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Middlesex County, MA Parcels & GIS Data

Middlesex County, MA parcel data: 426,307 property records with owner names, assessed values, land use, acreage, and addresses. Preview and download.

Land Records publishes Middlesex County, Massachusetts parcel data covering 426,307 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 426,307 parcels in the current dataset. Column coverage is the percentage of those parcels for which the attribute is populated (non-NULL).

ColumnCoverageRecords populated
lrid100%426,307
parcelid93.8%399,972
parcelid2100%426,306
ogparcelid93.8%400,031
ogparcelid2100%426,306
parentid<0.1%0
stackid<0.1%0
geoid100%426,307
statefp100%426,307
countyfp100%426,307
countyname100%426,307
cousubfp100%426,307
cousubname100%426,307
tractce100%426,307
tractname100%426,307
taxacctnum26.0%110,882
taxyear99.1%422,308
taxdistrict3.0%12,982
usecode96.0%409,312
usedesc31.1%132,438
zoningcode87.4%372,649
zoningdesc<0.1%1
numbldgs94.2%401,541
numunits67.2%286,454
yearbuilt90.7%386,521
numfloors63.8%271,821
bldgsqft86.7%369,715
bedrooms6.8%29,158
halfbaths5.6%23,808
fullbaths6.9%29,452
imprvalue90.2%384,522
landvalue94.3%401,829
agvalue1.9%7,957
totalvalue96.5%411,547
taxacres<0.1%1
calcarea100%426,307
saleamt90.3%384,903
saledate97.1%414,118
ownertype99.1%422,293
ownername97.9%417,165
owneraddr96.8%412,612
ownercity96.6%411,813
ownerstate96.2%410,220
ownerzip94.9%404,771
parceladdr100%426,258
parcelcity97.5%415,478
parcelstate100%426,307
parcelzip100%426,307
legaldesc10.3%43,784
township<0.1%0
section<0.1%0
qtrsection<0.1%0
range<0.1%0
plssdesc<0.1%0
book92.4%393,874
page92.5%394,465
block<0.1%2
lot<0.1%2
parceltype2.4%10,121
accesstype2.4%10,121
iucnclass1.6%6,900
placename7.1%30,164
placetype7.0%29,688
firmid100%426,304
firmdate100%426,304
fldzone100%426,304
zonesubty97.2%414,465
staticbfe0.2%936
elevmin99.9%425,920
elevmax99.9%425,920
elevavg99.9%425,920
fireplaces5.0%21,528
heating31.3%133,458
heatfuel30.7%130,990
cooling31.9%135,972
foundation5.0%21,226
roofcover32.7%139,226
siding27.2%115,801
bldgtype<0.1%0
naicscode7.1%30,174
frsid<0.1%0
dfrurl<0.1%0
caapermit<0.1%0
cwapermit<0.1%0
rcrapermit<0.1%0
updated99.1%422,311
centroidx100%426,307
centroidy100%426,307
surfpointx100%426,307
surfpointy100%426,307
geom100%426,307
extras100%426,307
ownerlist34.1%145,285

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 2026-07-25 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 99.1% 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 97.2% zonesubty 0.2% staticbfe 100% firmdate 100% firmid supplemented · derived / other pipelines 87.4% zoningcode 94.2% numbldgs 67.2% numunits 90.7% yearbuilt 63.8% numfloors 86.7% bldgsqft 90.2% imprvalue 94.3% landvalue 96.5% totalvalue 90.3% saleamt 97.1% saledate 99.1% ownertype 97.9% ownername 96.8% owneraddr 96.6% ownercity 96.2% ownerstate 94.9% ownerzip 100% parceladdr 97.5% parcelcity 100% parcelstate 100% parcelzip 92.4% book 92.5% page lrid parcelid parcelid2 ogparcelid ogparcelid2 geoid statefp countyfp countyname cousubfp cousubname tractce tractname taxyear usecode zoningcode numbldgs numunits yearbuilt numfloors bldgsqft imprvalue landvalue totalvalue 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 publish.parcel_layer columns not fed by these sources (38) — empty or below 50% fill in this county parentid, stackid, taxacctnum, taxdistrict, usedesc, zoningdesc, bedrooms, halfbaths, fullbaths, agvalue, taxacres, 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, ownerlist 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 426,307 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