Sorry, I couldn't help but laugh not at you but at the fact that you think Nashville is so huge. I live in Nashville and used to live in Indiana. I have been to Chicago and New York City. Nashville, to me, is about the size of Indianapolis. It is easy to get around and what you are probably thinking is that the suburban areas and town connecting make it seem a lot larger. In all actuality, Nashville is a small country city. This is nice. However, the traffic is horrific here (I notice someone else mentioned it). I live in Franklin which is 15 minutes South of Nashville.....if it is the middle of the night on a Sunday night. During the week, especially during rush hour (which can last three or four hours), it is a 45 minute to 1.5 hour drive from here to Nashville. And that is whether you are coming in from Ashland City, Dickson, Antioch, Smyrna or Hendersonville.
The traffic is horrible because the economy is better here and a lot of car manufacturer's call this home now. So, people from Michigan, a lot of them, as well as Californian's have moved to the Cool Springs and Nashville area. Seriously, Nashville doesn't even touch Chicago in size. As I said, I lived in Indianapolis most of my life, it took me longer to get from the South side of Indy to the North side than it ever has to get from South Nashville to North Nashville. 25 minutes TOPS if you stay on 65.
When looking at rankings for largest cities, a lot is taken into consideration. In the case of city populations, the resulting distribution in a country, region or the world will be characterized by a largest city, with other cities decreasing in size respective to it, initially at a rapid rate and then more slowly. This results in a few large cities, and a much larger number of cities orders of magnitude smaller. For example, a rank 3 city would have ⅓ the population of a country's largest city, a rank four city would have ¼ the population of the largest city, and so on. (wikepedia-rank-size rule).
Hope this helps :-)