Today I came across an interesting post by Mark Adomanis at Forbes:
“For the most part Russians are in and around all of the big [US] population centers. You can look at the map and easily pick out most of the major metropolitan areas and even a few others (like Minneapolis) that appear to be somewhat over represented. But Houston and Dallas are noteworthy for their absence…” http://www.forbes.com/sites/markadomanis/2013/08/20/why-arent-there-any-russians-in-texas/
I have no theories of my own either (and have never even been to Texas!), but I am curious to hear yours!