I don’t know the numbers; this is purely anecdotal. But I have seen them in places in rural north Florida and south Georgia, and one time when I mentioned this on FR, someone in the midwest said that there were a number of these little mosques popping up in his area, too.
One thing that I actually found the most disturbing, however, was when I visited Houston for a conference. They took us to visit courtrooms (I’m a legal translator) and to the new state court. We passed by the old court building, right in the heart of the old “legal district,” a beautiful 19th century building with wide marble steps and a columned portico - and a huge new banner hanging across the front reading “Islamic Dawa Center.” I can’t believe it was cheap to buy the old courthouse, but then, the Saudis don’t have to worry about money.
By a strange coincidence, the Federal trial we went to watch involved a Houston-area Pakistani who was being sentenced for a complicated money-laundering scheme that involved sending money from bogus real-estate transactions to a terrorist group in Pakistan.