Towns with the highest proportion of the native ethnic group of the country its in

[Switchedon20]

I imagine some of you have come across a couple of articles proclaiming the town of Ripley, in Derbyshire, to be the most English town in England, with around 89% of the population being of Ethnic English descent. That got me thinking, which town/village in your country would have the highest proportion of people having the ethnicity of the country said town/village is situated in?
That all probably sounded very convoluted to someone reading it so I'll give an example: The most German town in Germany, the most Spanish town in Spain etc.

Any ideas what they could be?

[Dr_Maul]

Yazd, in Iran has got to be at least 99% Ethnic Persian, not to mention the fact that Zoroastrians make up 5% of the 400,000 population (20,000)

[Brás Garcia de Mascarenhas]

Basically outside the metropolitan area of Lisbon and Porto every other town\village\city is in the range of 90% to 99% ethnic Portuguese.

Edit: Now that I think about it, even Porto metropolitan area is likely at least 90% ethnic Portuguese if not more. Only Lisbon is probably in the ~80% range.

[Creoda]

I imagine some of you have come across a couple of articles proclaiming the town of Ripley, in Derbyshire, to be the most English town in England, with around 89% of the population being of Ethnic English descent. That got me thinking, which town/village in your country would have the highest proportion of people having the ethnicity of the country said town/village is situated in?
That all probably sounded very convoluted to someone reading it so I'll give an example: The most German town in Germany, the most Spanish town in Spain etc.

Any ideas what they could be?

There must be countless small towns and villages across England that are 97%+ ethnic English.

A better question would be what are the most native cities in each country.