13640 Highway 40 is a 1,344 square foot house on a 5.75 acre lot with 2 bedrooms and 2 bathrooms. Based on Redfin's Keystone data, we estimate the home's value is $525,137.
Single-familyProperty Type
1987Year Built
5.75 acresLot Size
$391Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$525,137
$17K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 6.2% lower than the average sale price ($560K) of 6 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
$4,622 (+21.9%)
$181,800 + $275,900
$457,700
2024
$3,792 (−1.0%)
$181,800 + $275,900
$457,700
2023
$3,829 (+7.1%)
$141,700 + $224,900
$366,600
2022
$3,575 (+5.3%)
$70,900 + $207,600
$278,500
2021
$3,394 (+25.8%)
$70,900 + $207,600
$278,500
2020
$2,699 (+1.3%)
$53,200 + $147,300
$200,500
2019
$2,664 (+13.3%)
$53,200 + $154,800
$208,000
2018
$2,351 (+1.6%)
$53,200 + $135,400
$188,600
2017
$2,314 (−8.1%)
$53,100 + $118,000
$171,100
2016
$2,518 (+3.5%)
$53,100 + $104,800
$157,900
2013
$2,433
$53,100 + $112,200
$165,300
Tax history for 13640 Highway 40
Year
Property tax
Land + Additions
Assessment*
2025
$4,622 (+21.9%)
$181,800 + $275,900
$457,700
2024
$3,792 (−1.0%)
$181,800 + $275,900
$457,700
2023
$3,829 (+7.1%)
$141,700 + $224,900
$366,600
2022
$3,575 (+5.3%)
$70,900 + $207,600
$278,500
2021
$3,394 (+25.8%)
$70,900 + $207,600
$278,500
2020
$2,699 (+1.3%)
$53,200 + $147,300
$200,500
2019
$2,664 (+13.3%)
$53,200 + $154,800
$208,000
2018
$2,351 (+1.6%)
$53,200 + $135,400
$188,600
2017
$2,314 (−8.1%)
$53,100 + $118,000
$171,100
2016
$2,518 (+3.5%)
$53,100 + $104,800
$157,900
2013
$2,433
$53,100 + $112,200
$165,300
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning and permits
Zoning
Permits
RR
Rural Residential District
Rural Residential establishes large-lot residential development in three areas: natural, agricultural, or surrounding open space.
Permitted uses
Include but are not limited to:
Housing-Single unit
Communications tower
Transportation
Jan 23, 2019 • Final
Co operating
Install a conventional heating and air conditioning system.
HVAC
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: 2
Exterior
Exterior Information
Building Style Type: Ranch
Building Construction Quality: Average
Building Type: Single Family
Property Information
Living Sq. Ft: 1,344
Building Sq. Ft: 1,344
Legal Description: S19, T2S, R07E, BLACK HILLS MERIDIAN, S440' EXCLUDING THE E450' OF THAT PORTION OF LOT 5 LYING EAST OF HWY LESS HWY RTY
Lot Information
# of Buildings: 1
Land Sq. Ft: 250,492
Legal Lot Number: 5
Acres: 5.7505
County Use Description: DWLNGS & AUTO GAR ON AG LAND
Financial
Assessor Information
Assessment Year: 2025
Public facts
Beds: 2
Baths: 2.0
Sq. Ft.: 1,344
Stories: —
Lot Size: 5.75 acres
Style: Single Family Residential
Year Built: 1987
Year Renovated: —
County: Pennington County
APN: 19660
Home facts updated by county records on Jul 20, 2026
Around this home
Schools
Hermosa Elementary - 04
Public PreK-6 • Assigned • 7.1mi
5/10
Custer Middle School - 05
Public 7-8 • Assigned • 14.2mi
8/10
Custer High School - 01
Public 9-12 • Assigned • 14.2mi
5/10
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
6/10 Fire Factor
10% chance of being in a wildfire in next 30 years
2/10 Heat Factor
7 days above 92° expected this year, 16 days in 30 years
2/10 Wind Factor
Minor risk of severe winds over next 30 years
3/10 Air Factor
2 unhealthy days expected this year, 4 days in 30 years
Provided by First Street
Historical weather
Keystone, SD • 57751
Average low and high temperatures (°F)
35
16
39
16
53
30
54
32
64
43
74
51
79
59
79
57
78
52
64
39
49
28
45
24
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 10.3 hours in
June and 4.8 hours in December, placing it above the
U.S. average for solar exposure.
10.3 hrs
4.8 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$499,000 – $604,000
Sell confidently with a local market expert in Keystone. 3 minutes to get started.