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Single Family ResidenceResidential
$1,950,000$1,282 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 59How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026

13639 HIGHWAY 40

KEYSTONE, SD 57751
3
Beds
3
Baths
1,521 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
11.42 ac
Lot SizeThe size of the land the home sits on, from county records.
2002
Year BuiltThe year the home was originally built, according to county records.

Valuation

$2M
$1.2M low$2.7M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$13,820 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$1,105,500 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$265,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$839,600
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,105,500

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.197 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.1 percent flood zone

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Ranch
CountyPENNINGTON
Lot (acres)The size of the land the home sits on, from county records.11.42
ConstructionThe main material the home's frame and walls are built from.Log
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 360 ft²Patio · 1,248 ft²Porch · 1,248 ft²

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Hermosa Elementary - 04B-
Elementary · Grades PK–6 · 7.2 mi
H
Custer High School - 01C+
High · Grades 9–12 · 14.2 mi

District: Custer School District 16-1

Neighborhood · ZIP 57751These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.109
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.104
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.39

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.78%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.25%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.6%
PopulationHow many people live in this area.794
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.12 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$111,312
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$130,793
Average tempThe average temperature here across a full year.46°F
Annual precipHow much rain and melted snow falls here in a typical year.20 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.63%

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Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

13639 Highway 40 measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Among the most valuable homes in Pennington County
  • Among the highest price per square foot in Pennington County
  • Has a bigger lot than 96% of homes in Pennington County
  • Newer than 74% of homes in Pennington County

What homes are worth in Keystone 57751

Each bar is how many homes fall in that price range. The marker is this home.

This home
$252K$1.9M

This home is worth more than almost all homes in Keystone 57751.

How it measures up in Keystone 57751

The dot is this home. The mark in the middle is the typical home in Keystone 57751.

Estimated value$1,950,000
CheaperTypical $642,512Pricier

Pricier than almost all homes nearby

Price per ft²$1282
CheaperTypical $443Pricier

Pricier than almost all homes nearby

Living area1,521 ft²
SmallerTypical 1,600 ft²Bigger

Bigger than 46% of homes nearby

Lot size11.42 ac
SmallerTypical 3.18 acBigger

Bigger than 83% of homes nearby

Year built2002
OlderTypical 1996Newer

Newer than 63% of homes nearby

How 13639 Highway 40 ranks against every home in each area.
MeasureThis homeKeystone 57751Pennington County
Estimated valuepricier than$1,950,000almost all homesalmost all homes
Price per ft²pricier than$1282almost all homesalmost all homes
Living areabigger than1,521 ft²46% of homes61% of homes
Lot sizebigger than11.42 ac83% of homes96% of homes
Year builtnewer than200263% of homes74% of homes

About 13639 Highway 40

How much is 13639 Highway 40, Keystone, SD worth?

The TopHap Estimate for 13639 Highway 40, Keystone, SD is $1,950,000 as of Sep 24, 2026. The likely range is $1,156,820 to $2,743,180. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 13639 Highway 40, Keystone, SD last sell?

13639 Highway 40, Keystone, SD last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 13639 Highway 40, Keystone, SD?

13639 Highway 40, Keystone, SD has 3 bedrooms, 3 bathrooms, 1,521 square feet of living space and a 11.42-acre lot.

When was 13639 Highway 40, Keystone, SD built?

13639 Highway 40, Keystone, SD was built in 2002, making it 24 years old. It is a ranch home.

What schools serve 13639 Highway 40, Keystone, SD?

13639 Highway 40, Keystone, SD is assigned to Hermosa Elementary - 04 (elementary), rated B-; Custer High School - 01 (high), rated C+. All sit in Custer School District 16-1. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 13639 Highway 40, Keystone, SD compare to other homes in Keystone 57751?

Among the 447 homes in Keystone 57751, it is worth more than almost all of them ($1,950,000 against a typical $642,512), its price per square foot is higher than almost all of them ($1282 against a typical $443), it is bigger than 46% of them (1,521 ft² against a typical 1,600 ft²), its lot is bigger than 83% of them (11.42 ac against a typical 3.18 ac) and it is newer than 63% of them (2002 against a typical 1996). Measured against all of Pennington County, it is worth more than almost all homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 13639 Highway 40, Keystone, SD?

The 2025 property tax bill for 13639 Highway 40, Keystone, SD was $13,820. The county assessed it at $1,105,500.

More homes on Highway 40

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More homes in Keystone 57751

Assigned schools

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