Many of the undocumented immigrants living in Maryland entered the United States more than 10 years ago. After the Great Recession began in 2008, fewer people entered the United States illegally or overstayed their visas. As a result, the population of undocumented immigrants in the U.S. is now made up of mostly long-term residents.
Information about the undocumented immigrant population in the U.S. was gathered by the Census Bureau and analyzed by Pew Research Center in a report that found that the undocumented immigrant population grew for two decades before peaking at 12.2 million in 2007. In 2008, the number of undocumented immigrants in the U.S. dropped, and the population has stabilized at approximately 11.1 million for six years straight.