This is the Cat Fanciers' Association's list of the top ten
most popular breeds. Last year, Persian cats were at the top of the list
with more than 23,000 registrations and Maine Coon wasn't far behind...

According to our 2001 registration statistics, the top 10 most popular
breeds are:
Persian
Maine Coon
Exotic
Siamese
Abyssinian
Oriental
American Shorthair
Burmese
Birman
Tonkinese

http://www.cfainc.org/news.html