640 Mill St is a 950 square foot house on a 5,124 square foot lot with 2 bedrooms and 1 bathroom. Based on Redfin's Santa Rosa data, we estimate the home's value is $492,867.
Single-familyProperty Type
1922Year Built
5,124 sq ftLot Size
$519Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$492,867
$0 since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 15.5% lower than the average sale price ($583K) of 5 comparable homes.
As the MLS and public records start to fill up, we'll list the details here.
Year
Property tax
Land + Additions
Assessment*
2025
$5,825 (+1.6%)
$220,271 + $305,159
$525,430
2024
$5,735 (+85.6%)
$215,952 + $299,176
$515,128
2023
$3,090 (+4.0%)
$211,718 + $293,310
$505,028
2022
$2,972 (+1.2%)
$147,724 + $124,517
$272,241
2021
$2,936 (+0.2%)
$144,828 + $122,076
$266,904
2020
$2,930 (+0.5%)
$141,989 + $119,683
$261,672
2019
$2,915 (+0.6%)
$140,534 + $118,456
$258,990
2018
$2,899 (+1.8%)
$137,779 + $116,134
$253,913
2017
$2,847 (+4.0%)
$132,430 + $111,625
$244,055
2015
$2,738 (+6.5%)
$129,834 + $109,437
$239,271
2014
$2,571 (+14.8%)
$125,379 + $105,683
$231,062
2013
$2,240 (+22.6%)
$125,379 + $105,683
$231,062
2012
$1,827 (−17.9%)
$108,500 + $91,500
$200,000
2011
$2,227 (−8.9%)
$88,000 + $74,000
$162,000
2010
$2,445 (−0.6%)
$107,000 + $91,000
$198,000
2009
$2,460 (+2.0%)
$119,071 + $100,367
$219,438
2007
$2,411
$117,014 + $98,634
$215,648
Tax history for 640 Mill St
Year
Property tax
Land + Additions
Assessment*
2025
$5,825 (+1.6%)
$220,271 + $305,159
$525,430
2024
$5,735 (+85.6%)
$215,952 + $299,176
$515,128
2023
$3,090 (+4.0%)
$211,718 + $293,310
$505,028
2022
$2,972 (+1.2%)
$147,724 + $124,517
$272,241
2021
$2,936 (+0.2%)
$144,828 + $122,076
$266,904
2020
$2,930 (+0.5%)
$141,989 + $119,683
$261,672
2019
$2,915 (+0.6%)
$140,534 + $118,456
$258,990
2018
$2,899 (+1.8%)
$137,779 + $116,134
$253,913
2017
$2,847 (+4.0%)
$132,430 + $111,625
$244,055
2015
$2,738 (+6.5%)
$129,834 + $109,437
$239,271
2014
$2,571 (+14.8%)
$125,379 + $105,683
$231,062
2013
$2,240 (+22.6%)
$125,379 + $105,683
$231,062
2012
$1,827 (−17.9%)
$108,500 + $91,500
$200,000
2011
$2,227 (−8.9%)
$88,000 + $74,000
$162,000
2010
$2,445 (−0.6%)
$107,000 + $91,000
$198,000
2009
$2,460 (+2.0%)
$119,071 + $100,367
$219,438
2007
$2,411
$117,014 + $98,634
$215,648
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Permits
Aug 16, 2018 • Final
Non-residential electrical
Install an electrical meter in the public right of way as part of a wireless small cell installation. The equipment will be attached to an existing utility pole.
Electrical
Electric meter
Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.
Property details
Interior
Bathroom Information
# of Full Baths: 1
Fireplace Information
# of Fireplaces: 1
Has Fireplace
Room Information
# of Rooms: 4
Exterior
Exterior Information
Building Style Type: L-Shape
Construction Type: Wood/Steel
Building Construction Quality: Average
Property Information
Subdivision Name: WHEELERS ADD 02
Living Sq. Ft: 950
Ground Floor Sq. Ft: 950
Building Sq. Ft: 950
# of Stories: 1
Legal Description: OFFICIAL RECS 20 PG 25 BLK 5 LOT 139
Parking & Garage Information
Parking Type: Detached Garage
Garage/Parking Sq. Ft: 720
Garage / Carport Type: Detached
Lot Information
# of Buildings: 1
Land Sq. Ft: 5,124
Legal Lot Number: 139
Legal Block Number: 5
Acres: 0.1176
Zoning Code: CITYSR
County Use Description: SINGLE FAM DWELLING
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 2
Baths: 1.0
Sq. Ft.: 950
Stories: 1.0
Lot Size: 5,124 square feet
Style: Single Family Residential
Year Built: 1922
Year Renovated: 1922
County: Sonoma County
APN: 009263004000
Home facts updated by county records on Aug 13, 2026
Around this home
Schools
Luther Burbank Elementary School
Public K-6 • Assigned • 0.3mi
5/10
Montgomery High School
Public 9-12 • Assigned • 1.5mi
7/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
3/10 Flood Factor
Estimated 10-14% chance of a flood reaching the building in the next 30 years
3/10 Fire Factor
0.15% chance of being in a wildfire in next 30 years
4/10 Heat Factor
7 days above 92° expected this year, 15 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
8/10 Air Factor
15 unhealthy days expected this year, 17 days in 30 years
Provided by First Street
Historical weather
Santa Rosa, CA • 95404
Average low and high temperatures (°F)
63
41
64
44
72
47
70
47
77
51
80
54
79
54
86
55
83
55
79
51
65
46
60
44
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 11.1 hours in
June and 4.9 hours in December, placing it above the
U.S. average for solar exposure.
11.1 hrs
4.9 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$469,000 – $567,000
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