Key:tiger:CLASSFP

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Public-images-osm logo.svg tiger:CLASSFP
Description
FIPS 55 class code - tag of and unclear purpose added by imports from official US sources Show/edit corresponding data item.
Group: import
Used on these elements
should not be used on nodesshould not be used on waysshould not be used on areasshould not be used on relations (except multipolygon relations)
See also
Status: in use

Meaning of that tag is unclear[1] and it is dubious whatever it should be present on any object.

In http://www2.census.gov/geo/pdfs/maps-data/data/tiger/tgrshp2008/TGRSHP08.pdf it is defined as "Current FIPS 55 class code" and restricted to be string of (maximum?) length 2. FIPS 55 class codes seems to be defined at https://geonames.usgs.gov/domestic/fips55codedef.html

In OSM database values tiger:CLASSFP=C1, tiger:CLASSFP=U1, tiger:CLASSFP=C5, tiger:CLASSFP=U2 dominate[2].