I was looking at the naming convention for US blockgroups but could not find and reliable documentation for it. US Census website mentioned somewhere that the 5 digit US county code can be split as XXYYY where XX denotes the state code and YYY denotes an the county id within that state. Is there a similar convention for US blockgroups as well? I believe they use the FIPS system but wanted to get some more information on that.
Alternately, is there a source where I can get naming conventions for all these geospatial types?