Commuting To/From Work By County

Hi!  There used to be a mapping tool that would show how many people commute from outside a county to another county for work and vice versa but I cannot find it anymore.  For example:  Verizon is located in Hillsborough County, how many people work there drive from within Hillsborough County and how many work at Verizon who commute outside the county.  Does this mapping tool sound familiar to anyone?  If it does not exist anymore, is there another way to get county-to-county work commute flows?

Thanks,

Robin DiSalvo

Market Research Analyst - Tampa Bay EDC