OT: Slightly OT: Language Census Info

This is slightly off topic, but I do have a conlang plan (far future
plan) in mind and the US Census website was very little help.  I'm
looking for info on the number of speakers of various Indian
languages in the Washington DC area, which for my purposes means
just DC and the counties of VA and MD bordering the District
itself.  I'd like to know which individual Indian languages are
spoken and the number of speakers of each.

Does anyone know how I might find such info?

Cheers,
Eamon

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