I did find that Dearborn, Michigan had the most Muslims, by percent, among US cities, and in that city, according to Zogby, Muslims claim not to feel isolated. In fact, more generally, Zogby states that "Unlike Muslims in Europe, American Muslims do not tend to feel marginalized..." Pew research has similar findings.
That's mostly because Muslim immigrants to the United States are much richer than European Muslims.
And why are they richer?
Because Europe allows more low skill immigration/refugees would be my guess. Class plays a huge role in all these prejudices, and of course middle/upper class people are able to assimilate better and quicker as well. Still waiting for the answer to my previous question. Are non-muslim poorer African or Indian immigrants looked at the same way as Muslims? Of course stereotyping is the order of the day when looking at immigrant groups so it really matters more on how the group is (in terms of behaviors and class)than any one individual.