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Single Family ResidenceResidential
$296,239$166 / 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 Jul 14, 2026

20180 S RIVER RD

MAMMOTH, AZ 85618
0
Baths
1,784 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.
6.22 ac
Lot SizeThe size of the land the home sits on, from county records.
1970
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$296K
$278K low$315K high
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$296,239
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$236,991

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$389 (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.$14,114 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,613
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$12,501
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$14,114
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$141,144

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.106 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
CountyPinal
Lot (acres)The size of the land the home sits on, from county records.6.22
ConstructionThe main material the home's frame and walls are built from.Steel Frame
RoofThe main material covering the roof, such as asphalt shingle or tile.Roll Composition (rolled Mineral Roof)
HeatingThe type of heating system in the home.None
FireplaceWhether the home has a fireplace, and what kind.Yes
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.Porch · 140 ft²

Transaction History(1)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

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

M
San Manuel Jr. High SchoolC-
Middle · Grades 6–8 · 6.6 mi
H
San Manuel High SchoolD
High · Grades 9–12 · 6.6 mi
E
San Manuel Elementary SchoolC+
Elementary · Grades PK–5 · 6.7 mi

District: Mammoth-San Manuel Unified District

Neighborhood · ZIP 85618These 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.152
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.103
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.65

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.84%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.1.6%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.26%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.8%
PopulationHow many people live in this area.1,516
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.31 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$39,005
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$50,848
Average tempThe average temperature here across a full year.65°F
Annual precipHow much rain and melted snow falls here in a typical year.17 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.86%

Ownership

Company ownedWhether the owner is a company or trust rather than a person.No

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

20180 S River Rd 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 95% of homes in Mammoth 85618
  • Costs more per square foot than 88% of homes in Mammoth 85618
  • Bigger than 84% of homes in Mammoth 85618
  • Among the largest lots in Pinal County
  • Older than 94% of homes in Pinal County

What homes are worth in Mammoth 85618

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

This home
$42K$409K

This home is worth more than 95% of homes in Mammoth 85618.

How it measures up in Mammoth 85618

The dot is this home. The mark in the middle is the typical home in Mammoth 85618.

Estimated value$296,239
CheaperTypical $132,440Pricier

Pricier than 95% of homes nearby

Price per ft²$166
CheaperTypical $109Pricier

Pricier than 88% of homes nearby

Living area1,784 ft²
SmallerTypical 1,202 ft²Bigger

Bigger than 84% of homes nearby

Lot size6.22 ac
SmallerTypical 0.23 acBigger

Bigger than 98% of homes nearby

Year built1970
OlderTypical 1970Newer

Newer than 51% of homes nearby

How 20180 S River Rd ranks against every home in each area.
MeasureThis homeMammoth 85618Pinal County
Estimated valuepricier than$296,23995% of homes24% of homes
Price per ft²pricier than$16688% of homes25% of homes
Living areabigger than1,784 ft²84% of homes47% of homes
Lot sizebigger than6.22 ac98% of homesalmost all homes
Year builtnewer than197051% of homes6% of homes

About 20180 S River Rd

How much is 20180 S River Rd, Mammoth, AZ worth?

The TopHap Estimate for 20180 S River Rd, Mammoth, AZ is $296,239 as of Jul 14, 2026. The likely range is $277,588 to $314,890. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

How big is 20180 S River Rd, Mammoth, AZ?

20180 S River Rd, Mammoth, AZ has 1,784 square feet of living space and a 6.22-acre lot.

When was 20180 S River Rd, Mammoth, AZ built?

20180 S River Rd, Mammoth, AZ was built in 1970, making it 56 years old. The building has 1 story.

What schools serve 20180 S River Rd, Mammoth, AZ?

20180 S River Rd, Mammoth, AZ is assigned to San Manuel Jr. High School (middle), rated C-; San Manuel High School (high), rated D; San Manuel Elementary School (elementary), rated C+. All sit in Mammoth-San Manuel Unified District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20180 S River Rd, Mammoth, AZ compare to other homes in Mammoth 85618?

Among the 629 homes in Mammoth 85618, it is worth more than 95% of them ($296,239 against a typical $132,440), its price per square foot is higher than 88% of them ($166 against a typical $109), it is bigger than 84% of them (1,784 ft² against a typical 1,202 ft²), its lot is bigger than 98% of them (6.22 ac against a typical 0.23 ac) and it is newer than 51% of them (1970 against a typical 1970). Measured against all of Pinal 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 20180 S River Rd, Mammoth, AZ?

The 2025 property tax bill for 20180 S River Rd, Mammoth, AZ was $389. The county assessed it at $14,114.

Closest homes

More homes in Mammoth 85618

Assigned schools

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