international registry of duffuses
| Total Estimated Households | Total Households in Registry | Total Estimated Population | # of Counties, States, Provinces Where Households Reside | Most Populous County, State, Territory, or Province |
| United States | 274 | 196 | 603 | 29 | New York |
| Canada | 143 | 102 | 315 | 7 | Ontario |
| Australia | 116 | 83 | 255 | 6 | Victoria |
| New Zealand | 7 | 5 | 15 | 2 | North Island |
| Great Britain | 528 | 377 | 1,320 | 56 | Aberdeenshire |
| Nor. Ireland | 8 | 6 | 20 | 3 | Co. Antrim |
| South Africa | 20 | 14 | 56 | 3 | Transvaal |
Source - Halbert's Family Hertiage - 1996
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