Monona county is located west of Crawford and north of Harrison county, along the western border of the state. It has a population of 18,213, and is traversed by The Chicago & Northwestern and The Illinois Central railroads. The county seat and chief town of the county is Onawa, located on the Northwestern line, between Omaha and Sioux City. According to the census of 1910, Monona county had a Swedish population of 481, but no large number of Swedes are found concentrated at any point in the county. A small settlement of Swedes is located in the country, a short distance from Castana, and Swedish farmers are found scattered over the whole county. In Onawa and Mapleton the Swedish nationality is represented by a few business men. The Danes are more numerous in Monona county than the Swedes, and several Danish colonies are located within its borders.