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