Vienna is unique because it has two metro stops (Dunn Loring and Vienna), there's the Town of Vienna and there's the rest of it (including Merrifield). In April of 2009, Fairfax Board of Supervisors created a Community Development Authority for the proposed Mosaic-Merrifield development. This Merrifield redevelopment deserves a revisit.
Here's a little bit of history for Vienna, via Wiki.
The town was originally called Ayr Hill, after the name of the house built by early settler John Hunter, who named it after the place of his birth, Ayr, in Scotland. The name of the town was changed in the 1850s, when a doctor named William Hendrick offered to move there if the town would rename itself after his hometown, Vienna, New York.
The three zip codes for Vienna are 22180, 22181 and 22182. Below is comps for the three zips for the month of May.
Zip code: 22180 2009 2008 %
Ave. sales price $520,835 $566,265 -8.02%
Median sales price $450,000 $529,950 -15.09%
Total units sold 23 26 -11.54%
Days on market 134 68
Ave. list price for solds $560,661 $611,798 -8.36%
Zip code: 22181
Ave. sales price $554,367 $603,329 -8.12%
Median sales price $557,500 $572,500 -2.62%
Total units sold 24 24
Days on market 75 58
Ave. list price for solds $587,321 $632,396 -7.31%
Zip code: 22182
Ave. sales price $672,560 $846,776 -20.57%
Median sales price $629,000 $795,000 -20.88%
Days on market 25 17
Ave. list price for solds $716,189 $920,553 -22.2%
Clearly data shows the higher priced market got hit the hardest. That is, zip code 22182. Like any other hoods in the Metro DC area, Vienna is not immune to foreclosures, short-sales - because in some pockets - you can still find distressed homes in the $200's range.