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 4,035 at the 2000 census and was estimated to be 4,167 in 2006. Local attractions in Dyersville include: The Basilica of St. Francis Xavier, one of the few minor Roman Catholic basilicas in the United States outside a large metropolitan area. The Ertl Company as well as an outlet store. The National Farm Toy Museum. The baseball field built for the film Field of Dreams.