Marynook is part of Avalon Park, one of the city's official community areas. Marynook bounded by 87th St to 83rd St, Dorchester Ave (1400 E) west to the IC RR tracks.

It lies within ZIP code 60619. Avalon Park – the park – lies within the boundaries of Marynook, the neighborhood.

Marynook is basically a 70-acre subdivision, built from the late 50s through the early 60s, and showcasing the architecture and landscaping of that period. Its population is almost exclusively African-American.