Key:tiger:CPI

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Public-images-osm logo.svg tiger:CPI
Description
tag of unknown meaning 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)
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 urban area central place indicator" and restricted to be string of length 1.

In OSM database values tiger:CPI=Y and tiger:CPI=N clearly dominate[2] what suggests that it may be boolean value. Though it is not clear whatever yes/no applies to "Current" part, "urban" part or some other segment of definition.