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Single Family ResidenceResidential
$385,106$214 / 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 44How 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

421 RIO GRANDE CIR

ALAMO, TX 78516
3
Beds
2
Baths
1,799 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.
0.63 ac
Lot SizeThe size of the land the home sits on, from county records.
1995
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$385K
$171K low$599K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,851 (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.$153,399 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$79,834
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$73,565
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$168,968
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$153,399

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

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
CountyHIDALGO
Lot (acres)The size of the land the home sits on, from county records.0.63
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
CoolingThe type of cooling or air conditioning in the home.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Carport (Unspecified)
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 · 250 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.

H
Donna North High SchoolD-
High · Grades 9–12 · 1.4 mi
E
Capt. D. Salinas II S.T.E.A.M. AcademyC+
Elementary · Grades PK–5 · 3.6 mi
M
D. M. Sauceda S.T.E.A.M. AcademyD+
Middle · Grades 6–8 · 3.8 mi

District: Donna Independent School District

Neighborhood · ZIP 78516These 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.107
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.86
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.13

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.80%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.9.4%
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.1.8%
PopulationHow many people live in this area.38,800
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.910 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$47,849
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$62,556
Average tempThe average temperature here across a full year.74°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.60%

Owner Tools

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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

421 Rio Grande Cir 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 96% of homes in Alamo 78516
  • Costs more per square foot than 97% of homes in Hidalgo County
  • Bigger than 82% of homes in Alamo 78516
  • Has a bigger lot than 91% of homes in Alamo 78516

What homes are worth in Alamo 78516

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

This home
$72K$481K

This home is worth more than 96% of homes in Alamo 78516.

How it measures up in Alamo 78516

The dot is this home. The mark in the middle is the typical home in Alamo 78516.

Estimated value$385,106
CheaperTypical $181,365Pricier

Pricier than 96% of homes nearby

Price per ft²$214
CheaperTypical $129Pricier

Pricier than 96% of homes nearby

Living area1,799 ft²
SmallerTypical 1,243 ft²Bigger

Bigger than 82% of homes nearby

Lot size0.63 ac
SmallerTypical 0.17 acBigger

Bigger than 91% of homes nearby

Year built1995
OlderTypical 1995Newer

Newer than 51% of homes nearby

How 421 Rio Grande Cir ranks against every home in each area.
MeasureThis homeAlamo 78516Hidalgo County
Estimated valuepricier than$385,10696% of homes92% of homes
Price per ft²pricier than$21496% of homes97% of homes
Living areabigger than1,799 ft²82% of homes69% of homes
Lot sizebigger than0.63 ac91% of homes90% of homes
Year builtnewer than199551% of homes44% of homes

About 421 Rio Grande Cir

How much is 421 Rio Grande Cir, Alamo, TX worth?

The TopHap Estimate for 421 Rio Grande Cir, Alamo, TX is $385,106 as of Sep 24, 2026. The likely range is $171,355 to $598,857. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 421 Rio Grande Cir, Alamo, TX last sell?

421 Rio Grande Cir, Alamo, TX last sold on Sep 26, 1997, according to the county's recorded deed.

How big is 421 Rio Grande Cir, Alamo, TX?

421 Rio Grande Cir, Alamo, TX has 3 bedrooms, 2 bathrooms, 1,799 square feet of living space and a 0.63-acre lot.

When was 421 Rio Grande Cir, Alamo, TX built?

421 Rio Grande Cir, Alamo, TX was built in 1995, making it 31 years old. The building has 1 story.

What schools serve 421 Rio Grande Cir, Alamo, TX?

421 Rio Grande Cir, Alamo, TX is assigned to Donna North High School (high), rated D-; Capt. D. Salinas II S.T.E.A.M. Academy (elementary), rated C+; D. M. Sauceda S.T.E.A.M. Academy (middle), rated D+. All sit in Donna Independent School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 421 Rio Grande Cir, Alamo, TX compare to other homes in Alamo 78516?

Among the 11,719 homes in Alamo 78516, it is worth more than 96% of them ($385,106 against a typical $181,365), its price per square foot is higher than 96% of them ($214 against a typical $129), it is bigger than 82% of them (1,799 ft² against a typical 1,243 ft²), its lot is bigger than 91% of them (0.63 ac against a typical 0.17 ac) and it is newer than 51% of them (1995 against a typical 1995). Measured against all of Hidalgo County, it is worth more than 92% 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 421 Rio Grande Cir, Alamo, TX?

The 2025 property tax bill for 421 Rio Grande Cir, Alamo, TX was $2,851. The county assessed it at $153,399.

More homes on Rio Grande Cir

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