Renowned statistician Nate Silver provides fascinating charts on the earliest and latest median arrival times to work by city on his blog.

The metro area with the earliest workday is Hinesville, Ga. The median worker there arrives at work at 7:01 a.m. There’s a good chance she is in the military; the Hinesville area includes Fort Stewart and the Army’s 3rd Infantry Division. Military metros account for a number of the earliest-to-work communities, including Killeen, Texas (Fort Hood), and Jacksonville, N.C. (Camp Lejeune). Many of the other early-arriving metros, such as Bakersfield, Calif., rely on farming and agriculture to generate income.