These relationship files provide simple relationships between 2020 tabulation entities and the newly defined Core Based Statistical Areas (CBSAs). The newly defined CBSAs first appeared in products for the 2023 American Community Survey (ACS).

• Geographic Relationships Between Entity Types
  • Core Based Statistical Area (CBSA) Relationship Files

These files show the relationship between different types of geography for the same time period (e.g., the relationships between urban areas and core based statistical areas).