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