I will wish you luck; I would not want to try to figure that out.
"Now they have 63 church districts in 21 counties. Just since 2000, they've started settlements in Caldwell, Graves, Henry, Mason, Taylor, Breckinridge, Fleming, Lewis, Logan, Nicholas and Ohio counties, he said."
And that is Kentucky- not a state that I have ever really associated with the Amish! It is also only since 2000- I would have thought that the number of settlements would be declining- not thriving... I suppose a possible reason may be found in that article. "the farmer -- a father of 15 children ages 10 to 32..." Another article states that retention in the Amish faith is 80 - 90%!!! I would bet your average Christian church prays for those numbers!
Anyhow, there are two links below that you may find useful (if you could contact the authors or the owners of the websites you may have a lot of luck finding out where they actually reside.)http://www.gwumc.edu/sphhs/departments/pch/phcm/casesjournal/volume3/peer-reviewed/cases_3_04.cfm
Which includes such encouraging gems as "Their choice of separation from public education and technology make it difficult, if not impossible, to reach them through traditional mass communication channels." and "In the United States, approximately 380 Amish settlements are located in approximately half of the 50 states. The Amish reside as far South as Florida and as far West as Montana." I actually believe this is their way of wishing you luck finding all 380 settlements. Heck, even the maps below do not show the Amish in 50 States...
The maps below (that I include only because I found them to be interesting... and because I think the one for Menonites may be depressing
) came from this website dedicated to teaching "low" German. Being as "the old order Amish church" provided the data for the maps you may wish to contact them. It would seem they must keep track of where their churches and settlements are.http://esl.amdsb.ca/low-german-resources/
Anyhow, enjoy your research (on the bright side, it would appear that you can skip Hawaii and Alaska in your research.)