REFERENCE

Crosswalks

• 2010–2020 geography: block and tract relationships

  The Census Bureau provides block relationship files for comparing 2010 and 2020 tabulation blocks. It also publishes tract relationship files connecting the two census vintages. These are separate …

• Census GEO.ID prefixes versus county GEOIDs

  A downloaded Census table can use a longer geographic identifier than the corresponding TIGER/Line geography file. Matching the entire strings without checking their structures can therefore fail. The …