How big would a city need to be to be considered urban? Obviously everybody would agree that Knoxville, Chattanooga, Nashville, Memphis would be urban. What's next? Johnson City, Bristol, Cookeville, Murfreesboro, Dickson, Columbia, Jackson, Dyersburg, Martin? More than that? Less? And would it just be schools inside the city? county? Within 50 miles? I love the idea of splitting rural and urban but how do you qualify the schools?
I don't think enrollment alone divides urban and rural. For example, I think Hardin County would be a rural area but their enrollment currently has then in 4A in football, and they have been 5A for several years.