Hermosa is Community Area 20 on the city's official list of 77 neighborhood areas. The name is little used today.

Hermosa's official boundaries are Bloomingdale Ave (1800 N) to Belmont Ave (3200 N), RR tracks to Cicero Ave (4800 W). Unofficially the area extends from North Ave (1600 N) to Belmont, from Pulaski Rd (4000 W) to Cicero.

Parts of Hermosa are in ZIP codes 60639, 60641, and 60647.