Surname distribution maps for Ferrin
Ferrin in the 1881 Census
Ferrin in the 21st Century
The maps, if available, show both where there are more people named Ferrin and where they are most concentrated.
The darker the colour, the more people in that county are named Ferrin.
The larger the dot, the greater the proportion of people in that county are named Ferrin.
Hovering over the dots will give you the individual statistics for that county.