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Middlesex County, MA Parcels & GIS Data

Middlesex County, MA parcel data: 525,754 property records with owner names, assessed values, land use, acreage, and addresses. Preview and download.

Land Records publishes Middlesex County, Massachusetts parcel data covering 525,754 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 525,754 parcels in the current dataset. Column coverage is the percentage of those parcels for which the attribute is populated (non-NULL).

ColumnCoverageRecords populated
lrid100%525,754
parcelid100%525,754
parcelid2100%525,753
ogparcelid100%525,754
ogparcelid2100%525,753
parentid93.8%493,024
stackid<0.1%0
geoid100%525,754
statefp100%525,754
countyfp100%525,754
countyname100%525,754
cousubfp100%525,754
cousubname100%525,754
tractce100%525,754
tractname100%525,754
taxacctnum<0.1%0
taxyear99.7%523,993
taxdistrict<0.1%2
usecode99.7%523,996
usedesc<0.1%3
zoningcode86.2%452,979
zoningdesc<0.1%1
numbldgs100%525,754
numunits83.6%439,364
yearbuilt91.2%479,718
numfloors93.9%493,732
bldgsqft94.0%494,141
bedrooms<0.1%0
halfbaths<0.1%1
fullbaths<0.1%1
imprvalue99.7%523,995
landvalue99.7%523,996
agvalue<0.1%1
totalvalue99.7%523,996
taxacres98.8%519,496
calcarea100%525,754
saleamt99.2%521,499
saledate97.5%512,403
ownertype98.3%516,984
ownername98.3%516,984
owneraddr99.0%520,633
ownercity99.0%520,724
ownerstate96.3%506,064
ownerzip98.9%519,830
parceladdr99.7%523,996
parcelcity100%525,754
parcelstate100%525,754
parcelzip100%525,754
legaldesc<0.1%0
township<0.1%0
section<0.1%0
qtrsection<0.1%0
range<0.1%0
plssdesc<0.1%0
book94.1%494,929
page94.5%496,607
block<0.1%2
lot<0.1%2
parceltype2.2%11,819
accesstype2.2%11,819
iucnclass1.5%7,932
placename13.4%70,607
placetype13.2%69,569
firmid100%525,735
firmdate100%525,735
fldzone100%525,735
zonesubty97.3%511,631
staticbfe0.2%1,126
elevmin99.7%524,187
elevmax99.7%524,187
elevavg99.7%524,187
fireplaces<0.1%1
heating<0.1%0
heatfuel<0.1%0
cooling<0.1%0
foundation<0.1%1
roofcover<0.1%0
siding<0.1%1
bldgtype<0.1%1
naicscode<0.1%1
frsid<0.1%0
dfrurl<0.1%0
caapermit<0.1%0
cwapermit<0.1%0
rcrapermit<0.1%0
updated100%525,753
centroidx100%525,754
centroidy100%525,754
surfpointx100%525,754
surfpointy100%525,754
geom100%525,754
extras100%525,754
ownerlist97.9%514,904
placefp66.2%348,311
zoningurl<0.1%0

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 2026-08-15 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 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 100% taxyear 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 97.3% zonesubty 0.2% staticbfe 100% firmdate 100% firmid supplemented · derived / other pipelines 93.8% parentid 86.2% zoningcode 100% numbldgs 83.6% numunits 91.2% yearbuilt 93.9% numfloors 94.0% bldgsqft 100% imprvalue 100% landvalue 100% totalvalue 98.8% taxacres 99.2% saleamt 97.5% saledate 98.3% ownertype 98.3% ownername 99.0% owneraddr 99.0% ownercity 96.3% ownerstate 98.9% ownerzip 100% parceladdr 100% parcelcity 100% parcelstate 100% parcelzip 94.1% book 94.5% page 97.9% ownerlist 66.2% placefp lrid parcelid parcelid2 ogparcelid ogparcelid2 parentid geoid statefp countyfp countyname cousubfp cousubname tractce tractname taxyear usecode zoningcode numbldgs numunits yearbuilt numfloors bldgsqft imprvalue landvalue totalvalue taxacres calcarea saleamt saledate ownertype ownername owneraddr ownercity ownerstate ownerzip parceladdr parcelcity parcelstate parcelzip legaldesc book page firmid firmdate fldzone zonesubty staticbfe elevmin elevmax elevavg updated centroidx centroidy surfpointx surfpointy geom extras ownerlist placefp publish.parcel_layer columns not fed by these sources (36) — empty or below 50% fill in this county stackid, taxacctnum, taxdistrict, usedesc, zoningdesc, bedrooms, halfbaths, fullbaths, agvalue, township, section, qtrsection, range, plssdesc block, lot, parceltype, accesstype, iucnclass, placename, placetype, fireplaces, heating, heatfuel, cooling, foundation, roofcover, siding bldgtype, naicscode, frsid, dfrurl, caapermit, cwapermit, rcrapermit, zoningurl 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:

Frequently asked questions

Where can I find Middlesex County, MA parcel and GIS data?

Land Records publishes a Middlesex County, MA 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 Middlesex County, MA dataset as a GeoPackage or CSV.

How many parcels are in Middlesex County, MA?

The current dataset contains 525,754 parcel records for Middlesex County, MA, each with its boundary geometry and assessor attributes.

What is the FIPS code for Middlesex County, MA?

The FIPS code for Middlesex County, MA is 25017.

What information does each Middlesex County, MA parcel record include?

Each Middlesex County, MA 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 Middlesex County, MA parcel data free?

You can preview Middlesex County, MA 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.

On this page

Attribute coverageSchema mappingNeighboring countiesFAQRelated
Middlesex County, MA Parcels & GIS Data — Property Records & Maps | Land Records