Originally Posted by mot29
from the dc.gov www site:
In most areas of the District, parking meter effective hours are from 7 am until 6:30 pm, Monday through Friday only. However, in densely populated Georgetown, as well as on several blocks around the MCI and Convention Centers, parking meter hours may extend until 10 pm, Monday through Saturday.
I don't know about up Wisconsin or on the side streets, but on M street, I believe it is well past 6:30. The 10PM figure sounds about right.