Normally, one mile comprises eight Chicago blocks, but the arterial streets Roosevelt Road, formerly named Twelfth Street and at 1200 South, and Cermak Road (Twenty-Second Street) were platted before the eight-blocks-per-mile plan was implemented. Roosevelt Road is one mile south of Madison Avenue and there are twelve blocks within that mile.
Normally, one mile is divided into eight Chicago blocks, but certain streets like Roosevelt Road and Cermak Road were created before adopting this system. Roosevelt Road is situated one mile south of Madison Avenue and contains twelve city blocks in that area.