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St. Mary's County, MD Parcels & GIS Data

St. Mary's County, MD parcel data: 53,059 property records with owner names, assessed values, land use, acreage, and addresses. Preview and download.

Land Records publishes St. Mary's County, Maryland parcel data covering 53,059 property records.

This page documents parcel-level coverage for St. Mary's County, Maryland. Each parcel record carries its boundary polygon (GIS geometry) along with attributes such as the parcel ID/APN, owner name and mailing address, situs (property) address, assessed land and improvement values, acreage, land-use and zoning codes, year built, and most recent sale price and date. Exact fill rates for St. Mary's County are listed in the attribute-coverage table below. Preview the data in the interactive explorer, or download the complete St. Mary's County property dataset.

St. Mary's County, established in 1637, is a county located in the U.S. state of Maryland. As of the 2020 census, the population was 113,777.

FIPS 24037

Official county website: http://www.co.saint-marys.md.us

The FIPS code for St. Mary's County is 24037.

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Attribute coverage

St. Mary's County contains 53,059 parcels in the current dataset. Column coverage is the percentage of those parcels for which the attribute is populated (non-NULL).

ColumnCoverageRecords populated
lrid100%53,059
parcelid98.4%52,216
parcelid298.4%52,216
ogparcelid98.4%52,216
ogparcelid298.4%52,216
parentid<0.1%0
stackid<0.1%0
geoid100%53,059
statefp100%53,059
countyfp100%53,059
countyname100%53,059
cousubfp100%53,059
cousubname100%53,059
tractce100%53,059
tractname100%53,059
taxacctnum98.4%52,214
taxyear98.4%52,204
taxdistrict<0.1%11
usecode20.4%10,825
usedesc95.9%50,896
zoningcode88.4%46,904
zoningdesc<0.1%0
numbldgs83.1%44,115
numunits78.9%41,872
yearbuilt<0.1%0
numfloors56.7%30,088
bldgsqft74.6%39,559
bedrooms<0.1%0
halfbaths<0.1%0
fullbaths<0.1%0
imprvalue93.2%49,453
landvalue93.2%49,453
agvalue78.2%41,508
totalvalue93.2%49,453
taxacres<0.1%0
calcarea100%53,059
saleamt61.2%32,447
saledate90.4%47,941
ownertype97.1%51,521
ownername97.1%51,521
owneraddr95.3%50,572
ownercity<0.1%1
ownerstate<0.1%1
ownerzip<0.1%1
parceladdr99.1%52,597
parcelcity94.7%50,246
parcelstate100%53,059
parcelzip100%53,046
legaldesc95.4%50,611
township<0.1%0
section<0.1%0
qtrsection<0.1%0
range<0.1%0
plssdesc<0.1%0
book34.3%18,175
page34.2%18,143
block13.4%7,120
lot68.6%36,398
parceltype3.8%2,012
accesstype3.8%2,012
iucnclass1.4%768
placename7.1%3,746
placetype6.8%3,619
firmid<0.1%0
firmdate<0.1%0
fldzone<0.1%0
zonesubty<0.1%0
staticbfe<0.1%0
elevmin100%53,049
elevmax100%53,049
elevavg100%53,049
fireplaces<0.1%0
heating<0.1%0
heatfuel<0.1%0
cooling<0.1%0
foundation<0.1%0
roofcover<0.1%0
siding<0.1%0
bldgtype<0.1%0
naicscode1.5%784
frsid0.3%184
dfrurl0.3%184
caapermit0.3%184
cwapermit0.3%184
rcrapermit0.3%184
updated100%53,058
centroidx100%53,059
centroidy100%53,059
surfpointx100%53,059
surfpointy100%53,059
geom100%53,059
extras<0.1%11
ownerlist96.1%50,967
placefp38.5%20,404
zoningurl<0.1%0

Schema mapping

How source columns from the acquired St. Mary's County GIS layers map into the harmonized entity schemas and assemble into the published parcel table, alongside supplemented fields (elevation, flood zone) and deterministic columns.

Schema mapping — St. Mary's County, Maryland (24037) 1 entity · most recent acquisition per entity · generated 2026-08-15 direct column transformed (expression) geometry extras json supplemented determined ALL ENTITIES → FINAL PARCEL SCHEMA Harmonized entity columns assemble into publish.parcel_layer — matched by column name. Supplemented fields show their fill rate in this county. SOURCE COLUMNS HARMONIZED ENTITIES PUBLISH.PARCEL_LAYER PARCEL parcel polyid acctid ciuse descciuse zoning bldg_units yearblt bldg_story sqftstrc nfmimpvl nfmlndvl nfmttlvl acres considr1 tradate ownadd1 ownadd2 owncity ownstate ownerzip address city zipcode legal1 legal2 legal3 dr1liber dr1folio block lot sdatwebadr geom desctown jurscode geogcode ooi resityp strtnum strtdir strtnam strttyp strtsfx strtunt addrtyp ownzip2 premsnum premsdir premsnam premstyp premcity premzip premzip2 towncode subdivsn dsubcode descsubd plat pltliber pltfolio section map grid znchgdat rzrealdat exclass descexcl lu desclu landarea luom width depth pfuw pfus pflw pfsp pfsu pfic pfih recind permittyp strugrad descgrad strucnst desccnst strustyl descstyl strubldg descbldg lastinsp lastassd assessor gr1libr1 gr1folo1 convey1 crtarcod fcmacode agfndarea entzndat entznassm plndevdat nprctstdat nprcarea nprcluom homqlcod homqldat ptype mdpvdate sdatdate polydate polyacres shape_starea__ shape_stlength__ parcelid parcelid2 taxacctnum usecode usedesc zoningcode numunits yearbuilt numfloors bldgsqft imprvalue landvalue totalvalue taxacres saleamt saledate owneraddr ownercity ownerstate ownerzip parceladdr parcelcity parcelstate parcelzip legaldesc book page block lot sourceurl geom taxdistrict extras determined · ground truth 100% lrid 100% geoid 100% statefp 100% countyfp 100% countyname 100% cousubfp 100% cousubname 100% tractce 100% tractname 98.4% taxyear 100% updated geom · derived from geometry geom dem.us_1m · USGS 1m DEM 100% elevmin 100% elevmax 100% elevavg supplemented · derived / other pipelines 83.1% numbldgs 78.2% agvalue 97.1% ownertype 97.1% ownername 96.1% ownerlist lrid parcelid parcelid2 ogparcelid ogparcelid2 geoid statefp countyfp countyname cousubfp cousubname tractce tractname taxacctnum taxyear taxdistrict usecode usedesc zoningcode numbldgs numunits yearbuilt numfloors bldgsqft imprvalue landvalue agvalue totalvalue taxacres calcarea saleamt saledate ownertype ownername owneraddr ownercity ownerstate ownerzip parceladdr parcelcity parcelstate parcelzip legaldesc book page block lot elevmin elevmax elevavg updated centroidx centroidy surfpointx surfpointy geom extras ownerlist publish.parcel_layer columns not fed by these sources (37) — empty or below 50% fill in this county parentid, stackid, zoningdesc, bedrooms, halfbaths, fullbaths, township, section, qtrsection, range, plssdesc, parceltype, accesstype iucnclass, placename, placetype, firmid, firmdate, fldzone, zonesubty, staticbfe, fireplaces, heating, heatfuel, cooling, foundation, roofcover siding, bldgtype, naicscode, frsid, dfrurl, caapermit, cwapermit, rcrapermit, placefp, zoningurl PARCEL 33 mapped · 4 transformed · 22 unmapped (NULL) SOURCE COLUMNS HARMONIZED → PARCEL parcel polyid acctid ciuse descciuse zoning bldg_units yearblt bldg_story sqftstrc nfmimpvl nfmlndvl nfmttlvl acres considr1 tradate ownadd1 ownadd2 owncity ownstate ownerzip address city zipcode legal1 legal2 legal3 dr1liber dr1folio block lot sdatwebadr geom desctown jurscode geogcode ooi resityp strtnum strtdir strtnam strttyp strtsfx strtunt addrtyp ownzip2 premsnum premsdir premsnam premstyp premcity premzip premzip2 towncode subdivsn dsubcode descsubd plat pltliber pltfolio section map grid znchgdat rzrealdat exclass descexcl lu desclu landarea luom width depth pfuw pfus pflw pfsp pfsu pfic pfih recind permittyp strugrad descgrad strucnst desccnst strustyl descstyl strubldg descbldg lastinsp lastassd assessor gr1libr1 gr1folo1 convey1 crtarcod fcmacode agfndarea entzndat entznassm plndevdat nprctstdat nprcarea nprcluom homqlcod homqldat ptype mdpvdate sdatdate polydate polyacres shape_starea__ shape_stlength__ parcelid parcelid2 taxacctnum usecode usedesc zoningcode numunits yearbuilt numfloors bldgsqft imprvalue landvalue totalvalue taxacres saleamt saledate owneraddr NULLIF(concat_ws(' ', NULLIF(ownadd1, ''), NULLIF(ownadd2, ''))… ownercity ownerstate ownerzip parceladdr parcelcity parcelstate 'MD'::text parcelzip legaldesc NULLIF(concat_ws('; ', NULLIF(legal1, ''), NULLIF(legal2, ''), … book page block lot sourceurl geom taxdistrict extras ( json_build_object( 'jurscode', jurscode::text, 'geogcode', ge… not present in source — filled with NULL (22) taxyear, zoningdesc, numbldgs, bedrooms, halfbaths, fullbaths, agvalue, ownername, township, section, qtrsection, range, plssdesc, updated parentid, fireplaces, heating, cooling, foundation, roofcover, siding, heatfuel

Neighboring counties

Parcel data for counties bordering St. Mary's County:

Frequently asked questions

Where can I find St. Mary's County, MD parcel and GIS data?

Land Records publishes a St. Mary's County, MD parcel dataset in which every parcel carries its boundary polygon (GIS geometry) along with ownership, assessed value, land use, acreage, and sale history. Preview it in the interactive explorer on this page, or download the full St. Mary's County, MD dataset as a GeoPackage or CSV.

How many parcels are in St. Mary's County, MD?

The current dataset contains 53,059 parcel records for St. Mary's County, MD, each with its boundary geometry and assessor attributes.

What is the FIPS code for St. Mary's County, MD?

The FIPS code for St. Mary's County, MD is 24037.

What information does each St. Mary's County, MD parcel record include?

Each St. Mary's County, MD parcel record includes the parcel ID/APN, owner name and mailing address, situs (property) address, assessed land and improvement values, acreage, land-use and zoning codes, year built, and the most recent sale price and date — plus the parcel boundary polygon. Per-attribute fill rates are listed in the coverage table on this page.

Is St. Mary's County, MD parcel data free?

You can preview St. Mary's County, MD parcels for free in the interactive explorer. The complete dataset is available as a one-time download or through the nationwide parcel web service; see the download options on this page for current pricing.

Does St. Mary's County, MD have an official GIS or property records website?

Yes — the official St. Mary's County, MD government website is linked in the county details above. Land Records standardizes St. Mary's County, MD assessor and recorder records into a single nationwide parcel schema with GIS boundary geometry.

On this page

Attribute coverageSchema mappingNeighboring countiesFAQRelated