Your block code is a geo code and you need to look at the Tiger mapping files that the census bureau maintains to croos match to shapes
see the link TIGER/Line® - Geography - U.S. Census Bureau
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Thanks for your reply. I'm a little embarrassed about how easy it was to answer my question. Obviously a need a refresher in Tableau mapping basics. I didn't realize how Tableau was set up to be able to assign geographic roles to Census data.
Anyway, you launched me in the direction of a solution. As is often the case, I now see that the issue isn't Tableau, it's about incomplete data.
Thanks for being of service to me and the community.
I have a question - is your data from Illinois? I looked at the data and it ID's the state as PA - that is why I thought you would need to pull the block file from Tiger
I must have mis-interpreted the data