2020 census

The 2020 United States census counted 296 people, 118 households, and 66 families in Otis.^[8][9] The population density was 945.7 per square mile (365.1/km²). There were 162 housing units at an average density of 517.6 per square mile (199.8/km²).^[9][10] The racial makeup was 91.22% (270) white or European American (88.85% non-Hispanic white), 0.34% (1) black or African-American, 1.01% (3) Native American or Alaska Native, 0.0% (0) Asian, 0.0% (0) Pacific Islander or Native Hawaiian, 0.68% (2) from other races, and 6.76% (20) from two or more races.^[11] Hispanic or Latino of any race was 6.42% (19) of the population.^[12]

Of the 118 households, 21.2% had children under the age of 18; 49.2% were married couples living together; 16.9% had a female householder with no spouse or partner present. 35.6% of households consisted of individuals and 19.5% had someone living alone who was 65 years of age or older.^[9] The average household size was 2.9 and the average family size was 4.2.^[13] The percent of those with a bachelor’s degree or higher was estimated to be 6.4% of the population.^[14]

21.3% of the population was under the age of 18, 9.1% from 18 to 24, 24.7% from 25 to 44, 24.3% from 45 to 64, and 20.6% who were 65 years of age or older. The median age was 42.0 years. For every 100 females, there were 87.3 males.^[9] For every 100 females ages 18 and older, there were 84.9 males.^[9]

The 2016-2020 5-year American Community Survey estimates show that the median household income was $38,750 (with a margin of error of +/- $24,369) and the median family income was $55,781 (+/- $11,218).^[15] Males had a median income of $30,250 (+/- $18,809) versus $25,972 (+/- $19,542) for females. The median income for those above 16 years old was $26,591 (+/- $13,376).^[16] Approximately, 8.2% of families and 10.4% of the population were below the poverty line, including 7.9% of those under the age of 18 and 0.0% of those ages 65 or over.^[17][18]

2010 census

As of the census^[19] of 2010, there were 282 people, 146 households, and 84 families residing in the city. The population density was 940.0 inhabitants per square mile (362.9/km²). There were 169 housing units at an average density of 563.3 per square mile (217.5/km²). The racial makeup of the city was 96.1% White, 0.4% African American, 0.7% Native American, 0.4% Asian, 0.7% from other races, and 1.8% from two or more races. Hispanic or Latino of any race were 2.5% of the population.

There were 146 households, of which 15.8% had children under the age of 18 living with them, 46.6% were married couples living together, 6.2% had a female householder with no husband present, 4.8% had a male householder with no wife present, and 42.5% were non-families. 40.4% of all households were made up of individuals, and 19.8% had someone living alone who was 65 years of age or older. The average household size was 1.93 and the average family size was 2.56.

The median age in the city was 52.7 years. 16% of residents were under the age of 18; 8.1% were between the ages of 18 and 24; 14.2% were from 25 to 44; 37.2% were from 45 to 64; and 24.5% were 65 years of age or older. The gender makeup of the city was 51.4% male and 48.6% female.

2000 census

As of the census^[20] of 2000, there were 325 people, 148 households, and 92 families residing in the city. The population density was 1,080.3 inhabitants per square mile (417.1/km²). There were 170 housing units at an average density of 565.1 per square mile (218.2/km²). The racial makeup of the city was 98.77% White, 0.31% Native American, 0.31% Asian, and 0.62% from two or more races. Hispanic or Latino of any race were 1.85% of the population.

There were 148 households, out of which 30.4% had children under the age of 18 living with them, 52.0% were married couples living together, 6.1% had a female householder with no husband present, and 37.8% were non-families. 35.1% of all households were made up of individuals, and 22.3% had someone living alone who was 65 years of age or older. The average household size was 2.20 and the average family size was 2.82.

In the city, the population was spread out, with 22.2% under the age of 18, 10.2% from 18 to 24, 21.8% from 25 to 44, 24.6% from 45 to 64, and 21.2% who were 65 years of age or older. The median age was 43 years. For every 100 females, there were 94.6 males. For every 100 females age 18 and over, there were 94.6 males.

The median income for a household in the city was $27,109, and the median income for a family was $35,625. Males had a median income of $26,875 versus $18,929 for females. The per capita income for the city was $14,290. About 4.5% of families and 6.5% of the population were below the poverty line, including 2.3% of those under age 18 and 15.3% of those age 65 or over.