The link below will download an excel spreadsheet that contains a state by state breakdown by each county (with its FIPS code) identifying which agency submitted the TAZs.

If you have problems loading the link you can try to cut'n paste it into the command line of your browser. If you are still having problems send an email to Nanda Srivivasan and he can email you the file. It is about 450 meg.

https://trbstate.tripod.com/ctpp/tazsummary/tazcounties.xls