Source, lived in VA for a decade, hunting for wild pawpaws and growing my own trees. Before we moved out of the state we had a pawpaw "collection" of about fifty (ten we owned, approx forty we found in the national forest and harvested yearly).
Unfortunately, their popularity in the last few years has caused them to be over harvested by people selling them. Additionally, they taste the very best right after falling to the ground naturally but lots of folks keep trying to knock them or shake or climb the trees way to early in the season causing a lot of damage to the trees.
To find them in the city, put DC into this site and filter for Pawpaw: https://fallingfruit.org/
Swampy VA, of which NoVA is a part, is their native habitat and it's no surprise they do well there even with mixed sun.