Processing Notes:

Data was downloaded from the U.S. Census Bureau FTP site, imported into SAS format and joined to the 2020 TIGER boundaries. Boundaries are sourced from the 2020 TIGER/Line Geodatabases. Boundaries have been projected into Web Mercator and each attribute has been given a clear descriptive alias name. No alterations have been made to the vertices of the data.
Each attribute maintains it's specified name from Census, but also has a descriptive alias name and long description derived from the technical documentation provided by the Census.
For a detailed list of the attributes contained in this layer, view the Data tab and select "Fields".
The following alterations have been made to the tabular data:

Joined all tables to create one wide attribute table:

P1 - Race
P2 - Hispanic or Latino, and not Hispanic or Latino by Race
P3 - Race for the Population 18 Years and Over
P4 - Hispanic or Latino, and not Hispanic or Latino by Race for the Population 18 Years and Over
H1 - Occupancy Status (Housing)
P5 - Group Quarters Population by Group Quarters Type (correctional institutions, juvenile facilities, nursing facilities/skilled nursing, college/university student housing, military quarters, etc.)
Header

After joining, dropped fields: FILEID, STUSAB, CHARITER, CIFSN, LOGRECNO, GEOVAR, GEOCOMP, LSADC, and BLOCK.
GEOCOMP was renamed to GEOID and moved be the first column in the table, the original GEOID was dropped.
Placeholder fields for future legislative districts have been dropped: CD118, CD119, CD120, CD121, SLDU22, SLDU24, SLDU26, SLDU28, SLDL22, SLDL24 SLDL26, SLDL28.
P0020001 was dropped, as it is duplicative of P0010001. Similarly, P0040001 was dropped, as it is duplicative of P0030001.
In addition to calculated fields, County_Name and State_Name were added.
The following calculated fields have been added (see long field descriptions in the Data tab for formulas used):

PCT_P0030001: Percent of Population 18 Years and Over
PCT_P0020002: Percent Hispanic or Latino
PCT_P0020005: Percent White alone, not Hispanic or Latino
PCT_P0020006: Percent Black or African American alone, not Hispanic or Latino
PCT_P0020007: Percent American Indian and Alaska Native alone, not Hispanic or Latino
PCT_P0020008: Percent Asian alone, Not Hispanic or Latino
PCT_P0020009: Percent Native Hawaiian and Other Pacific Islander alone, not Hispanic or Latino
PCT_P0020010: Percent Some Other Race alone, not Hispanic or Latino
PCT_P0020011: Percent Population of Two or More Races, not Hispanic or Latino
PCT_H0010002: Percent of Housing Units that are Occupied
PCT_H0010003: Percent of Housing Units that are Vacant

Please note these percentages might look strange at the individual block group level, since this data has been protected using differential privacy.*

*To protect the privacy and confidentiality of respondents, data has been protected using differential privacy techniques by the U.S. Census Bureau. This means that some individual block groups will have values that are inconsistent or improbable. However, when aggregated up, these issues become minimized. The pop-up on this layer uses Arcade to display aggregated values for the surrounding area rather than values for the block group itself.

Download Census redistricting data in this layer as a file geodatabase.