Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$125,658$233 / 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 85How 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
Last sold for $170,572 on Dec 1, 2022

421 ARMSTRONG ST

SAN MARCOS, TX 78666
0
Baths
540 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.
0.17 ac
Lot SizeThe size of the land the home sits on, from county records.
1945
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$126K
$107K low$144K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$170,572 · Dec 1, 2022

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,372 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$125,440 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$55,760
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$69,680
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$126,850
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$125,440

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.70 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.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
CountyHAYS
Lot (acres)The size of the land the home sits on, from county records.0.17
RoofThe main material covering the roof, such as asphalt shingle or tile.Metal
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(4)

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.

E
Hernandez Elementary SchoolA-
Elementary · Grades KG–5 · 1.6 mi
M
Miller Middle SchoolC+
Middle · Grades 6–8 · 1.9 mi
H
San Marcos High SchoolC-
High · Grades 9–12 · 3.4 mi

District: San Marcos Consolidated Independent School District

Neighborhood · ZIP 78666These 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.131
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.72
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.16

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.22%
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.1.1%
PopulationHow many people live in this area.99,796
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.548 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$54,287
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$69,670
Average tempThe average temperature here across a full year.68°F
Annual precipHow much rain and melted snow falls here in a typical year.37 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.60%

Owner Tools

Do you own this home?
Claim this home

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 Armstrong 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.

  • Among the least valuable homes in San Marcos 78666
  • Costs more per square foot than 85% of homes in Victory Gardens
  • Among the smallest homes in San Marcos 78666
  • Has a smaller lot than 73% of homes in San Marcos 78666
  • Among the oldest homes in Hays County

What homes are worth in San Marcos 78666

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

This home
$161K$890K

This home is worth less than almost all homes in San Marcos 78666.

How it measures up in San Marcos 78666

The dot is this home. The mark in the middle is the typical home in San Marcos 78666.

Estimated value$125,658
CheaperTypical $316,482Pricier

Cheaper than almost all homes nearby

Price per ft²$233
CheaperTypical $192Pricier

Pricier than 77% of homes nearby

Living area540 ft²
SmallerTypical 1,654 ft²Bigger

Smaller than almost all homes nearby

Lot size0.17 ac
SmallerTypical 0.34 acBigger

Bigger than 27% of homes nearby

Year built1945
OlderTypical 2010Newer

Older than almost all homes nearby

How 421 Armstrong St ranks against every home in each area.
MeasureThis homeVictory GardensSan Marcos 78666Hays County
Estimated valuepricier than$125,6583% of homesalmost no homesalmost no homes
Price per ft²pricier than$23385% of homes77% of homes67% of homes
Living areabigger than540 ft²4% of homesalmost no homesalmost no homes
Lot sizebigger than0.17 ac71% of homes27% of homes31% of homes
Year builtnewer than19454% of homesalmost no homesalmost no homes

About 421 Armstrong St

How much is 421 Armstrong St, San Marcos, TX worth?

The TopHap Estimate for 421 Armstrong St, San Marcos, TX is $125,658 as of Sep 24, 2026. The likely range is $107,305 to $144,011. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 421 Armstrong St, San Marcos, TX last sell?

421 Armstrong St, San Marcos, TX last sold on Dec 1, 2022 for $170,572, according to the county's recorded deed.

How big is 421 Armstrong St, San Marcos, TX?

421 Armstrong St, San Marcos, TX has 540 square feet of living space and a 0.17-acre lot.

When was 421 Armstrong St, San Marcos, TX built?

421 Armstrong St, San Marcos, TX was built in 1945, making it 81 years old. The building has 1 story.

What schools serve 421 Armstrong St, San Marcos, TX?

421 Armstrong St, San Marcos, TX is assigned to Hernandez Elementary School (elementary), rated A-; Miller Middle School (middle), rated C+; San Marcos High School (high), rated C-. All sit in San Marcos Consolidated Independent School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 421 Armstrong St, San Marcos, TX compare to other homes in San Marcos 78666?

Among the 22,690 homes in San Marcos 78666, it is worth more than almost none of them ($125,658 against a typical $316,482), its price per square foot is higher than 77% of them ($233 against a typical $192), it is bigger than almost none of them (540 ft² against a typical 1,654 ft²), its lot is bigger than 27% of them (0.17 ac against a typical 0.34 ac) and it is newer than almost none of them (1945 against a typical 2010). Measured against all of Hays County, it is worth more than almost no 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 Armstrong St, San Marcos, TX?

The 2024 property tax bill for 421 Armstrong St, San Marcos, TX was $1,372. The county assessed it at $125,440.

More homes on Armstrong St

Closest homes

More homes in San Marcos 78666

Assigned schools

Explore the area

See this home in context

Open 421 Armstrong St on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map