Bloomingdale is part of the DC Office of Planning's Comprehensive Plan's Area Element called Mid-City

The DC Office of Planning’s current effort to amend the DC Comprehensive Plan includes a new map of DC neighborhoods that is NOT based upon ward boundaries. Each cluster of neighborhoods are referred to as “Area Elements.”
        
Bloomingdale and Eckington are part of the Area Element called Mid-City.
   
Here is the link to the Mid-City Area Element map below.

Mid-City Area Element Map From DC OP 2016 10 by Scott Roberts on Scribd