Dyersville is a city in eastern Delaware and western Dubuque counties in the U.S. state of Iowa. It is part of the Dubuque, Iowa, Metropolitan Statistical Area. The population was 4,058 at the 2010 census, up from 4,035 at the 2000 census. Local attractions in Dyersville include: The baseball field built for the film Field of Dreams. The Basilica of St. Francis Xavier, one of the few minor Roman Catholic basilicas in the United States outside a large metropolitan area.