Avondale is Community Area 21 on the city's official list.

It spans the area from Diversey Ave (2800 N) north to Addison St (3600 N), from the Chicago River west to the Metra tracks south of Belmont and to Pulaski Rd (4000 W) north of Belmont. Avondale includes the Belmont Gardens and Polish Village / Jackowo neighborhoods.