After initially heading east, the route turns directly north, changes names from Crabapple Road to Birmingham Highway (named after the small community the route travels through on its way north out of Alpharetta), and heads into the western portions of Milton.

SR 372 then angles slightly northeast, and briefly changes names to Birmingham Road as it crosses into Cherokee County, before making a sharp turn to the north and traveling through the unincorporated communities of Free Home and Lathemtown, now locally known as Ball Ground Road.

Those numbers then steadily decrease as SR 372 heads north, going from 9,390 initially down to just over 3,000 as Cherokee County approaches.

The area south of, and into, Ball Ground sees an average vehicle load of between 7,000 and 7,500, cresting once more at 8,680 heading north out of downtown towards I-575/SR 5/SR 515.

[3] The first indications of a roadway following today's routing of SR 372 makes its appearance on Georgia state road maps in 1953, when the portion of the route in Fulton County appears on state maps as a county route, and which connected in the community of Birmingham with today's New Bullpen Road and then Union Hill Road to meet SR 20 east of Canton.