They used to be controlled by Nashville until about 5 years ago I think...and then they were transferred to Huntsville. Huntsville opened itself in early 2003 (North AL was previously covered by Birmingham). Simply because those counties are closer to the Huntsville office...and probably are more effectively served by them. Huntsville's a very small office with not many counties of responsibility...so they could have stood to gain a few. Nashville has many more counties to cover.