Census 2020 Block Groups
Census geographic areas are used by the Census Bureau to collect, tabulate, and aggregate decennial census data, and are also used in more frequent demographics reports like the annual American Community Survey (ACS). Three levels of areal geography are available from MassGIS (with layer name in parentheses): Blocks, Block Groups, and Tracts
- Records
- 361
- Formats
- 5
- Last updated
- Jun 13, 2025
Download & API
Census 2020 Block Groups (CSV)csv
Spreadsheet — attributes, with coordinates for point layers
Census 2020 Block Groups (GeoJSON)geojson
GeoJSON — for web maps and GIS tools
Census 2020 Block Groups (GeoParquet)geoparquet
Columnar — query with DuckDB / SQL
Census 2020 Block Groups (map tiles)pmtiles
Vector tiles — embed in a map
Live ArcGIS layer (source)arcgis
Rendered from PMTiles, queried in-browser from GeoParquet — no server. How this works
Schema
| Field | Type | Values |
|---|---|---|
State FIPS Code STATEFP20 | string | 1 values: 25 (361) |
County FIPS Code COUNTYFP20 | string | 3 values: 017 (178), 025 (113), 021 (70) |
Tract Code TRACTCE20 | string | |
Block Group Number BLKGRPCE20 | string | 8 values: 1 (114), 2 (104), 3 (79)… |
GEO ID GEOID20 | string | |
Block Group Name NAMELSAD20 | string | 8 values: Block Group 1 (114), Block Group 2 (104), Block Group 3 (79)… |
MAF/TIGER Feature Class Code MTFCC20 | string | 1 values: G5030 (361) |
Land Area in Sq. Meters ALAND20 | number | 27,862 to 7,031,486 |
Water Area in Sq. Meters AWATER20 | number | 0 to 1,203,439 |
Latitude of Internal Pt. INTPTLAT20 | string | |
Longitude of Internal Pt. INTPTLON20 | string | |
Area in Sq. Feet AREA_SQFT | number | 299,885 to 76,664,243 |
Area in Acres AREA_ACRES | number | 7 to 1,760 |
Tract ID TRACT20 | string | |
Housing Units HOUSING20 | integer | 0 to 1,312 |
2020 Population POP20 | integer | 0 to 3,300 |
Number of Blocks BLK20_CNT | integer | 1 to 62 |