1990 Census Block Data

Because I was curious, I wrote to Census, and got this reply:

Data from the 1990 census at the block level are available from 1990 Summary Tape File 1B (Tape or CD-ROM). You can contact your local State Data Center (http://www.census.gov/sdc/www/) for assistance or purchase the tape or CD-ROM from our Customer Services Center. Their telephone number is 301-763-4636.

We are in the process of decommissioning the e-mail address . Please submit future request to our "Ask Questions" link at http://www.census.gov. From the center of our web site, select the radio button "FAQs" and then go over to the right and click on the "GO" button. Select "Ask A Question." If you forget your password, please contact the Customer Services Center on 301-763-4636.

Again, we appreciate your interest in our data.

So, no, 1990 block data is NOT available from American Factfinder. 1990 block group data, yes; 2000 block data, yes.