Osterdock is a city located in Clayton County, Iowa, United States. As of the 2020 census, the city had a total population of 43, down from 50 in 2000. History Osterdock got its start in the year 1877, following construction of the railroad through that territory. Geography Osterdock is located at 42°43'47" North, 91°9'42" West (42.729756, -91.161709). According to the United States Census Bureau, the city has a total area of , all land. Demographics 2010 census As of the census of 2010, there were 59 people, 23 households, and 16 families living in the city. The population density was . There were 23 housing units at an average density of . The racial makeup of the city was 94.9% White and 5.1% from two or more races. Hispanic or Latino of any race were 3.4% of the population. There were 23 households, of which 26.1% had children under the age of 18 living with them, 60.9% were married couples living together, 4.3% had a female householder with no husband present, 4.3% had a male householder with no wife present, and 30.4% were non-families. 26.1% of all households were made up of individuals, and 8.7% had someone living alone who was 65 years of age or older. The average household size was 2.57 and the average family size was 3.00. The median age in the city was 50.3 years. 20.3% of residents were under the age of 18; 6.9% were between the ages of 18 and 24; 13.6% were from 25 to 44; 44.1% were from 45 to 64; and 15.3% were 65 years of age or older. The gender makeup of the city was 42.4% male and 57.6% female. 2000 census As of the census of 2000, there were 50 people, 21 households, and 16 families living in the city. The population density was . There were 21 housing units at an average density of . The racial makeup of the city was 100.00% White. There were 21 households, out of which 23.8% had children under the age of 18 living with them, 76.2% were married couples living together, and 23.8% were non-families. 23.8% of all households were made up of individuals, and 9.5% had someone living alone who was 65 years of age or older. The average household size was 2.38 and the average family size was 2.81. In the city, the population was spread out, with 20.0%