2020 census

The 2020 United States census counted 51 people, 17 households, and 16 families in Bremen.^[5][6] The population density was 30.2 per square mile (11.7/km²). There were 25 housing units at an average density of 14.8 per square mile (5.7/km²).^[6][7] The racial makeup was 94.12% (48) white or European American (94.12% non-Hispanic white), 0.0% (0) black or African-American, 0.0% (0) Native American or Alaska Native, 0.0% (0) Asian, 0.0% (0) Pacific Islander or Native Hawaiian, 0.0% (0) from other races, and 5.88% (3) from two or more races.^[8] Hispanic or Latino of any race was 0.0% (0) of the population.^[9]

Of the 17 households, 0.0% had children under the age of 18; 94.1% were married couples living together; 0.0% had a female householder with no spouse or partner present. 5.9% of households consisted of individuals and 5.9% had someone living alone who was 65 years of age or older.^[6] The average household size was 2.0 and the average family size was 2.3.^[10] The percent of those with a bachelor’s degree or higher was estimated to be 7.8% of the population.^[11]

23.5% of the population was under the age of 18, 0.0% from 18 to 24, 13.7% from 25 to 44, 29.4% from 45 to 64, and 33.3% who were 65 years of age or older. The median age was 58.4 years. For every 100 females, there were 45.7 males.^[6] For every 100 females ages 18 and older, there were 44.4 males.^[6]

The 2016-2020 5-year American Community Survey estimates show that the median household income was $58,750 (with a margin of error of +/- $15,444).^[12] Approximately, 0.0% of families and 0.0% of the population were below the poverty line, including 0.0% of those under the age of 18 and 0.0% of those ages 65 or over.^[13][14]