Yes, Ashburn is running out of space, so the data center industry is spreading into western Fairfax and northern Prince William Counties (neighboring areas, and PWC particular has lots of infill space available).

That's a link to Ashburn on Google Maps. Every large commercial building in the cluster north of Dulles Airport is a data center (slightly hyperbolic, but drive through and it's a pretty dystopian sight - just one giant windowless concrete box after another). https://www.google.com/maps/@39.0066627,-77.463925,6993m/dat...