To deal with old sensitive bank statements and the like....
DC has basically moved it's free shredding to only once or twice a year.
Trueshred in VA does community shred events for $10 per bankers box:
https://www.trueshred.com/calendar/
proshred does not state the fees for their drop-off shredding in baltimore:
https://www.proshred.com/washington-dc/drop-off-shredding/
eco-shred advertises monthly shred events for $10 per car, for up to 10 boxes:
https://www.ecoshredllc.com/shred-events/
in all cases I'd advise calling to find out actual current availability. The UPS store also accepts paper for shredding at an unspecified price per pound.