Most states don't.
Given the limited amount of and high price of land in Pennsylvania, many younger Amish have found Indiana to be, as it were, "Paradise", and have been relocating to farming areas throughout the state for the last 30 years.
You can find them everywhere there these days.
Actually the Amish moving en masse to a community ends up being a financial windfall for that community - they pay their taxes, but run all their schools privately, so you don't have to expand the schools, and they make basically no use of the local social services whatsoever.
I grew up in Ohio around a similar sect as the Amish -- the Dunkard Brethren. They had a horse and buggy church and a car church but one thing they had in common was the latest farm equipment. The horse and buggy church kids used to go on dates on the modern tractor into town. They always referred to themselves as the car church and horse and buggy church and I don't know the real name of either church to this day.
They dressed the same as the Amish so I don't know the difference except they were pacifist and wouldn't lift a firearm to protect their own but would go hunting.