FlowingData – a website that explores how statisticians use analysis, visualization, and exploration to understand data and ourselves – crunched the numbers representative of when Americans begin their morning commute to work.

And despite what the gridlock most of us experience during morning rush hour would indicate, not everyone leaves for work at the same time.

In Montgomery County, approximately 386,266 people commute to work every day. The majority of those commuters leave their homes during three different blocks of time: 7:00-7:29 AM, 7:30-7:59 AM, or 8:00-8:29 AM.

As we would expect, many commuters leave home between 7:00 and 8:00 AM. However, rates concentrate around this hour much more in some counties than others. This is especially true for counties in the Midwest. Around half of commuters in many Midwest counties leave during this hour.

In contrast, commuters are more spread out between 7:00 and 8:30 AM in other areas, like Montgomery County.

Click here to read more about when Americans commute to work from FlowingData.