No. The only reason
to file a DC return is to get back any DC withholding.
DC and MD have a
reciprocity agreement--an agreement between two states that allows residents of
one state to request exemption from tax withholding in the other
(reciprocal) state. This can save you the trouble of having to file multiple
state returns.
Since you have no DC taxes withheld, file only your MD resident return.
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