a lot of them were back in the native land once rome allowed them to come back. However some still did not return and they spread all over. Sorry I know thats a vague answers but you wont find all the actual places and numbers anywhere.
2Ki.25:8-11; 2Chr.36:20-23, Jer.52:29-34;
Year 3460 [ 606 BCE, Judah kings end at Babylon with Daniel, now at 2009 CE ], that was 2615 years ago [ of the 2670 years given by Daniel ].
1.
The nation to produce:
606 BCE [ + 600 CE = ] , to the Quran. Dome of the Rock 691 CE. Some of the tribes in Turkey, 610 CE, after temple destroyed 70 CE at Jerusalem.
2.
The nation to produce:
606 BCE [ + 503 CE + 606 + 503 = ] 1612 CE, KJV Bible published near one year ago.
3.
Nations to recieve:
606 BCE [ + 544 CE + 606 CE + 544 CE = ] 1694 CE, word of truth circulating in the world.
4.
Nations rise to WW1 [ 2520 years after year 3460, Judah end ]:
606 BCE [ + 654 CE + 606 CE + 654 CE = ] 1914 CE.