death, Transfer

Assessor's Deed Record

Deed NamesName on Deed
Last SaleOct 7, 2011 · Amount on File
Deed SaleOct 7, 2011 · Amount on File
Prior SaleSep 8, 2004 · Amount on File
Deed Document Number2011208736
Prior Transfer DateJul 14, 2006
Prior Transfer Doc0000230851
Record UpdatedOct 29, 2026

August 2026: Grant Deed, Transfer

Document TypeGrant Deed
JurisdictionCONTRA COSTA CA
Recording DateAug 24, 2026
Property Address641 MT DUNCAN DR, CLAYTON, CA 94517-1603
Document Number0000089193
Instrument DateAug 21, 2026
Instrument202689193
Transaction TypeTransfer
Record UpdatedSep 9, 2026
Title CompanyNONE LISTED ON DOCUMENT

Transaction

Tax$0.00
Amount AccuracyFull Amount Stated

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipSole Owner
Address641 MT DUNCAN DR, CLAYTON, CA 94517-1603

June 2018: Affidavit of Death, Transfer

Document TypeAffidavit of Death
JurisdictionCONTRA COSTA CA
Recording DateJun 8, 2018
Property Address641 MT DUNCAN DR, CLAYTON, CA 94517-1603
Document Number0000091305
Instrument DateMay 3, 2018
Instrument91305
Transaction TypeTransfer
Record UpdatedJun 20, 2018

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipLiving Trust
Address478 NEW WELL AVE LATHROP CA 953308971, LATHROP, CA 95330-8971

Tax Assessment & Valuation

The 2025 property tax bill for 641 Mount Duncan Dr was $9,738.

Source: Contra Costa County assessment roll, as of July 14, 2026

Property Jurisdictions

TypeName
StateCalifornia
CountyContra Costa County
MunicipalityClayton City
Unified School DistrictMount Diablo Unified School District (KG - 12)

Tax Bill & Assessment History

YearTax BillAssessed Value
2026$775,102 (+2%) Land $397,159 Building $377,943
2025$9,738.00$759,905 Land $389,372 Building $370,533
2023$9,323.00 (+1.33%)$730,399 Land $374,253 Building $356,146
2022$9,201.00

Assessed value is set for property tax purposes and is not a market price estimate.

Flood

FEMA maps place 641 Mount Duncan Dr in Zone X, an area of minimal flood risk.

Source: FEMA National Flood Hazard Layer, effective October 12, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood ZoneZone X
minimal risk
Flood Insurance RequirementNot required
lenders may require it
Nearby Flood Policies4 in force

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.

Wildfire

Wildfire risk around 641 Mount Duncan Dr is high, ranking above 79% of the US, with a 0.5% annual chance of wildfire.

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire RiskHigh
above 79% of the US · above 56% of California
Wildfire Likelihood0.5% annual chance
ExposureDirect
burnable vegetation

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water SystemCONTRA COSTA WATER DISTRICT
serves 210,500 people · EPA ID CA0710003
Water SourceSurface water
Last State InspectionJan 2022
LeadUnder 1 ppb (2026–2028)
action level 15 ppb

Violations Reported to EPA

Water QualityNone
last 10 years
Treatment and ProcedureNone
last 10 years
Monitoring and ReportingNone
last 3 years

Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.

Internet Providers

Source: FCC Broadband Data Collection, based on 420 locations within half a mile, as of December 31, 2025

ProviderMax Down / Up (Mbps)
Xfinity
Cable		2,000 / 250
Unwired
Fixed Wireless		300 / 25
Verizon
Fixed Wireless		300 / 20
T-Mobile
Fixed Wireless		100 / 20

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