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Single Family ResidenceResidential
$339,133$194 / 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 94How 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

136 MORTENSEN LN

SPEARFISH, SD 57783
3
Baths
1,748 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.
0.98 ac
Lot SizeThe size of the land the home sits on, from county records.
1974
Year BuiltThe year the home was originally built, according to county records.

Valuation

$339K
$318K low$360K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,949 (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.$235,580 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$89,710
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$145,870
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$225,620
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$205,810

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyLAWRENCE
Lot (acres)The size of the land the home sits on, from county records.0.98
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.

E
West Elementary - 03
Elementary · Grades 1–2 · 0.6 mi
M
Spearfish Middle School - 05B-
Middle · Grades 6–8 · 0.8 mi
H
Spearfish High School - 01B+
High · Grades 9–12 · 0.8 mi

District: Spearfish School District 40-2

Neighborhood · ZIP 57783These 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.86
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.105
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.33

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.92%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.4%
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.17,419
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.84 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$68,002
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$88,688
Average tempThe average temperature here across a full year.44°F
Annual precipHow much rain and melted snow falls here in a typical year.24 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

136 Mortensen Ln 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 84% of homes in Spearfish 57783
  • Costs less per square foot than 98% of homes in Spearfish 57783
  • Bigger than 73% of homes in Spearfish 57783
  • Has a bigger lot than 72% of homes in Spearfish 57783
  • Older than 78% of homes in Spearfish 57783

What homes are worth in Spearfish 57783

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

This home
$261K$1.5M

This home is worth more than 16% of homes in Spearfish 57783.

How it measures up in Spearfish 57783

The dot is this home. The mark in the middle is the typical home in Spearfish 57783.

Estimated value$339,133
CheaperTypical $483,745Pricier

Pricier than 16% of homes nearby

Price per ft²$194
CheaperTypical $340Pricier

Pricier than 2% of homes nearby

Living area1,748 ft²
SmallerTypical 1,372 ft²Bigger

Bigger than 73% of homes nearby

Lot size0.98 ac
SmallerTypical 0.28 acBigger

Bigger than 72% of homes nearby

Year built1974
OlderTypical 1995Newer

Newer than 22% of homes nearby

How 136 Mortensen Ln ranks against every home in each area.
MeasureThis homeSpearfish 57783Lawrence County
Estimated valuepricier than$339,13316% of homes22% of homes
Price per ft²pricier than$1942% of homes9% of homes
Living areabigger than1,748 ft²73% of homes72% of homes
Lot sizebigger than0.98 ac72% of homes61% of homes
Year builtnewer than197422% of homes32% of homes

About 136 Mortensen Ln

How much is 136 Mortensen Ln, Spearfish, SD worth?

The TopHap Estimate for 136 Mortensen Ln, Spearfish, SD is $339,133 as of Oct 21, 2026. The likely range is $317,818 to $360,448. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 136 Mortensen Ln, Spearfish, SD last sell?

136 Mortensen Ln, Spearfish, SD last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 136 Mortensen Ln, Spearfish, SD?

136 Mortensen Ln, Spearfish, SD has 3 bathrooms, 1,748 square feet of living space and a 0.98-acre lot.

When was 136 Mortensen Ln, Spearfish, SD built?

136 Mortensen Ln, Spearfish, SD was built in 1974, making it 52 years old.

What schools serve 136 Mortensen Ln, Spearfish, SD?

136 Mortensen Ln, Spearfish, SD is assigned to West Elementary - 03 (elementary); Spearfish Middle School - 05 (middle), rated B-; Spearfish High School - 01 (high), rated B+. All sit in Spearfish School District 40-2. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 136 Mortensen Ln, Spearfish, SD compare to other homes in Spearfish 57783?

Among the 7,135 homes in Spearfish 57783, it is worth more than 16% of them ($339,133 against a typical $483,745), its price per square foot is higher than 2% of them ($194 against a typical $340), it is bigger than 73% of them (1,748 ft² against a typical 1,372 ft²), its lot is bigger than 72% of them (0.98 ac against a typical 0.28 ac) and it is newer than 22% of them (1974 against a typical 1995). Measured against all of Lawrence County, it is worth more than 22% 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 136 Mortensen Ln, Spearfish, SD?

The 2025 property tax bill for 136 Mortensen Ln, Spearfish, SD was $2,949. The county assessed it at $235,580.

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