Thanks. I got curious. There are now 210 TV markets (DMA's = Designated Market Areas).
First and last are still the same.
Here's a link to a list if you're interested:
http://www.nielsenmedia.com/DMAs.html
There have been some pretty notable changes. When I worked there, Detroit was number 5 and dropped to 7. Cleveland was in the top 10 (number 8 I think). Miami was much higher, but Houston, Dallas and Atlanta were in the top 15-20. That pretty clearly shows the migration away from the traditional "rust belt."
The top 4 markets have stayed the same for as long as I can remember.
An interesting statistic from years ago, which I doubt is true anymore, is that there were more people in the Philly TV market than the entire Mountain Time Zone. I suspect, with the growth in the West, that has changed. Denver has moved from market 33 when I first visited here to number 18 now.