803 24 Avenue Southeast
Boston Quarantine Zone
A young child approaches the gate leading to the Boston QZ and is brought inside by some FEDRA soldiers in episode 1x01 “When You're Lost in the Darkness”. Ellie and Riley sneak out of the FEDRA school and down the alleys to an abandoned hotel in episode 1x07 “Left Behind”.
Source: HBOsTheLastofUs — Twitter