Norwegian Americans (Bokmål: Norskamerikanere, Nynorsk: Norskamerikanarar) are Americans with ancestral roots in Norway. Norwegian immigrants went to the United States primarily in the latter half of the 19th century and the first few decades of the 20th century. There are more than 4.5 million Norwegian Americans, according to the most recent U.S. census,; most live in the Upper Midwest and on the West Coast of the United States. Norwegian Americans are currently the 10th-largest European ancestry group in the United States.