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Middlesex County, MA Parcels & GIS Data

Middlesex County, MA parcel data: 426,407 property records with owner names, assessed values, land use, acreage, and addresses. Preview and download.

Land Records publishes Middlesex County, Massachusetts parcel data covering 426,407 property records.

This page documents parcel-level coverage for Middlesex County, Massachusetts. 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 Middlesex County are listed in the attribute-coverage table below. Preview the data in the interactive explorer, or download the complete Middlesex County property dataset.

Middlesex County is a county located in the Commonwealth of Massachusetts, United States, one of fourteen in the state. As of the 2020 census, the population was 1,632,002, making it the most populous county in both Massachusetts and New England and the 20th most populous county in the United States. This makes the county the most populous county on the East Coast outside of New York or Florida. Middlesex County is one of two U.S.

FIPS 25017

The FIPS code for Middlesex County is 25017.

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Attribute coverage

Middlesex County contains 426,407 parcels in the current dataset. Column coverage is the percentage of those parcels for which the attribute is populated (non-NULL).

ColumnCoverageRecords populated
lrid100%426,407
parcelid93.8%400,068
parcelid2100%426,406
ogparcelid93.8%400,127
ogparcelid2100%426,406
parentid<0.1%0
stackid<0.1%0
geoid100%426,407
statefp100%426,407
countyfp100%426,407
countyname100%426,407
cousubfp100%426,407
cousubname100%426,407
tractce100%426,407
tractname100%426,407
taxacctnum26.0%110,882
taxyear34.1%145,300
taxdistrict3.0%12,982
usecode31.0%132,321
usedesc31.0%132,321
zoningcode27.4%116,986
zoningdesc<0.1%1
numbldgs94.1%401,406
numunits30.7%131,076
yearbuilt32.7%139,255
numfloors5.3%22,787
bldgsqft34.1%145,301
bedrooms5.5%23,390
halfbaths5.5%23,609
fullbaths5.6%23,678
imprvalue32.9%140,221
landvalue32.0%136,477
agvalue1.9%7,947
totalvalue32.3%137,817
taxacres<0.1%1
calcarea100%426,407
saleamt32.3%137,851
saledate33.8%144,287
ownertype34.1%145,301
ownername34.1%145,301
owneraddr32.0%136,659
ownercity31.9%135,824
ownerstate31.9%135,824
ownerzip31.9%135,824
parceladdr99.8%425,713
parcelcity91.5%390,035
parcelstate100%426,407
parcelzip100%426,407
legaldesc10.3%43,795
township<0.1%0
section<0.1%0
qtrsection<0.1%0
range<0.1%0
plssdesc<0.1%0
book33.4%142,381
page33.5%142,916
block<0.1%2
lot<0.1%2
parceltype2.4%10,132
accesstype2.4%10,132
iucnclass1.6%6,906
placename7.1%30,182
placetype7.0%29,706
firmid100%426,404
firmdate100%426,404
fldzone100%426,404
zonesubty97.2%414,561
staticbfe0.2%939
elevmin99.9%426,018
elevmax99.9%426,018
elevavg99.9%426,018
fireplaces5.0%21,241
heating31.3%133,321
heatfuel30.7%130,853
cooling31.9%135,835
foundation5.0%21,226
roofcover32.6%139,109
siding27.1%115,547
bldgtype<0.1%0
naicscode7.1%30,182
frsid<0.1%0
dfrurl<0.1%0
caapermit<0.1%0
cwapermit<0.1%0
rcrapermit<0.1%0
updated34.1%145,302
centroidx100%426,407
centroidy100%426,407
surfpointx100%426,407
surfpointy100%426,407
geom100%426,407
extras100%426,407
lrversion100%426,407

Schema mapping

How source columns from the acquired Middlesex 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 — Middlesex County, Massachusetts (25017) 1 entity · most recent acquisition per entity · generated 2026-07-13 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 map_par_id loc_id lu_codes plan_id last_edit geom 11 cols ⇢ parcelid parcelid2 usecode legaldesc updated geom extras determined · ground truth 100% lrid 100% geoid 100% statefp 100% countyfp 100% countyname 100% cousubfp 100% cousubname 100% tractce 100% tractname 34.1% updated 100% lrversion geom · derived from geometry geom dem.us_1m · USGS 1m DEM 100% elevmin 100% elevmax 100% elevavg s_fld_haz_ar · FEMA NFHL 100% fldzone 97.2% zonesubty 0.2% staticbfe 100% firmdate 100% firmid supplemented · derived / other pipelines 94.1% numbldgs 100% parceladdr 91.5% parcelcity 100% parcelstate 100% parcelzip lrid parcelid parcelid2 ogparcelid ogparcelid2 geoid statefp countyfp countyname cousubfp cousubname tractce tractname usecode numbldgs calcarea parceladdr parcelcity parcelstate parcelzip legaldesc firmid firmdate fldzone zonesubty staticbfe elevmin elevmax elevavg updated centroidx centroidy surfpointx surfpointy geom extras lrversion publish.parcel_layer columns not fed by these sources (56) — empty or below 50% fill in this county parentid, stackid, taxacctnum, taxyear, taxdistrict, usedesc, zoningcode, zoningdesc, numunits, yearbuilt, numfloors, bldgsqft, bedrooms halfbaths, fullbaths, imprvalue, landvalue, agvalue, totalvalue, taxacres, saleamt, saledate, ownertype, ownername, owneraddr, ownercity ownerstate, ownerzip, township, section, qtrsection, range, plssdesc, book, page, block, lot, parceltype, accesstype, iucnclass, placename placetype, fireplaces, heating, heatfuel, cooling, foundation, roofcover, siding, bldgtype, naicscode, frsid, dfrurl, caapermit, cwapermit rcrapermit PARCEL 6 mapped · 11 kept in extras · 48 unmapped (NULL) SOURCE COLUMNS HARMONIZED → PARCEL map_par_id loc_id lu_codes plan_id last_edit geom parcelid parcelid2 usecode legaldesc updated geom extras · 11 source columns preserved as json poly_type, map_no, source, bnd_chk, no_match, town_id, site esn, dev, sym1, sym2 extras not present in source — filled with NULL (48) taxacctnum, taxyear, usedesc, zoningcode, zoningdesc, numbldgs, numunits, yearbuilt, numfloors, bldgsqft, bedrooms, halfbaths, fullbaths imprvalue, landvalue, agvalue, totalvalue, taxacres, saleamt, saledate, ownername, owneraddr, ownercity, ownerstate, ownerzip, parceladdr parcelcity, parcelstate, parcelzip, township, section, qtrsection, range, plssdesc, book, page, block, lot, sourceurl, taxdistrict, parentid fireplaces, heating, cooling, foundation, roofcover, siding, heatfuel

Neighboring counties

Parcel data for counties bordering Middlesex County:

On this page

Attribute coverageSchema mappingNeighboring countiesRelated