United Kingdom in 1881 from:
The map demonstrates that the north shore of the former Lancaster County (The dark blue area at the top of the map) area of Barrow-in-Furness, Backbarrow, Ulverston, and Lancaster had the highest concentration of people named Barrow.
Distribution of Barrows in the United Kingdom in 1998
Distribution of Barrows in the United States
This program below shows how many Barrow's are in the US.