[Talk-us] Correct source for population=* tags on US metropolitan cities

[Michael Patrick]

The US Census also collects legal / admin boundary information from other
entities ( down to things like school districts ).
https://www.census.gov/geographies/reference-maps/2021/geo/bas/2021-bas-maps.html
because federal money flows according to these boundaries.

But reallocation of population counts into these is a non-trivial exercise,
because at the block / tract level they do everything possible to maintain
those from census to census to make time series easier. ( " A century of
census tract use has shown that census tracts continue to be an important
geography for the tabulation of decennial census data and other statistical
programs, and that census tract boundary continuity and the resulting
census tract data comparability over time are of considerable significance
to data users." from
https://www.census.gov/history/www/programs/geography/tracts_and_block_numbering_areas.html
).




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