You know, the OP is almost impossible to answer, you would have to contact each and every church (there are hundreds) and ask them when they first made Bible translation statements in their SoF.
I don't know if this counts, but there are hundreds of Baptist churches that identify themselves as King James only.
http://fundamental.org/fundamental/...ncountry&countryname=United States of America
This is just a listing for Baptist churches in the USA, there are also hundreds of Baptist churches listed in many other countries at this site.
Just looking at the list in TN and for KY, there are many that are duplicates. I wonder if those are counted more than once. And I also notice some that actually KJVP. More than one would deny the fundamentals. We've already hashed that. One in KY has closed its doors due to legal/moral issues.
So I wonder how accurate this is. That said, it matters not. Truth isn't decided by numbers.