From the contact form:
Hello, I am the sales/marketing director at HKM Direct Market Communications in Cleveland, Ohio, and one of the surviving commercial printers in our area. We are celebrating our 100th anniversary this year and will be doing parties and a media campaign. I have been digging but no luck trying to find out how many printers were in Cleveland by the decade beginning in 1950 until today. Also would like to have the same stats for the US. Can you help us?