Thanks for giving me the go-ahead on this.
You can search the FAA database for aircraft registries at this link:
Aircraft Registration Inquiry
I selected the "Make/Model" search option, and in the text boxes labeled:
"Enter Manufacturer and/or Model Name"
I entered ONLY the manufacuter's name, and left the "Model" field
blank. This sort of search will return a large list of all models
made by a specific manufacturer, along with details on the numbers of
registrations in each state, as well as a national total.
Unfortunately, there is no way to easily download or rank the results
by number of registrations. So, in order to create a list, I used the
Ctrl-F search function on each page of results to search for the word
"Total". This would take me quickly to the totals for each model
number, and of any model where the total was 1,500 or more, I copied
that to my master list.
The results of this (somewhat tedious, but fairly efficient) process
was the following 25 aircraft, all manufactured by either Cessna or
TOTAL - 6130
TOTAL - 4634
TOTAL - 4512
TOTAL - 4333
TOTAL - 4252
TOTAL - 4037
TOTAL - 2582
TOTAL - 2549
TOTAL - 2522
TOTAL - 2482
TOTAL - 2465
TOTAL - 2443
TOTAL - 2365
TOTAL - 2276
TOTAL - 2214
TOTAL - 2096
TOTAL - 1828
TOTAL - 1814
TOTAL - 1718
TOTAL - 1697
TOTAL - 1686
TOTAL - 1655
TOTAL - 1602
TOTAL - 1600
TOTAL - 1571
I trust this list fully meets your needs.
However, before rating this answer, please let me know if there's
anything else I can do for you. Just post a Request for
Clarification, and I'm at your service.
All the best,
search strategy -- Used bookmarked sites for the FAA