I'm seeing a trend of Seattle artists getting labeled as being from Washington DC. Seattle is in Washington state of course, but there's a big difference...
For example the Tea Cozies are a band from Seattle clearly tagged in wikipedia: http://en.wikipedia.org/wiki/Tea_Cozies and facebook page: https://www.facebook.com/teacozies
This is only coming from one genre and of all ones it could be, "Seattle indie". I'd guess there might be more in other genres.
There are many more examples, all with artist location of: Washington, DC, US