MassGIS' standardized assessors’ parcel mapping data set contains property (land lot) boundaries and database information from each community's assessor.The data were developed through a competitive procurement funded by MassGIS. Each community in the Commonwealth was bid on by one or more vendors and the unit of work awarded was a city or town. The specification for this work was Level 3 of the MassGIS Digital Parcel Standard.This map service contains three feature classes and one table.Feature service also available.See the datalayer page for full details.

To access parcel information:Enter an address or zoom in by using the +/- tools or your mouse scroll wheel. Parcels will draw when zoomed in.Click on a parcel to display a popup with information about that parcel.Click the "Basemap" button to display background aerial imagery.From the "Layers" button you can turn map features on and off. Check on 'Download Parcel Data by City/Town' and click in the map for links to download all parcel data for that municipality.Complete Help (PDF)Parcel Legend:Full Map LegendAbout this ViewerThe map displays land property boundaries from assessor parcel maps across Massachusetts. Parcel information is from local assessor databases. More...Read about and download parcel dataAlso available: an accessible, non-map-based Property Information FinderDISCLAIMER: Assessor’s parcel mapping is a representation of property boundaries, not an authoritative source. The authoritative record of property boundaries is recorded at the registries of deeds. A legally authoritative map of property boundaries can only be produced by a professional land surveyor.V 1.4 MassGIS, EOTSS 2021

MassGIS' standardized ("Level 3") property tax parcel mapping data set was developed through a competitive procurement funded by MassGIS. Each community in the Commonwealth was bid on by one or more vendors and the unit of work awarded was a city or town. The specification for this work was Level 3 of the MassGIS Digital Parcel Standard. Standardization of assessor parcel mapping is complete for all 351 Massachusetts' cities and towns. MassGIS is now incorporating updates from municipalities into the database.This hosted feature layer is exported from MassGIS' internal database of the feature class GISDATA.L3_TAXPAR_POLY_ASSESS, which links L3_TAXPAR_POLY and L3_ASSESS. The export includes the expression:(POLY_TYPE IN ('FEE', 'TAX')) OR (POLY_TYPE IN ('ROW', 'PRIV_ROW', 'RAIL_ROW', 'WATER') AND PROP_ID IS NOT NULL)It contains several fields from GISDATA.L3_ASSESS and stacked polygons where multiple assessor records link to a parcel. It contains features that do not have an associated record in GISDATA.L3_ASSESS, except for rights of way and water bodies. ROWs and water bodies with a non-null PROP_ID are included. The data in this feature layer is used for the popups in the Massachusetts Interactive Property Map.See full data descriptionA hosted tile layer will draw very quickly at map scale of 1:18,056 (level 15) to 1:564 (level 20).

The 2016 Massachusetts Small MS4 General Permit requires that Municipal Separate Storm Sewer Systems (MS4s) be mapped. With MS4s interconnected across properties, maps are developed by different organizations which makes it difficult to determine where stormwater runoff is collecting and how stormwater infrastructure is managed. Through interviews and geospatial data analysis, we developed recommendations for facilitating the collaboration and integration of geospatial data between Central Massachusetts Regional Stormwater Coalition communities and the Massachusetts Department of Transportation.

September 2025

Access Massachusetts's 86 data folders with 948 services and 2,776 layers of parcel boundaries, property tax records, and GIS mapping data.

This layer package contains GIS data in Esri file geodatabase format. This data is also available for download as a zip archive in shapefile format.Digital parcel files for the Town of Amherst, MA as of December 31, 2013. The Town converted its existing analog tax maps to digital format in 1998. At the time of conversion, tax maps consisted of 108 27"x39" mylar sheets at 1"=100', originally created in 1957 from controlled and rectified photography taken by Air Survey Inc. (VA) in 1956. The tax maps were scanned, and digital line files were created with text annotation. The new line files were then overlayed onto digital color orthophotos produced in 1999, and updated, by first matching road right-of-ways, then adjusting all parcel boundaries. This data set is a spatial view that is created through a one-to-many join between TOA_Parcels_Poly and TOA_CAMA_TABLE. The join is through Map & Lot, which creates stacked parcel polygons in cases where there are multiple block numbers (accounts) for one parcel; this occurs primarily with condominium complexes, as well as with properties with agricultural preservation restrictions. This data set is refreshed on a nightly basis & reflects current information from the Town of Amherst Assessor's Vision Appraisal Database.

Background and Data Limitations The Massachusetts 1830 map series represents a unique data source that depicts land cover and cultural features during the historical period of widespread land clearing for agricultural. To our knowledge, Massachusetts is the only state in the US where detailed land cover information was comprehensively mapped at such an early date. As a result, these maps provide unusual insight into land cover and cultural patterns in 19th century New England. However, as with any historical data, the limitations and appropriate uses of these data must be recognized: (1) These maps were originally developed by many different surveyors across the state, with varying levels of effort and accuracy. (2) It is apparent that original mapping did not follow consistent surveying or drafting protocols; for instance, no consistent minimum mapping unit was identified or used by different surveyors; as a result, whereas some maps depict only large forest blocks, others also depict small wooded areas, suggesting that numerous smaller woodlands may have gone unmapped in many towns. Surveyors also were apparently not consistent in what they mapped as ‘woodlands’: comparison with independently collected tax valuation data from the same time period indicates substantial lack of consistency among towns in the relative amounts of ‘woodlands’, ‘unimproved’ lands, and ‘unimproveable’ lands that were mapped as ‘woodlands’ on the 1830 maps. In some instances, the lack of consistent mapping protocols resulted in substantially different patterns of forest cover being depicted on maps from adjoining towns that may in fact have had relatively similar forest patterns or in woodlands that ‘end’ at a town boundary. (3) The degree to which these maps represent approximations of ‘primary’ woodlands (i.e., areas that were never cleared for agriculture during the historical period, but were generally logged for wood products) varies considerably from town to town, depending on whether agricultural land clearing peaked prior to, during, or substantially after 1830. (4) Despite our efforts to accurately geo-reference and digitize these maps, a variety of additional sources of error were introduced in converting the mapped information to electronic data files (see detailed methods below). Thus, we urge considerable caution in interpreting these maps. Despite these limitations, the 1830 maps present an incredible wealth of information about land cover patterns and cultural features during the early 19th century, a period that continues to exert strong influence on the natural and cultural landscapes of the region.

    Acknowledgements
    Financial support for this project was provided by the BioMap Project of the Massachusetts Natural Heritage and Endangered Species Program, the National Science Foundation, and the Andrew Mellon Foundation. This project is a contribution of the Harvard Forest Long Term Ecological Research Program.

Town of Otis, MA GIS Viewer

This polygon layer contains all of the property parcels in Cambridge. Each parcel has a unique Map and Lot ID number that links it to a record in the Assessing Department's Vision database system. Created for internal use by the Assessing Department to provide a visual reference associated with each parcel in the CAMA database. Created for interdepartmental and external use as part of the web viewers on the City's website. Also created for addressing/geocoding needs, although the Buildings and Master Address List are currently more accurate than Parcels. NOTE: The Parcels GIS data layer is NOT used by Assessing to calculate land area or taxes. Assessors refer to actual deeds or plans accepted by the Massachusetts Land Court. The figures stored in the GIS data layer are for general reference purposes only.

For more information and download links see: https://www.cambridgema.gov/GIS/gisdatadictionary/Assessing

This dataset consists of tax parcels for Easton, Massachusetts. Tax parcels represent property boundaries for the purpose of tax assessment. Tax parcels are not an authoritative source of property boundaries. The authoritative record of property boundaries are recorded at the Bristol County Registry of Deeds. Only a professional land surveyor my produce a legally authoritative map of property boundaries.Assessor property values are for fiscal year 2026. Tax parcels include recorded plans and deeds through June 2025.Ownership information is updated the first Friday each month and may not reflect current ownership.This feature class contains redundant geometry in cases where there are multiple condominium units on a given tax parcel.

Polygonal extents of federal (US Army Corps of Engineers) dredge projects along the Massachusetts marine coastline; historical to 16 December 1998; includes navigational channels, anchorages, harbors, beaches and dikes. Feature attributes include hyperlinks to respective USACE project descriptions, histories, and maps.

This map service contains the Property Tax Parcel Mapping from MassGIS. The data are cached and stored as a tiled map service (levels 15-20) at ArcGIS Online for fast display.This tile cache was last updated on July 29, 2025.MassGIS' standardized "Level 3" assessors’ parcel mapping data set contains property (land lot) boundaries and database information from each community's assessor.The data were developed through a competitive procurement funded by MassGIS. Each community in the Commonwealth was bid on by one or more vendors and the unit of work awarded was a city or town. The specification for this work was Level 3 of the MassGIS Digital Parcel Standard. Standardized data are available for all of Massachusetts' 351 cities and towns.MassGIS is continuing the project, updating parcel data provided by municipalities. See the L3 Parcel Fiscal Year Status Map.To query the parcels, use the hosted feature layer.

Town of Barnstable, MA GIS Maps - various PDFs

This map shows tax parcels of interest within the context of the Intermunicipal Shoreline Management project, in the towns of Provincetown, Truro, Wellfleet and Eastham, MA. Tax parcels were developed from existing digital data that is maintained on MassGIS (see MassGIS Data: Standardized Assessors" Parcels). Geometry and attribute data was compiled for the planning area (parcels intersecting the project extent) in October of 2020 and updated in 2025. This dataset is appropriate for planning purposes only, field survey required. Last Updated 06/2025.

Amherst, MA Property Lines.Metadata is available at http://gis.amherstma.gov/data/metadata/parcels.htm

This polygon layer complies with L3 of the MassGIS Digital Parcel Standard. Parcel editing is completed as needed based on information from the City of Worcester Assessor.More information: Visit the MassGIS Digital Parcel Standard to learn more.Informing Worcester is the City of Worcester's open data portal where interested parties can obtain public information at no cost.

The NOAA Coastal Change Analysis Program (C-CAP) produces national standardized land cover and change products for the coastal regions of the U.S. C-CAP products inventory coastal intertidal areas, wetlands, and adjacent uplands with the goal of monitoring changes in these habitats. The timeframe for this metadata is summer 2016. These maps are developed utilizing high resolution National Agric...

NEW MAP: https://data.cambridgema.gov/Assessing/Cambridge-Parcel-Data-Map/nz6r-3fde

This dataset is OBSOLETE as of 10/24/2024 and will be removed from the Open Data Portal on 10/24/2025

An updated version of this dataset is available at https://data.cambridgema.gov/Assessing/Cambridge-Parcel-Data/c392-hjk3/about_data

This polygon layer contains all of the property parcels in Cambridge. Each parcel has a unique Map and Lot ID number that links it to a record in the Assessing Department's Vision database system. Created for internal use by the Assessing Department to provide a visual reference associated with each parcel in the CAMA database. Created for interdepartmental and external use as part of the web viewers on the City's website. Also created for addressing/geocoding needs, although the Buildings and Master Address List are currently more accurate than Parcels. NOTE: The Parcels GIS data layer is NOT used by Assessing to calculate land area or taxes. Assessors refer to actual deeds or plans accepted by the Massachusetts Land Court. The figures stored in the GIS data layer are for general reference purposes only.

For more information and download links see: https://www.cambridgema.gov/GIS/gisdatadictionary/Assessing

City of North Adams, MA GIS Viewer