In a large-scale collaboration by four universities, led by Robert Adelman, a sociologist at the State University of New York at Buffalo, researchers compared immigration rates with crime rates for 200 metropolitan areas over the last several decades. The selected areas included huge urban hubs like New York and smaller manufacturing centers less than a hundredth that size, like Muncie, Ind., and were dispersed geographically across the country.
According to data from the study, a large majority of the areas have many more immigrants today than they did in 1980 and fewer violent crimes. The Marshall Project extended the study’s data up to 2016, showing that crime fell more often than it rose even as immigrant populations grew almost across the board.
In 136 metro areas, almost 70 percent of those studied, the immigrant population increased between 1980 and 2016 while crime stayed stable or fell. The number of areas where crime and immigration both increased was much lower — 54 areas, slightly more than a quarter of the total. The 10 places with the largest increases in immigrants all had lower levels of crime in 2016 than in 1980.