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Single Family ResidenceResidential
$370,652$180 / 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 80How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026

640 ALLEN AVE

RAPID CITY, SD 57701
5
Beds
2
Baths
2,059 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.
0.47 ac
Lot SizeThe size of the land the home sits on, from county records.
2010
Year BuiltThe year the home was originally built, according to county records.

Valuation

$371K
$297K low$445K high

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.13 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
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.minimal

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.0.47
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.Patio · 150 ft²Porch · 422 ft²

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

H
Central High SchoolD
High · Grades 9–12 · 0.2 mi
E
Horace Mann Elementary SchoolF
Elementary · Grades KG–5 · 0.5 mi
M
North Middle SchoolF
Middle · Grades 6–8 · 0.9 mi

District: Rapid City Area Schools

Neighborhood · ZIP 57701These 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.129
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 100.30

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.18%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.18%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.5%
PopulationHow many people live in this area.45,780
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.728 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$54,251
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$68,885
Average tempThe average temperature here across a full year.47°F
Annual precipHow much rain and melted snow falls here in a typical year.18 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

640 Allen Ave 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 more than 72% of homes in Rapid City 57701
  • Costs less per square foot than 98% of homes in Pennington County
  • Bigger than 82% of homes in Rapid City 57701
  • Has a bigger lot than 89% of homes in Rapid City 57701
  • Newer than 92% of homes in Rapid City 57701

What homes are worth in Rapid City 57701

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

This home
$169K$891K

This home is worth more than 72% of homes in Rapid City 57701.

How it measures up in Rapid City 57701

The dot is this home. The mark in the middle is the typical home in Rapid City 57701.

Estimated value$370,652
CheaperTypical $308,414Pricier

Pricier than 72% of homes nearby

Price per ft²$180
CheaperTypical $295Pricier

Pricier than 3% of homes nearby

Living area2,059 ft²
SmallerTypical 1,152 ft²Bigger

Bigger than 82% of homes nearby

Lot size0.47 ac
SmallerTypical 0.19 acBigger

Bigger than 89% of homes nearby

Year built2010
OlderTypical 1973Newer

Newer than 92% of homes nearby

How 640 Allen Ave ranks against every home in each area.
MeasureThis homeRapid City 57701Pennington County
Estimated valuepricier than$370,65272% of homes49% of homes
Price per ft²pricier than$1803% of homes2% of homes
Living areabigger than2,059 ft²82% of homes76% of homes
Lot sizebigger than0.47 ac89% of homes70% of homes
Year builtnewer than201092% of homes86% of homes

About 640 Allen Ave

How much is 640 Allen Ave, Rapid City, SD worth?

The TopHap Estimate for 640 Allen Ave, Rapid City, SD is $370,652 as of Oct 21, 2026. The likely range is $296,658 to $444,646. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 640 Allen Ave, Rapid City, SD last sell?

640 Allen Ave, Rapid City, SD last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 640 Allen Ave, Rapid City, SD?

640 Allen Ave, Rapid City, SD has 5 bedrooms, 2 bathrooms, 2,059 square feet of living space and a 0.47-acre lot.

When was 640 Allen Ave, Rapid City, SD built?

640 Allen Ave, Rapid City, SD was built in 2010, making it 16 years old. It is a ranch home.

What schools serve 640 Allen Ave, Rapid City, SD?

640 Allen Ave, Rapid City, SD is assigned to Central High School (high), rated D; Horace Mann Elementary School (elementary), rated F; North Middle School (middle), rated F. All sit in Rapid City Area Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 640 Allen Ave, Rapid City, SD compare to other homes in Rapid City 57701?

Among the 14,096 homes in Rapid City 57701, it is worth more than 72% of them ($370,652 against a typical $308,414), its price per square foot is higher than 3% of them ($180 against a typical $295), it is bigger than 82% of them (2,059 ft² against a typical 1,152 ft²), its lot is bigger than 89% of them (0.47 ac against a typical 0.19 ac) and it is newer than 92% of them (2010 against a typical 1973). Measured against all of Pennington County, it is worth more than 49% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

More homes on Allen Ave

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Assigned schools

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