If you are employed, unless you work from home, you probably have to commute to work. Many commute from the suburbs to the nearest urban center, and for some, those urban centers are in different states than their residences. This map highlights that phenomenon, showing the percentage of workers in each county who commute to a different state for work.

Not surprisingly, the counties with the highest percentages are adjacent to state borders. Nine counties have greater than 50% commuting to a different state. In most cases, the flow is unidirectional. For example, people leave Phenix City, AL, to work in Columbus, GA, or they drive from Vancouver, WA, to Portland, OR. This may be for tax purposes, or simply because they prefer the lifestyle or affordability of a certain suburb.

Data source: http://factfinder.census.gov/ (ACS 5-yr, Table S0801)