From an article at Fox News:
In 2010, Iowa’s numbers were just shy of 40,000, but according to data from the Iowa Department of Public Safety, last year the number crested 220,000. In 2011 alone, the number of permits issued in the state more than doubled.
Nationally, a report by the Crime Prevention Research Center found that between 2007 and 2014 found there was a 127-percent increase in gun permit holders in America. However, in the same time period, Iowa saw over 400 percent growth in permit holders. Ross Loder, the bureau chief of the weapons permits division of the Iowa Department of Public Safety, says is likely due to a change in state gun permit laws. . . .
CPRC in other news. From the Northwest Herald in Illinois:
A July 2014 report by the pro-gun Crime Prevention Research Center pegged the number of Americans with concealed-carry permits at 11.1 million, almost two and a half times the 4.5 million it estimated in 2007. That number does not include “open carry,” which is allowed in a number of states, both with or without a permit required. . . .