From whom would I purchase a list of companies in my area that have purchased Microsoft SQL Server?

Question : From whom would I purchase a list of companies in my area that have purchased Microsoft SQL Server?
I would like to do a select post card mailing to companies that use SQL Server. I am a contract employee specializing in assisting users with SQL Server projects and I looking for additional clients in the south-east suburbs of Columbus, OH. I would like to do a post card mailing to find new clients.
microsoft sql server

Best answer:

Answer by shiprepairwoman
Nobody but MSFT would know who they licensed. Try mailing every company or placing an ad in the yellow pages.