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In page Lost Nation, Iowa:

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There were 210 households out of which 30.0% had children under the age of 18 living with them, 52.4% were married couples living together, 7.6% had a female householder with no husband present, and 34.8% were non-families. 30.5% of all households were made up of individuals and 21.0% had someone living alone who was 65 years of age or older. The average household size was 2.37 and the average family size was 2.88.