Here are some current figures based on a search on Realtor.com this afternoon. I searched for single family homes and condos for sale at $1,000,000 or more in each city and its nearby areas. I calculated a percentage based on the number for sale at $1,000,000 or more to the total number of single family homes and condos for sale. The cities are ranked from highest percentage to lowest:
Nashville - 380/7,923 - 4.8%
Austin - 409/12,291 - 3.3%
Atlanta - 1,614/52,057 - 3.1%
Charlotte - 517/19,599 - 2.6%
St. Louis - 292/11,289 - 2.6%
Raleigh - 212/10,758 - 2.0%
Birmingham - 137/8,896 - 1.5%
Memphis - 152/13,435 - 1.1%
Louisville - 85/8,867 - 1.0%