Just a reminder: fastest growing counties are a poor approximation of counties seeing the most growth because tons of them are small, formerly-rural counties that start to get some exurbs creeping in so they grow 30 or 40 percent in 10 years--from 20,000 to 28,000. Consider Maricopa and Pinal Counties. Which is growing faster? Which is actually seeing more growth?
That's certainly true.
Two of the 100 for example are Gaines and Andrews in the Texas Panhandle, both of which may be described as Odessa exurbs (?) and have fewer than 25,000 inhabitants. Similarly, Williams and Stark in western North Dakota, which are slightly larger but not by much. Coincidentally they are all counties propelled by the oil boom.