There are no indian reservations in the state of Maryland.
Most native americans were forced to leave Maryland during the 1700’s, when eastern tribes were being displaced by colonial expansion. These tribes are not extinct, but except for the descendants of Maryland natives who hid or were assimilated into white society, they do not live in Maryland anymore.
Some tribes that were once native to Maryland ended up on Indian reservations in Oklahoma. Other Maryland Indians became refugees and joined larger tribes, where their descendants still live today.
There is one unrecognized indian community in La Plata, Maryland called the Piscataway-Conoy Confederacy. Their address is:
P.O. Box 1484
La Plata, Maryland 20646
but this is not a federal indian reservation.