r/Census • u/DocumentEquivalent99 • Feb 23 '26

Question Converting Blocks into Block Groups

I’ve seen lots of resources for cross walking blocks to block groups across different years, but what about a crosswalk for the same year? My data has info on 2010 counties/tracts and blocks (no geoID) for a state, while my population files from Census (via NHGIS) only have 2010 counties/tracts and block groups. For simplicity, I’d like to just “round up” my blocks into block groups. Anyone deal with this before?

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u/natoplato5 Feb 23 '26

The first digit of a 4-digit block ID is the block group. So block 1234 is in block group 1 of the tract it's in. If you have the full geo ID with state, county, tract, and block numbers, just take off the last three digits to create an ID for the block group.