The two major plasma collection companies of which I’m aware are BioLife Plasma Services and CSL Plasma, both of which are national companies, but neither of which appears to have a donation center near DC.
This is actually typical: there is an attempt to avoid most major urban areas with higher than average concentrations of bloodborne diseases. As lower income people are both more likely to want to sit through the 90-ish minute procedure ($20 is $20)* and more likely to have diseases like hepatitis, it makes sense for them to focus on smaller cities with, terrible as it may sound, smaller numbers of minorities.

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valkyryn commenting on Blood-product donation: which is the best type for AB+?

An interesting explanation that explains the distribution of plasma centers that have previously confused me. although.. i think that the explanation for increased prevalence of bloodborne diseases in urban areas is something other than an increased minority population. You know, like increased amounts (in total population if not in rates) of IV drug use.