Key:tiger:CLASSFP
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 tiger:CLASSFP
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| Description |
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FIPS 55 class code - tag of and unclear purpose added by imports from official US sources 
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| Group: import |
| Used on these elements |
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| Status: in use |
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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].