This might seem a silly question but...

[Filuwaúrdjan]

To my knowledge, the most Welsh county is Oneida County, Idaho, where 20.8% identify as such.

Damn Mormons messing these statistics up.

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English is very much an Indo-European language.

Btw, English is the first language of the overwhelming majority of people in Wales. Has been since the 19th century.

[Filuwaúrdjan]

The fact that Inyo county had a lot more Welsh than normal came from a Wikipedia map. I would like to know if someone could send me the full data on which counties are more Welsh than average.

As you can see, Oneida County is #1.  There are also counties in northeastern Pennsylvania with a significant Welsh population.

Which should be expected as Scranton (and other mining towns in the general area) was the main destination for Welsh immigrants in the 19th century.

Though there are a lot of people with Welsh surnames (Jones, Davis, Roberts and so on) in areas with very little 19th century Welsh immigration.

[Filuwaúrdjan]

But in an area like Oneida County, people are not going to identify as culturally Welsh; they identify as culturally Mormon.

But of course.