30 years ago you could already buy almost all of this + estimated income and education on 90% of americans. It's how credit card companies know who to send mail to.
20 years ago my first roommate worked for a company that did direct mail marketing, and they regularly engaged a "cleaning" firm that would scrub and update their mailing lists.
This company had a huge databases of information on people (name/work/address/DOB/income/etc) and they would send them data and they would clean it up.
Now they would not give them any new data, they could only update records they already owned.
Back then in Canada there were apparently only a small handful of well-known cleaners like this who traded on their reputation for accuracy and dataset completeness..
