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Single Family ResidentialResidential
$38,201$34 / 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 87How 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

523 UNION ST

HANNIBAL, MO 63401
3
Beds
1
Baths
1,111 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.
0.1 ac
Lot SizeThe size of the land the home sits on, from county records.
1880
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$38K
$33K low$43K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$217 (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.$3,540 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$320
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$3,220
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$3,220
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$18,630

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.119 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.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 Residential
CountyMarion
Lot (acres)The size of the land the home sits on, from county records.0.10
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
CoolingThe type of cooling or air conditioning in the home.None
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 72 ft²

Transaction History(2)

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
A. D. Stowell Elementary SchoolA
Elementary · Grades KG–5 · 0.1 mi
H
Hannibal High SchoolC+
High · Grades 9–12 · 2.4 mi
M
Hannibal Middle SchoolC-
Middle · Grades 6–8 · 2.5 mi

District: Hannibal 60 School District

Neighborhood · ZIP 63401These 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.105
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.76
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.40

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.88%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.16%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.12%
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.21,152
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.177 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$62,165
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$71,961
Average tempThe average temperature here across a full year.53°F
Annual precipHow much rain and melted snow falls here in a typical year.39 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.56%

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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

523 Union 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 Hannibal 63401
  • Costs less per square foot than 98% of homes in Marion County
  • Smaller than 77% of homes in Marion County
  • Has a smaller lot than 81% of homes in Marion County
  • Older than 96% of homes in Hannibal 63401

What homes are worth in Hannibal 63401

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

This home
$46K$548K

This home is worth less than almost all homes in Hannibal 63401.

How it measures up in Hannibal 63401

The dot is this home. The mark in the middle is the typical home in Hannibal 63401.

Estimated value$38,201
CheaperTypical $173,305Pricier

Cheaper than almost all homes nearby

Price per ft²$34
CheaperTypical $130Pricier

Pricier than 3% of homes nearby

Living area1,111 ft²
SmallerTypical 1,454 ft²Bigger

Bigger than 25% of homes nearby

Lot size0.1 ac
SmallerTypical 0.3 acBigger

Bigger than 24% of homes nearby

Year built1880
OlderTypical 1957Newer

Newer than 4% of homes nearby

How 523 Union St ranks against every home in each area.
MeasureThis homeHannibal 63401Marion County
Estimated valuepricier than$38,201almost no homesalmost no homes
Price per ft²pricier than$343% of homes2% of homes
Living areabigger than1,111 ft²25% of homes23% of homes
Lot sizebigger than0.1 ac24% of homes19% of homes
Year builtnewer than18804% of homes4% of homes

About 523 Union St

How much is 523 Union St, Hannibal, MO worth?

The TopHap Estimate for 523 Union St, Hannibal, MO is $38,201 as of Sep 24, 2026. The likely range is $33,356 to $43,046. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 523 Union St, Hannibal, MO last sell?

523 Union St, Hannibal, MO last sold on Jan 12, 2018, according to the county's recorded deed.

How big is 523 Union St, Hannibal, MO?

523 Union St, Hannibal, MO has 3 bedrooms, 1 bathrooms, 1,111 square feet of living space and a 0.10-acre lot.

When was 523 Union St, Hannibal, MO built?

523 Union St, Hannibal, MO was built in 1880, making it 146 years old. The building has 1 story.

What schools serve 523 Union St, Hannibal, MO?

523 Union St, Hannibal, MO is assigned to A. D. Stowell Elementary School (elementary), rated A; Hannibal High School (high), rated C+; Hannibal Middle School (middle), rated C-. All sit in Hannibal 60 School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 523 Union St, Hannibal, MO compare to other homes in Hannibal 63401?

Among the 8,765 homes in Hannibal 63401, it is worth more than almost none of them ($38,201 against a typical $173,305), its price per square foot is higher than 3% of them ($34 against a typical $130), it is bigger than 25% of them (1,111 ft² against a typical 1,454 ft²), its lot is bigger than 24% of them (0.1 ac against a typical 0.3 ac) and it is newer than 4% of them (1880 against a typical 1957). Measured against all of Marion 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 523 Union St, Hannibal, MO?

The 2025 property tax bill for 523 Union St, Hannibal, MO was $217. The county assessed it at $3,540.

More homes on Union St

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