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Middlesex County, MA Parcels & GIS Data

Middlesex County, MA parcel data: 515,968 property records with owner names, assessed values, land use, acreage, and addresses. Preview and download.

Land Records publishes Middlesex County, Massachusetts parcel data covering 515,968 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

Official county website: https://www.arcgis.com/sharing/rest/search?q=MassGIS%20Standardized%20Assessors%20Parcels%20Level%203&f=json

The FIPS code for Middlesex County is 25017.

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Attribute coverage

Middlesex County contains 515,968 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%515,968
parcelid99.9%515,620
parcelid299.7%514,477
ogparcelid99.9%515,657
ogparcelid299.7%514,538
parentid65.9%340,151
stackid<0.1%0
geoid100%515,968
statefp100%515,968
countyfp100%515,968
countyname100%515,968
cousubfp100%515,968
cousubname100%515,968
tractce100%515,968
tractname100%515,968
taxacctnum6.1%31,473
taxyear100%515,968
taxdistrict<0.1%0
usecode95.8%494,551
usedesc92.3%476,457
zoningcode99.8%514,866
zoningdesc85.9%443,311
numbldgs100%515,968
numunits93.8%484,082
yearbuilt89.7%463,017
numfloors90.9%468,821
bldgsqft95.8%494,382
bedrooms1.2%6,310
halfbaths1.2%6,310
fullbaths1.2%6,310
imprvalue94.9%489,854
landvalue94.7%488,843
agvalue8.4%43,373
totalvalue94.7%488,843
taxacres94.3%486,405
calcarea100%515,968
saleamt95.4%492,215
saledate94.0%484,806
ownertype94.7%488,638
ownername94.7%488,695
owneraddr94.2%486,005
ownercity94.3%486,306
ownerstate91.6%472,408
ownerzip94.1%485,452
parceladdr95.9%494,701
parcelcity94.9%489,841
parcelstate100%515,968
parcelzip100%515,968
legaldesc1.3%6,502
township<0.1%0
section<0.1%0
qtrsection<0.1%0
range<0.1%0
plssdesc<0.1%0
book90.5%466,786
page90.7%467,780
block0.5%2,765
lot10.2%52,565
parceltype1.3%6,807
accesstype2.3%11,684
iucnclass1.5%7,737
placename3.8%19,830
placetype3.8%19,412
firmid100%515,939
firmdate100%515,939
fldzone100%515,939
zonesubty97.3%502,058
staticbfe0.2%1,246
elevmin99.9%515,318
elevmax99.9%515,318
elevavg99.9%515,318
fireplaces1.2%6,310
heating1.2%6,029
heatfuel1.2%6,029
cooling1.2%6,029
foundation<0.1%0
roofcover1.2%6,029
siding1.2%6,028
bldgtype<0.1%0
naicscode14.2%73,295
frsid<0.1%0
dfrurl<0.1%0
caapermit<0.1%0
cwapermit<0.1%0
rcrapermit<0.1%0
updated100%515,968
centroidx100%515,968
centroidy100%515,968
surfpointx100%515,968
surfpointy100%515,968
geom100%515,968
extras100%515,968
ownerlist71.8%370,583
placefp66.4%342,728
zoningurl69.8%360,299
lbcsactivity98.9%510,102
lbcsfunction98.1%506,405
lbcstype97.6%503,347
lbcscharacter99.5%513,637
lbcsownership94.8%489,374
sourceurl4.2%21,479

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) 3 entities · most recent acquisition per entity · generated 2026-10-10 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_num full_num plan_id last_edit geom map_par_id loc_id poly_type map_no source bnd_chk no_match town_id type parcelid parcelid2 legaldesc updated geom extras REFTABLE prop_id loc_id fy use_code zoning units year_built bld_area bldg_val land_val total_val lot_size ls_price ls_date owner1 own_addr own_city own_state own_zip site_addr city zip ls_book ls_page addr_num full_str own_co stories res_area style num_rooms geom 6 cols ⇢ parcelid parcelid2 taxyear usecode zoningcode numunits yearbuilt bldgsqft imprvalue landvalue totalvalue taxacres saleamt saledate ownername owneraddr ownercity ownerstate ownerzip parceladdr parcelcity parcelzip book page house_number road country numfloors livingarea architecture totalrooms geom extras ZONING district geom zoningcode geom extras determined · ground truth 100% lrid 100% geoid 100% statefp 100% countyfp 100% countyname 100% cousubfp 100% cousubname 100% tractce 100% tractname 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 65.9% parentid 92.3% usedesc 85.9% zoningdesc 100% numbldgs 100% parcelstate 71.8% ownerlist 66.4% placefp 69.8% zoningurl 98.9% lbcsactivity 98.1% lbcsfunction 97.6% lbcstype 100% lbcscharacter 94.8% lbcsownership lrid parcelid parcelid2 ogparcelid ogparcelid2 parentid geoid statefp countyfp countyname cousubfp cousubname tractce tractname taxyear usecode usedesc zoningcode zoningdesc 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 zoningurl lbcsactivity lbcsfunction lbcstype lbcscharacter lbcsownership publish.parcel_layer columns not fed by these sources (34) — empty or below 50% fill in this county stackid, taxacctnum, taxdistrict, 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, sourceurl PARCEL 6 mapped · 1 transformed · 49 unmapped (NULL) SOURCE COLUMNS HARMONIZED → PARCEL parcel_num full_num plan_id last_edit geom map_par_id loc_id poly_type map_no source bnd_chk no_match town_id type parcelid parcelid2 legaldesc updated geom extras json_build_object( 'map_par_id', map_par_id::text, 'loc_id', lo… not present in source — filled with NULL (49) taxacctnum, taxyear, usecode, 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, heatfuel, fireplaces, heating, cooling, foundation, roofcover, siding REFTABLE 32 mapped · 6 kept in extras · 89 unmapped (NULL) SOURCE COLUMNS HARMONIZED → REFTABLE prop_id loc_id fy use_code zoning units year_built bld_area bldg_val land_val total_val lot_size ls_price ls_date owner1 own_addr own_city own_state own_zip site_addr city zip ls_book ls_page addr_num full_str own_co stories res_area style num_rooms geom parcelid parcelid2 taxyear usecode zoningcode numunits yearbuilt bldgsqft imprvalue landvalue totalvalue taxacres saleamt saledate ownername owneraddr ownercity ownerstate ownerzip parceladdr parcelcity parcelzip book page house_number road country numfloors livingarea architecture totalrooms geom extras · 6 source columns preserved as json other_val, location, reg_id, lot_units, town_id, cama_id extras not present in source — filled with NULL (89) taxacctnum, usedesc, zoningdesc, numbldgs, bedrooms, halfbaths, fullbaths, agvalue, parcelstate, legaldesc, township, section, qtrsection range, plssdesc, block, lot, zoningtype, zoningordinance, zoningsetbacks, zoningrestrictions, landusecode, landusedesc, lbcsdimension, lbcscode house, category, near, unit, level, staircase, entrance, po_box, postcode, suburb, city_district, city, island, state_district, state country_region, world_region, bldgtype, yearremodel, bldgquality, bldgcondition, fireplaces, heating, cooling, foundation, attic, atticsqft intwall, extwall, roofstyle, roofcover, roofheight, fsagpfeet, siding, framing, basementsqft, attgaragesqft, detgaragesqft, garagestalls situsaddress, appraisedvalue, assessedvalue, boatlift, boatdock, boathouse, pool, gazebo, irrigation, riprap, solarium, carport, greenhouse openporch, enclporch, sauna, wooddeck, hottub, patio, shed, workshop, sourceurl, taxdistrict, parentid, heatfuel ZONING 3 mapped · 2 transformed · 7 unmapped (NULL) SOURCE COLUMNS HARMONIZED → ZONING district geom zoningcode COALESCE(TRIM(district)::text, '') geom extras json_build_object() not present in source — filled with NULL (7) zoningdesc, zoningtype, ordinance, setbacks, restrictions, notes, sourceurl

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 515,968 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.

Does Middlesex County, MA have an official GIS or property records website?

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

On this page

Attribute coverageSchema mappingNeighboring countiesFAQRelated