www.google.com/maps/d/edit?mid=1zu8mWjWHCKOfnGfr3sc_aYtv_a0AhaTQ&usp=sharing - primary zerg90 map of Baltimore County - created April 5 2021 from the Zerg90 Maryland Statewide Map
baltimore is an indpendant city - it is equivalent to a county - per - https://www.reddit.com/r/baltimore/comments/7xbjel/what_is_the_difference_between_baltimore_city_and/