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

St. Mary's County, MD parcel data: 52,205 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 52,205 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 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 52,205 parcels in the current dataset. Column coverage is the percentage of those parcels for which the attribute is populated (non-NULL). For the LBCS columns, only real classifications count: the to-be-determined and not-applicable placeholder codes are excluded.

ColumnCoverageRecords populated
lrid100%52,205
parcelid100%52,205
parcelid299.8%52,100
ogparcelid100%52,205
ogparcelid298.6%51,496
parentid<0.1%0
stackid<0.1%0
geoid100%52,205
statefp100%52,205
countyfp100%52,205
countyname100%52,205
cousubfp100%52,205
cousubname100%52,205
tractce100%52,205
tractname100%52,205
taxacctnum100%52,204
taxyear100%52,205
taxdistrict3.5%1,853
usecode97.3%50,787
usedesc97.4%50,843
zoningcode89.8%46,906
zoningdesc<0.1%0
numbldgs80.5%42,039
numunits100%52,205
yearbuilt77.8%40,607
numfloors100%52,205
bldgsqft100%52,205
bedrooms<0.1%0
halfbaths<0.1%0
fullbaths<0.1%0
imprvalue100%52,205
landvalue100%52,205
agvalue68.5%35,773
totalvalue100%52,205
taxacres100%52,205
calcarea100%52,205
saleamt100%52,205
saledate92.1%48,094
ownertype83.4%43,525
ownername83.4%43,525
owneraddr96.9%50,568
ownercity96.9%50,563
ownerstate96.8%50,557
ownerzip96.8%50,556
parceladdr84.4%44,036
parcelcity97.0%50,635
parcelstate100%52,205
parcelzip100%52,205
legaldesc96.9%50,602
township<0.1%0
section<0.1%0
qtrsection<0.1%0
range<0.1%0
plssdesc<0.1%0
book90.5%47,228
page90.4%47,212
block13.6%7,119
lot69.8%36,413
parceltype0.6%303
accesstype2.3%1,192
iucnclass1.2%608
placename5.4%2,819
placetype5.4%2,793
firmid100%52,205
firmdate100%52,205
fldzone100%52,205
zonesubty96.2%50,246
staticbfe3.3%1,728
elevmin99.2%51,800
elevmax99.2%51,800
elevavg99.2%51,800
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
naicscode3.2%1,670
frsid<0.1%0
dfrurl<0.1%0
caapermit<0.1%0
cwapermit<0.1%0
rcrapermit<0.1%0
updated100%52,205
centroidx100%52,205
centroidy100%52,205
surfpointx100%52,205
surfpointy100%52,205
geom100%52,205
extras100%52,205
ownerlist70.2%36,644
placefp38.9%20,327
zoningurl89.5%46,716
lbcsactivity95.6%49,914
lbcsfunction95.6%49,897
lbcstype95.5%49,831
lbcscharacter96.9%50,589
lbcsownership83.8%43,738
sourceurl97.0%50,635

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) 2 entities · most recent acquisition per entity · generated 2026-10-17 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 polyid map grid parcel acctid lu desclu zoning bldg_units yearblt bldg_story sqftstrc nfmimpvl nfmlndvl nfmttlvl acres considr1 tradate ownadd1 ownadd2 owncity ownstate ownerzip address city zipcode legal1 legal2 legal3 section pltliber pltfolio block lot polydate sdatwebadr geom desctown id jurscode geogcode ooi resityp strtnum strtdir strtnam strttyp strtsfx strtunt addrtyp ownzip2 premsnum premsdir premsnam premstyp premcity premzip premzip2 dr1liber dr1folio towncode subdivsn dsubcode descsubd plat znchgdat rzrealdat ciuse descciuse exclass descexcl 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 polyacres starea__ stlength__ parcelid parcelid2 taxacctnum usecode usedesc zoningcode numunits yearbuilt numfloors bldgsqft imprvalue landvalue totalvalue taxacres saleamt saledate owneraddr ownercity ownerstate ownerzip parceladdr parcelcity parcelzip legaldesc section book page block lot updated sourceurl geom taxdistrict extras ZONING genzone source geom jurscode municipality_name abbreviation updateyr acres genzone_cat shape_starea__ shape_stlength__ globalid created_user created_date last_edited_user last_edited_date zoningcode sourceurl geom extras determined · ground truth 100% lrid 100% geoid 100% statefp 100% countyfp 100% countyname 100% cousubfp 100% cousubname 100% tractce 100% tractname 100% taxyear geom · derived from geometry geom dem.us_1m · USGS 1m DEM 99.2% elevmin 99.2% elevmax 99.2% elevavg s_fld_haz_ar · FEMA NFHL 100% fldzone 96.2% zonesubty 3.3% staticbfe 100% firmdate 100% firmid supplemented · derived / other pipelines 80.5% numbldgs 68.5% agvalue 83.4% ownertype 83.4% ownername 100% parcelstate 70.2% ownerlist 89.5% zoningurl 95.6% lbcsactivity 95.6% lbcsfunction 95.5% lbcstype 96.9% lbcscharacter 83.8% lbcsownership 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 section book page block lot firmid firmdate fldzone zonesubty staticbfe elevmin elevmax elevavg updated centroidx centroidy surfpointx surfpointy geom extras ownerlist zoningurl lbcsactivity lbcsfunction lbcstype lbcscharacter lbcsownership sourceurl publish.parcel_layer columns not fed by these sources (30) — empty or below 50% fill in this county parentid, stackid, zoningdesc, bedrooms, halfbaths, fullbaths, township, qtrsection, range, plssdesc, parceltype, accesstype, iucnclass placename, placetype, fireplaces, heating, heatfuel, cooling, foundation, roofcover, siding, bldgtype, naicscode, frsid, dfrurl, caapermit cwapermit, rcrapermit, placefp PARCEL 34 mapped · 4 transformed · 21 unmapped (NULL) SOURCE COLUMNS HARMONIZED → PARCEL polyid map grid parcel acctid lu desclu zoning bldg_units yearblt bldg_story sqftstrc nfmimpvl nfmlndvl nfmttlvl acres considr1 tradate ownadd1 ownadd2 owncity ownstate ownerzip address city zipcode legal1 legal2 legal3 section pltliber pltfolio block lot polydate sdatwebadr geom desctown id jurscode geogcode ooi resityp strtnum strtdir strtnam strttyp strtsfx strtunt addrtyp ownzip2 premsnum premsdir premsnam premstyp premcity premzip premzip2 dr1liber dr1folio towncode subdivsn dsubcode descsubd plat znchgdat rzrealdat ciuse descciuse exclass descexcl 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 polyacres starea__ stlength__ parcelid parcelid2 CASE WHEN map IS NOT NULL AND TRIM(map) <> '' AND grid IS NOT N… taxacctnum usecode usedesc zoningcode numunits yearbuilt numfloors bldgsqft imprvalue landvalue totalvalue taxacres saleamt saledate owneraddr CASE WHEN ownadd1 IS NULL AND ownadd2 IS NULL THEN NULL::text W… ownercity ownerstate ownerzip parceladdr parcelcity parcelzip legaldesc NULLIF(concat_ws('; ', legal1::text, legal2::text, legal3::text… section book page block lot updated sourceurl geom taxdistrict extras (json_build_object( 'id', id::text, 'jurscode', jurscode::text,… not present in source — filled with NULL (21) taxyear, zoningdesc, numbldgs, bedrooms, halfbaths, fullbaths, agvalue, ownername, parcelstate, township, qtrsection, range, plssdesc, parentid heatfuel, fireplaces, heating, cooling, foundation, roofcover, siding ZONING 4 mapped · 1 transformed · 6 unmapped (NULL) SOURCE COLUMNS HARMONIZED → ZONING genzone source geom jurscode municipality_name abbreviation updateyr acres genzone_cat shape_starea__ shape_stlength__ globalid created_user created_date last_edited_user last_edited_date zoningcode sourceurl geom extras json_build_object( 'jurscode', jurscode::text, 'municipality_na… not present in source — filled with NULL (6) zoningdesc, zoningtype, ordinance, setbacks, restrictions, notes

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 52,205 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