Raw data from the 2010 Religious Census

 Among other things, the census found that although there were less Catholics in the Western U.S., more Catholic Churches grew in the West! The picture above shows that Catholics (in purple) are the largest religious group second to the Southern Baptist (red).

The picture above shows the percentage of Catholics per population, if its in red, it's over 5% or more of that counties population. Unfortunately, Catholic numbers in the NW have dropped somewhat. :-(