Here is Washington DC:
All five districts are extremely solid Democratic ridings. Obama won the blue district on the eastern side of the Anacostia River in 2008 98.8-.08 over McCain. 2 districts are big majority Black (blue and green), 1 is majority Black with a large Hispanic population (yellow), 1 is majority white with a large Black population (purple) and 1 district has a big white majority (red).
Some name possibilities:
Red: Washington West--Georgetown
Yellow: Washington North
Green: Washington Northeast
Blue: Washington Southeast (or perhaps Fort Dupont--Anacostia)
Purple: Washington--Capitol (or Washington Center)
I unfortunately didn't have time when I posted them last night.
Red: Washington Northwest—Georgetown
Yellow: Washington North—Howard—Pentworth
Green: Washington Northeast—National Arboretum
Blue: Washington—Anacostia
Purple: Washington—Capitol Hill—Downtown
Let me know if I did anything wrong.
"Downtown" is never used in a riding's name. The preference is for "Centre" or in this case it would be "Center". I don't think "National Arboretum" belongs in a riding name either. "Capitol Hill" sounds nice, but may not be appropriate either. What about "Beltway"? Perhaps just calling it "Washington Center" would be best.
Washington Center or Washington—Capitol Hill are both appropriate, I think. The north one is probably more appropriately Washington—Columbia Heights, though Petworth is also a thing. For northeast, maybe Washington Northeast—Brookland or Washington Northeast—Brentwood? Washington Northeast—University Heights? Ugh. Lots of no-name neighborhoods up in there.