The information on the pages linked below is (intended to be) built up from Birth, Death, Marriage, and Census index extractions, together with current phone books and/or electoral rolls as appropriate.
In general for each area there will be a map whose markers will be placed in a main town for the Parish, or County or State concerned.
Further information is available by clicking on the legend on the lhs of each map to open the bubble associated with each marker, and clicking again on the surname link inside.
Check the Sources page on the latter for the status of the extraction and analysis of the data included.