Indiana gains from commuting. More money flows into Indiana than leaves the state from the daily movement of workers. In 2011 the difference between the inflow and the outflow was in excess of $4 billion.
At the county level, 70 counties are net recipients of these money flows from commuting, while only 22 see a net outflow. It is these 22 counties that provide the jobs that feed their neighbors.
As you would guess, the greatest outflow ($15.5 billion) is from Marion County, where Indianapolis jobs support the rooftops of the surrounding counties. The largest inflow ($6.1 billion) is enjoyed by Hamilton County. Johnson County enjoys a net inflow of $2.3 billion.