January 2023

Boundaries of the eight Governor's Council districts for the Commonwealth of Massachusetts, as signed into law on November 22, 2021, with Chapter 92 of the Acts of 2021. These boundaries began to be used with the fall 2022 elections and are based on demographic data from the 2020 U.S. Census.Member names based on the results of the November 2022 election were populated in January 2023.See full metadataMap service also available.

Massachusetts U.S. Congressional Districts, based on 2010 U.S. Census data. Data up-to-date for the 116th Congress in 2019.This service has been superseded by the 118th Congressional Districts.

This map service contains both polygon and linear features for the boundaries of the Massachusetts State House of Representatives districts, which were signed into law on November 4, 2021, with Chapter 83 of the Acts of 2021. These boundaries began to be used with the fall 2022 elections and are based on demographic data from the 2020 U.S. Census.Member names from the results of the November 2022 election were populated in January 2023 and updated in February 2024. An update to the attributes due to a special election in the 6th Worcester District was added in June 2024.Member names from the results of the November 2024 election were populated in January 2025.See full metadataFeature service also available.

January 2025

Application from MassGIS displaying Legislative Districts within the Commonwealth of Massachusetts (Congress and state Senate and House of Representatives). The data displayed in this map include:U.S. Congressional Districts (118th)Massachusetts Senate Legislative Districts (2021) Massachusetts House Legislative Districts (2021)

This layer was created for general use by the Cambridge Election Commission and for public distribution. There are two congressional districts in Cambridge.Explore all our data on the Cambridge GIS Data Dictionary.Attributes NameType DetailsDescription DISTRICT type: Integerwidth: 0precision: 0 District number

NAME type: Stringwidth: 43precision: 0 District Name

CONGRESSPERSON type: Stringwidth: 35precision: 0 Name of current US representative for the district

PARTY type: Stringwidth: 8precision: 0 Party affiliation of current representative

EditDate type: Stringwidth: 4precision: 0

Effective January 2023.More information: Visit the Geographic Information System (GIS) webpage for access to additional City maps.Informing Worcester is the City of Worcester's open data portal where interested parties can obtain public information at no cost.

Massachusetts House Legislative Districts as signed into law on November 3, 2011. These districts were based on demographic data from the 2010 U.S. Census and are used for elections in 2012 and beyond until the districts are redrawn.

Massachusetts Senate Districts (polygons) as signed into law on November 3, 2011. These districts were based on demographic data from the 2010 U.S. Census and are used for elections in 2012 and beyond until the districts are redrawn.

Massachusetts State House of Representatives 2021 District Boundaries (linear features), as signed into law on November 4, 2021, with Chapter 83 of the Acts of 2021. These boundaries will be used beginning with the fall 2022 elections. These districts were based on demographic data from the 2020 U.S. Census.Member names from the results of the November 2022 election were populated in January 2023 and updated in February 2024. An update to the attributes due to a special election in the 6th Worcester District was added in June 2024.Member names from the results of the November 2024 election were populated in January 2025.See full metadataMap service also available.

January 2025

This polygon layer contains the six elective districts for state legislators who represent Cambridge in the Massachusetts House of Representatives. This layer was created for general use by the Cambridge Election Commission and for public distribution. Cambridge wards and precincts can be overlaid on district boundaries to designate which voters fall into each district.

For more information and download links see: http://www.cambridgema.gov/gis/gisdatadictionary/elections/elections_staterepdistricts.aspx

Massachusetts State Senate district boundaries based on 2010 U.S. Census data. These 40 districts were those used in the elections from 2012 and prior to 2022, when they were superseded by the 2021 Senate Districts.

This polygon layer contains the two elective districts for congressmen in Cambridge in the United State Congress. Explore all our data on the Cambridge GIS Data Dictionary.Attributes NameType DetailsDescription DISTRICT type: Stringwidth: 12precision: 0 District number

Congressman type: Stringwidth: 35precision: 0 Name of current US representative for the district

NAME type: Stringwidth: 43precision: 0 District Name

Party type: Stringwidth: 8precision: 0 Party affiliation of current representative

EditDate type: Stringwidth: 4precision: 0 Date of last edit

created_date type: Datewidth: 8precision: 0

last_edited_date type: Datewidth: 8precision: 0

This map service contains both polygon and linear features for the boundaries of the Massachusetts State Senate districts, which were signed into law on November 4, 2021, with Chapter 82 of the Acts of 2021. These boundaries began to be used with the fall 2022 elections and are based on demographic data from the 2020 U.S. Census.Member names with the results of the November 2022 election were entered in January 2023 and updated in February 2024.Member names from the results of the November 2024 election were populated in January 2025.See full metadataMap service also available.

2020 Census data for the city of Boston, Boston neighborhoods, census tracts, block groups, and voting districts. In the 2020 Census, the U.S. Census Bureau divided Boston into 207 census tracts (~4,000 residents) made up of 581 smaller block groups. The Boston Planning and Development Agency uses the 2020 tracts to approximate Boston neighborhoods. The 2020 Census Redistricting data also identify Boston’s voting districts.

For analysis of Boston’s 2020 Census data including graphs and maps by the BPDA Research Division and Office of Digital Cartography and GIS, see 2020 Census Research Publications

For a complete official data dictionary, please go to 2020 Census State Redistricting Data (Public Law 94-171) Summary File, Chapter 6. Data Dictionary. 2020 Census State Redistricting Data (Public Law 94-171) Summary File

2020 Census Tracts In Boston

2020 Census Block Groups In Boston

Boston Neighborhood Boundaries Approximated By 2020 Census Tracts

Boston Voting District Boundaries

This polygon layer contains the three elective districts for state legislators who represent Cambridge in the Massachusetts Senate.Explore all our data on the Cambridge GIS Data Dictionary.Attributes NameType DetailsDescription SENATOR type: Stringwidth: 35precision: 0 Name of current state representative for the district

SENATE type: Stringwidth: 35precision: 0 State Senate District

Party type: Stringwidth: 8precision: 0 Party affiliation of current representative

EditDate type: Stringwidth: 4precision: 0

created_date type: Datewidth: 8precision: 0

last_edited_date type: Datewidth: 8precision: 0

Application for viewing voting districts in the Town of Dedham. Current voting precinct map for Dedham, Massachusetts. The current precinct boundaries were established following the federal census in 2020 and are effective December 31, 2021.

The MTDB represents a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line File is designed to stand alone as an independent data set, or they can be combined to cover the entire nation.Block Groups (BGs) are defined before tabulation block delineation and numbering, but are clusters of blocks within the same census tract that have the same first digit of their 4-digit census block number from the same decennial census. For example, Census 2000 tabulation blocks 3001, 3002, 3003,.., 3999 within Census 2000 tract 1210.02 are also within BG 3 within that census tract. Census 2000 BGs generally contained between 600 and 3,000 people, with an optimum size of 1,500 people. Most BGs were delineated by local participants in the Census Bureau's Participant Statistical Areas Program (PSAP). The Census Bureau delineated BGs only where the PSAP participant declined to delineate BGs or where the Census Bureau could not identify any local PSAP participant.A BG usually covers a contiguous area. Each census tract contains at least one BG, and BGs are uniquely numbered within census tract. Within the standard census geographic hierarchy, BGs never cross county or census tract boundaries, but may cross the boundaries of other geographic entities like county subdivisions, places, urban areas, voting districts, congressional districts, and American Indian / Alaska Native / Native Hawaiian areas. BGs have a valid code range of 0 through 9. BGs coded 0 were intended to only include water area, no land area, and they are generally in territorial seas, coastal water, and Great Lakes water areas. For Census 2000, rather than extending a census tract boundary into the Great Lakes or out to the U.S. nautical three-mile limit, the Census Bureau delineated some census tract boundaries along the shoreline or just offshore. The Census Bureau assigned a default census tract number of 0 and BG of 0 to these offshore, water-only areas not included in regularly numbered census tract areas.Informing Worcester is the City of Worcester's open data portal where interested parties can obtain public information at no cost.