491 Old Colony Rd is a 4,097 square foot house on a 1.68 acre lot with 4 bedrooms and 2 bathrooms. - it last sold on July 23, 2007 for $275,900. Based on Redfin's Defiance data, we estimate the home's value is $485,370.
Single-familyProperty Type
1820Year Built
1.68 acresLot Size
$118Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$485,370
$209K since sold in July 2007$13K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 22% lower than the average sale price ($622K) of 5 comparable homes.
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning
A
Agricultural District
The intent of this district is to provide for agricultural, recreational, wildlife, open space, farming, river oriented uses and related uses and to discourage premature and disassociated urban development. The minimum lot size of 5 acres is designed to support agricultural uses and home sites which require proper siting in a rural area.
Permitted uses
Include but are not limited to:
Agriculture
Dairy
Livestock production
Religious facility
Housing-Single unit
Public service
Educational/school
Golf related
Cemetery
Park & open space
Property details
Interior
Basement Information
Basement Sq. Ft: 592
Bathroom Information
# of Full Baths: 2
Heating & Cooling
Heating Type: Forced Air
Fireplace Information
# of Fireplaces: 1
Fireplace Type: 1 Story 1 Opening
Has Fireplace
Room Information
# of Rooms: 6
Exterior
Exterior Information
Physical Condition: Average
Floor Construction Type: Plywood
Foundation Type: Continuous Wall
Building Construction Quality: Average
Pool Information
Has Pool
Property Information
Living Sq. Ft: 4,097
Building Sq. Ft: 4,689
# of Stories: 2
Stories Type: 1
Legal Description: PT FRL W 1/2 AKA LOT C
Lot Information
# of Buildings: 1
Land Sq. Ft: 73,181
Legal Lot Number: C
School Tax District: FRANCIS HOWELL
Municipality Name: UNINCORPORATED
Acres: 1.68
Zoning Code: AA1
County Use Description: SINGLE FAMILY RESID
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 4
Baths: 2.0
Sq. Ft.: 4,097
Stories: 2.0
Lot Size: 1.68 acres
Style: Single Family Residential
Year Built: 1820
Year Renovated: —
County: St. Charles County
APN: 3-0086-S015-00-0001.2000000
Home facts updated by county records on Aug 7, 2026
Around this home
Schools
Daniel Boone Elementary School
Public K-5 • Assigned • 6.1mi
9/10
Francis Howell Middle School
Public 6-8 • Assigned • 7.6mi
8/10
Francis Howell High School
Public 9-12 • Assigned • 5.1mi
10/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
1/10 Fire Factor
Unlikely to be in a wildfire in next 30 years
4/10 Heat Factor
7 days above 107° expected this year, 20 days in 30 years
2/10 Wind Factor
1% chance of strong winds in next 30 years
2/10 Air Factor
0 unhealthy days expected this year, 2 days in 30 years
Provided by First Street
Historical weather
Defiance, MO • 63341
Average low and high temperatures (°F)
39
21
48
29
67
42
72
51
75
56
85
67
90
72
87
65
83
60
74
49
58
40
47
30
Jan
Feb
Mar
Apr
May
Jun
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Aug
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Dec
Sun exposure
In this area, properties receive around 9.7 hours in
June and 4.2 hours in December, which is comparable to the
U.S. average for solar exposure.
9.7 hrs
4.2 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$462,000 – $559,000
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