Here is a link that you will find helpful.

http://www.nashvilleareainfo.com/Default.aspx?page=Demographics

Right. Two schools in Brentwood are ranked on Newsweek's 2007 Top 1300 Public High Schools. Franklin has one school ranked. Generally speaking, many families move to Williamson County with schools in mind. Both Brentwood and Franklin are within Williamson County. Franklin, the county seat, is the largest city within Williamson County and offers the most variety in terms of housing prices. Other cities in the county include Brentwood, Nolensville, Thompson Station, Spring Hill and Fairview. Brentwood is the closest city to Nashville of the Williamson County cities and is probably more affluent overall. In Davidson County, Hillsboro is ranked in Nashville with students from the "area" known as Green Hills in the city of Nashville.

Spring Hill would be a viable option.

Hendersonville, in Sumner County, just northeast of Nashville might not be a bad bet either. This will generally put you 25-40 minutes to downtown Nashville, depending exactly where you settle. Here you can find moderately priced 2,000 sqft homes close to parks, school, all major conveniences, as well as multi-million dollar lakefront homes on Old Hickory Lake. Hope this helps.

That would be Williamson county, just South of Nashville. The cities would be Brentwood, Franklin, Thompson Station, and Spring Hill.