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Single Family ResidenceResidential
$293,876$296 / 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 93How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026

405 SWANZEY ST

KEYSTONE, SD 57751
2
Beds
1
Baths
992 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.
3,920 ft²
Lot SizeThe size of the land the home sits on, from county records.
1963
Year BuiltThe year the home was originally built, according to county records.

Valuation

$294K
$273K low$315K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,493 (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.$202,300 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$37,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$165,200
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$202,300

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.120 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.0.09
PoolWhether the property has a pool, and what kind, such as in-ground.No

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

M
Hill City Middle School - 04B
Middle · Grades 6–8 · 8.2 mi
H
Hill City High School - 01A
High · Grades 9–12 · 8.2 mi
E
Hill City Elementary - 02A-
Elementary · Grades PK–5 · 8.2 mi

District: Hill City School District 51-2

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

405 Swanzey St 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.

  • Worth less than 87% of homes in Keystone 57751
  • Costs less per square foot than 80% of homes in Keystone 57751
  • Smaller than 82% of homes in Keystone 57751
  • Has a smaller lot than 98% of homes in Keystone 57751
  • Older than 79% of homes in Keystone 57751

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
$184K$1.7M

This home is worth more than 13% of 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$293,876
CheaperTypical $608,745Pricier

Pricier than 13% of homes nearby

Price per ft²$296
CheaperTypical $402Pricier

Pricier than 20% of homes nearby

Living area992 ft²
SmallerTypical 1,600 ft²Bigger

Bigger than 18% of homes nearby

Lot size3,920 ft²
SmallerTypical 3.18 acBigger

Bigger than 2% of homes nearby

Year built1963
OlderTypical 1996Newer

Newer than 21% of homes nearby

How 405 Swanzey St ranks against every home in each area.
MeasureThis homeKeystone 57751Pennington County
Estimated valuepricier than$293,87613% of homes24% of homes
Price per ft²pricier than$29620% of homes36% of homes
Living areabigger than992 ft²18% of homes22% of homes
Lot sizebigger than3,920 ft²2% of homes2% of homes
Year builtnewer than196321% of homes28% of homes

About 405 Swanzey St

How much is 405 Swanzey St, Keystone, SD worth?

The TopHap Estimate for 405 Swanzey St, Keystone, SD is $293,876 as of Aug 30, 2026. The likely range is $273,174 to $314,578. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 405 Swanzey St, Keystone, SD last sell?

405 Swanzey St, Keystone, SD last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 405 Swanzey St, Keystone, SD?

405 Swanzey St, Keystone, SD has 2 bedrooms, 1 bathrooms, 992 square feet of living space and a 0.09-acre lot.

When was 405 Swanzey St, Keystone, SD built?

405 Swanzey St, Keystone, SD was built in 1963, making it 63 years old. It is a ranch home.

What schools serve 405 Swanzey St, Keystone, SD?

405 Swanzey St, Keystone, SD is assigned to Hill City Middle School - 04 (middle), rated B; Hill City High School - 01 (high), rated A; Hill City Elementary - 02 (elementary), rated A-. All sit in Hill City School District 51-2. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 405 Swanzey St, Keystone, SD compare to other homes in Keystone 57751?

Among the 448 homes in Keystone 57751, it is worth more than 13% of them ($293,876 against a typical $608,745), its price per square foot is higher than 20% of them ($296 against a typical $402), it is bigger than 18% of them (992 ft² against a typical 1,600 ft²), its lot is bigger than 2% of them (3,920 ft² against a typical 3.18 ac) and it is newer than 21% of them (1963 against a typical 1996). Measured against all of Pennington County, it is worth more than 24% of 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 405 Swanzey St, Keystone, SD?

The 2025 property tax bill for 405 Swanzey St, Keystone, SD was $2,493. The county assessed it at $202,300.

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