Council Bluffs

Image via Google Maps:

Estimated server count: 241,280

This data center was announced by Google in early 2007 and became operational in early 2009. It looks the same size as The Dalles but housed in a single building instead of two. I am guessing the building is densely packed with containers - leaving space in the middle for cooling machinery.

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Council Bluffs

Google's own page about this data center: