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Middlesex County, MA Parcels & GIS Data

Middlesex County, MA parcel data: 516,702 property records with owner names, assessed values, land use, acreage, and addresses. Preview and download.

Land Records publishes Middlesex County, Massachusetts parcel data covering 516,702 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 516,702 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%516,702
parcelid99.9%516,354
parcelid299.7%515,179
ogparcelid99.9%516,391
ogparcelid299.7%515,240
parentid65.8%340,078
stackid<0.1%0
geoid100%516,702
statefp100%516,702
countyfp100%516,702
countyname100%516,702
cousubfp100%516,702
cousubname100%516,702
tractce100%516,702
tractname100%516,702
taxacctnum6.1%31,473
taxyear100%516,702
taxdistrict<0.1%0
usecode95.8%495,217
usedesc92.2%476,475
zoningcode99.8%515,599
zoningdesc85.8%443,179
numbldgs100%516,702
numunits93.8%484,614
yearbuilt89.7%463,577
numfloors90.9%469,574
bldgsqft95.8%495,048
bedrooms1.2%6,310
halfbaths1.2%6,310
fullbaths1.2%6,310
imprvalue94.9%490,518
landvalue94.7%489,508
agvalue1.7%8,918
totalvalue94.7%489,509
taxacres94.3%487,071
calcarea100%516,702
saleamt95.4%492,870
saledate94.0%485,461
ownertype94.5%488,539
ownername94.7%489,361
owneraddr94.2%486,734
ownercity94.3%487,050
ownerstate91.6%473,161
ownerzip94.1%486,138
parceladdr99.4%513,575
parcelcity99.9%516,145
parcelstate100%516,702
parcelzip100%516,702
legaldesc1.3%6,536
township<0.1%0
section<0.1%0
qtrsection<0.1%0
range<0.1%0
plssdesc<0.1%0
book90.5%467,412
page90.7%468,417
block0.5%2,765
lot10.2%52,565
parceltype1.3%6,838
accesstype2.3%11,716
iucnclass1.5%7,755
placename3.9%19,908
placetype3.8%19,487
firmid100%516,673
firmdate100%516,673
fldzone100%516,673
zonesubty97.3%502,794
staticbfe0.2%1,245
elevmin99.9%516,052
elevmax99.9%516,052
elevavg99.9%516,052
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%73,287
frsid<0.1%0
dfrurl<0.1%0
caapermit<0.1%0
cwapermit<0.1%0
rcrapermit<0.1%0
updated100%516,702
centroidx100%516,702
centroidy100%516,702
surfpointx100%516,702
surfpointy100%516,702
geom100%516,702
extras100%516,702
ownerlist71.9%371,303
placefp66.5%343,507
zoningurl70.0%361,449
lbcsactivity98.7%510,202
lbcsfunction98.0%506,153
lbcstype97.5%503,862
lbcscharacter99.5%514,206
lbcsownership94.7%489,304
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 2026-10-17 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 parcel_num map_par_id plan_id last_edit geom 9 cols ⇢ parcelid parcelid2 legaldesc updated geom extras REFTABLE first_prop_id loc_id first_use_code sum_lot_size last_use_code geom frequency parcelid parcelid2 usecode taxacres landusecode geom extras ZONING zoning restriction_type comment geom osrp_table osrp_2025_status town_feedback level_of_protection protection_type map_category site_name landowner current_use recreation_potential condition public_access grant_ westford_os_id address map_par_id lot_size site_label osrp_gis_notes category_18_tab street_location site_name_2025_list acres zoning_1 use_ public_access_1 level_of_protection_1 grant_1 ownership chapter_61_list osrp_2018_map_category mpl department updated_1 name1 name2 osrp_inventory_category town_id site_addr addr_num full_str owner1 use_code use_desc use_code_std category_class bldg_val fy ls_date ls_price ls_book ls_page trail_intersects parcel_id plan_id loc_id prop_id cama_id massgis_note11205 poly_id site_name_1 fee_owner owner_abrv owner_type prim_purp pub_access lev_prot oli_1_org oli_1_abrv grantprog1 granttype1 grantprog2 granttype2 eoeainvolve article97 feesym intsym os_id formal_site_name active_passive zoningcode restrictions notes 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 65.8% parentid 92.2% usedesc 85.8% zoningdesc 100% numbldgs 93.8% numunits 89.7% yearbuilt 90.9% numfloors 95.8% bldgsqft 94.9% imprvalue 94.7% landvalue 94.7% totalvalue 95.4% saleamt 94.0% saledate 94.5% ownertype 94.7% ownername 94.2% owneraddr 94.3% ownercity 91.6% ownerstate 94.1% ownerzip 99.4% parceladdr 100% parcelcity 100% parcelstate 100% parcelzip 90.5% book 90.7% page 71.9% ownerlist 66.5% placefp 70.0% zoningurl 98.7% lbcsactivity 98.0% lbcsfunction 97.5% lbcstype 100% lbcscharacter 94.7% 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 5 mapped · 9 kept in extras · 49 unmapped (NULL) SOURCE COLUMNS HARMONIZED → PARCEL parcel_num map_par_id plan_id last_edit geom parcelid parcelid2 legaldesc updated geom extras · 9 source columns preserved as json loc_id, poly_type, map_no, source, bnd_chk, no_match, town_id full_num, type extras 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 7 mapped · 1 transformed · 115 unmapped (NULL) SOURCE COLUMNS HARMONIZED → REFTABLE first_prop_id loc_id first_use_code sum_lot_size last_use_code geom frequency parcelid parcelid2 usecode taxacres landusecode geom extras json_build_object('frequency', frequency::text)::text not present in source — filled with NULL (115) taxacctnum, taxyear, usedesc, zoningcode, zoningdesc, numbldgs, numunits, yearbuilt, bldgsqft, bedrooms, halfbaths, fullbaths, imprvalue landvalue, agvalue, totalvalue, saleamt, saledate, ownername, owneraddr, ownercity, ownerstate, ownerzip, parceladdr, parcelcity, parcelstate parcelzip, legaldesc, township, section, qtrsection, range, plssdesc, book, page, block, lot, zoningtype, zoningordinance, zoningsetbacks zoningrestrictions, landusedesc, lbcsdimension, lbcscode, house, category, near, house_number, road, unit, level, staircase, entrance, po_box postcode, suburb, city_district, city, island, state_district, state, country_region, country, world_region, bldgtype, numfloors, yearremodel livingarea, bldgquality, bldgcondition, architecture, totalrooms, 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 5 mapped · 1 transformed · 5 unmapped (NULL) SOURCE COLUMNS HARMONIZED → ZONING zoning restriction_type comment geom osrp_table osrp_2025_status town_feedback level_of_protection protection_type map_category site_name landowner current_use recreation_potential condition public_access grant_ westford_os_id address map_par_id lot_size site_label osrp_gis_notes category_18_tab street_location site_name_2025_list acres zoning_1 use_ public_access_1 level_of_protection_1 grant_1 ownership chapter_61_list osrp_2018_map_category mpl department updated_1 name1 name2 osrp_inventory_category town_id site_addr addr_num full_str owner1 use_code use_desc use_code_std category_class bldg_val fy ls_date ls_price ls_book ls_page trail_intersects parcel_id plan_id loc_id prop_id cama_id massgis_note11205 poly_id site_name_1 fee_owner owner_abrv owner_type prim_purp pub_access lev_prot oli_1_org oli_1_abrv grantprog1 granttype1 grantprog2 granttype2 eoeainvolve article97 feesym intsym os_id formal_site_name active_passive zoningcode restrictions notes geom extras ( json_build_object( 'osrp_table', "osrp_table"::text, 'osrp_20… not present in source — filled with NULL (5) zoningdesc, zoningtype, ordinance, setbacks, 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 516,702 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