Norwegian Americans (Norwegian: norskamerikanere) comprise Americans with ancestral roots from Norway. Norwegian immigrants went to the United States primarily in the later 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, and most live in the Upper Midwest. Norwegian Americans currently comprise the 10th largest European ancestry group in the United States.