Don't know about all Louisiana regiments but I did research the birthplaces of the Louisiana Tiger regiments that served in Virginia. Unfortunately, not all of the regiments' muster books survived the war and on those that did not every man listed his place of birth. But using the available data, the 9th Louisiana had the most men born outside Louisiana. Of the 1,168 men who listed a place of birth, 769 were born outside Louisiana (116 of these were born outside the U.S.). The vast majority of members were living in North Louisiana at the time of their enlistment.