 As of the 2010 census the metropolitan area population of 101,407 ranked 19th most populous in the State of Pennsylvania and the 349th most populous in the United States.Adams County is also a part of the larger Harrisburg-York-Lebanon, PA Combined Statistical Area (CSA), which combines the populations of Adams County with those of Cumberland, Dauphin, Lebanon, Perry and York Counties in Pennsylvania.The Combined Statistical Area ranked 5th in the State of Pennsylvania and 43rd most populous in the United States with a population of 1,219,422.