1st Ave, Sonoma, CA Property Records

Sonoma County property records for 18 addresses on 1st Ave, Sonoma, CA · Last verified August 2026

1st Ave Highlights

Properties 18
Median Sale Price $875,000
Deeds and Mortgages on File 29
Median Price per Sqft $522
Owner Occupied 67%
Median Annual Tax Bill $6,203
Median Year Built 1950
Median Ownership Tenure 8 years

Properties on 1st Ave

Owner names and prior sale amounts shown locked below are available instantly with a free trial.

18311 1st Ave

1 bd · 1 ba · 713 sqft · 0.075 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$250,000Jul 2019 $6,2032025 1 Name on Record Assessor + 1 DocumentUpdated May 2026

18317 1st Ave

3 bd · 1 ba · 1,162 sqft · 0.126 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$150,000Sep 1994 $5,2572025 2 Names on Record Owner Occupied AssessorUpdated May 2026

18321 1st Ave

2 bd · 2 ba · 1,066 sqft · 0.126 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$585,000Jul 2020 $9,6842025 Amount on Record Jun 2013 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated May 2026

18337 1st Ave

1 bd · 1 ba · 725 sqft · 0.126 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$160,000Sep 2002 $5,5572025 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated May 2026

18350 1st Ave

3 bd · 2.5 ba · 1,724 sqft · 0.16 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$900,000Mar 2021 $12,5702025 Amount on Record Jun 2017 1 Name on Record Assessor + 5 DocumentsUpdated Aug 2026

18414 1st Ave

3 bd · 2 ba · 1,200 sqft · 0.17 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$270,500Nov 2009 $5,0572025 Amount on Record Oct 2009 1 Name on Record Owner Occupied AssessorUpdated Apr 2026

18417 1st Ave

3 bd · 1 ba · 1,288 sqft · 0.137 acres

Last Sale Tax Bill Prior Sale Owner Records
$200,000Oct 2003 $5,6592025 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Apr 2026

18418 1st Ave

1 bd · 1 ba · 1,032 sqft · 0.126 acres

Last Sale Tax Bill Prior Sale Owner Records
$875,000Mar 2026 $8,5102025 1 Name on Record Assessor + 4 DocumentsUpdated Aug 2026

18432 1st Ave

2 bd · 1 ba · 792 sqft · 0.176 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$180,000Mar 2011 $4,8912025 Amount on Record Jan 2011 1 Name on Record Owner Occupied AssessorUpdated May 2026

18441 1st Ave

2 bd · 1 ba · 886 sqft · 0.137 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$250,000Aug 2001 $5,8742025 1 Name on Record Owner Occupied AssessorUpdated May 2026

18443 1st Ave

2 bd · 1 ba · 712 sqft · 0.137 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$365,000Oct 2018 $6,6172025 2 Names on Record Assessor + 4 DocumentsUpdated Apr 2026

18445 1st Ave

2 bd · 2.5 ba · 1,104 sqft · 0.137 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$1,050,000Dec 2025 $10,4082025 Amount on Record Apr 2021 2 Names on Record Assessor + 4 DocumentsUpdated Apr 2026

18449 1st Ave

3 bd · 2 ba · 1,482 sqft · 0.137 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$650,000Sep 2019 $10,6272025 Amount on Record Aug 1993 1 Name on Record Owner Occupied Assessor + 2 DocumentsUpdated May 2026

18450 1st Ave

0.202 acres

Last Sale Tax Bill Prior Sale Owner Records
$76,672Dec 1995 $1,8512025 Amount on Record Aug 1989 2 Names on Record Assessor + 2 DocumentsUpdated Apr 2026

18451 1st Ave

2 bd · 1 ba · 836 sqft · 0.137 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$480,000Jun 2017 $8,0802025 Amount on Record Dec 1993 1 Name on Record Owner Occupied Assessor + 2 DocumentsUpdated May 2026

18454 1st Ave

4 bd · 3 ba · 2,100 sqft · 0.132 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,000,000Jun 2022 1 Name on Record Owner Occupied AssessorUpdated May 2026

18480 1st Ave

2 bd · 2 ba · 1,064 sqft · 0.126 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$520,000May 2021 $8,2422025 Amount on Record Nov 2011 1 Name on Record Owner Occupied Assessor + 2 DocumentsUpdated May 2026

18491 1st Ave

2 bd · 1 ba · 1,091 sqft · 0.261 acres

Last Sale Tax Bill Prior Sale Owner Records
$4,2092025 1 Name on Record Owner Occupied AssessorUpdated May 2026

Wildfire Risk on 1st Ave

Source: USDA Forest Service Wildfire Risk to Communities · 2nd edition (2024), fuels as of 2020

Wildfire Risk to HomesLow
this street's cells rank at the 20th percentile of exposed land nationally · 11th in California
Wildfire LikelihoodLow — about 1 in 4,348 per year
ExposureIndirect
0 of 1 cells directly exposed

Property Records in Nearby Streets