It serves the unincorporated area (not in any city limits) of Hamilton Mill, Gwinnett County, a suburb of Atlanta, as well as the Gwinnett County portion of Braselton.

It has 3,997 students, and the most recent attendance counts have named it the largest school in Georgia.

[5] Mill Creek was named for the fourth consecutive year as one of the schools in the top 5% in the country with regard to academics and test results.

The Mill Creek High school newspaper has won many awards.

In the statewide Journalism Banquet of 2007, The Hawk Print won first place in "Best Art or Illustration," "Best Photography," "Best News Section," and "Most Improved.