2020 census

The 2020 United States census counted 94 people, 43 households, and 22 families in Formoso.^[7][8] The population density was 380.6 per square mile (146.9/km²). There were 52 housing units at an average density of 210.5 per square mile (81.3/km²).^[8][9] The racial makeup was 87.23% (82) white or European American (86.17% 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, 3.19% (3) from other races, and 9.57% (9) from two or more races.^[10] Hispanic or Latino of any race was 9.57% (9) of the population.^[11]

Of the 43 households, 27.9% had children under the age of 18; 41.9% were married couples living together; 32.6% had a female householder with no spouse or partner present. 41.9% of households consisted of individuals and 25.6% had someone living alone who was 65 years of age or older.^[8] The average household size was 1.9 and the average family size was 2.4.^[12] The percent of those with a bachelor’s degree or higher was estimated to be 9.6% of the population.^[13]

33.0% of the population was under the age of 18, 0.0% from 18 to 24, 25.5% from 25 to 44, 17.0% from 45 to 64, and 24.5% who were 65 years of age or older. The median age was 37.5 years. For every 100 females, there were 91.8 males.^[8] For every 100 females ages 18 and older, there were 117.2 males.^[8]

The 2016-2020 5-year American Community Survey estimates show that the median household income was $28,295 (with a margin of error of +/- $9,417) and the median family income was $29,432 (+/- $14,837).^[14] Males had a median income of $26,250 (+/- $7,200).^[15] Approximately, 17.1% of families and 18.6% of the population were below the poverty line, including 5.6% of those under the age of 18 and 31.0% of those ages 65 or over.^[16][17]

2010 census

As of the census^[18] of 2010, there were 93 people, 48 households, and 26 families living in the city. The population density was 332.1 inhabitants per square mile (128.2/km²). There were 65 housing units at an average density of 232.1 per square mile (89.6/km²). The racial makeup of the city was 98.9% White and 1.1% from two or more races. Hispanic or Latino of any race were 1.1% of the population.

There were 48 households, of which 14.6% had children under the age of 18 living with them, 39.6% were married couples living together, 8.3% had a female householder with no husband present, 6.3% had a male householder with no wife present, and 45.8% were non-families. 41.7% of all households were made up of individuals, and 20.8% had someone living alone who was 65 years of age or older. The average household size was 1.94 and the average family size was 2.54.

The median age in the city was 56.5 years. 18.3% of residents were under the age of 18; 2.3% were between the ages of 18 and 24; 14% were from 25 to 44; 28% were from 45 to 64; and 37.6% were 65 years of age or older. The gender makeup of the city was 55.9% male and 44.1% female.

2000 census

As of the census^[19] of 2000, there were 129 people, 68 households, and 35 families living in the city. The population density was 459.6 inhabitants per square mile (177.5/km²). There were 78 housing units at an average density of 277.9 per square mile (107.3/km²). The racial makeup of the city was 99.22% White and 0.78% Pacific Islander. Hispanic or Latino of any race were 1.55% of the population.

There were 68 households, out of which 16.2% had children under the age of 18 living with them, 48.5% were married couples living together, 4.4% had a female householder with no husband present, and 47.1% were non-families. 45.6% of all households were made up of individuals, and 29.4% had someone living alone who was 65 years of age or older. The average household size was 1.90 and the average family size was 2.64.

In the city, the population was spread out, with 15.5% under the age of 18, 3.9% from 18 to 24, 20.9% from 25 to 44, 34.1% from 45 to 64, and 25.6% who were 65 years of age or older. The median age was 53 years. For every 100 females, there were 101.6 males. For every 100 females age 18 and over, there were 98.2 males.

The median income for a household in the city was $22,500, and the median income for a family was $33,958. Males had a median income of $31,458 versus $14,688 for females. The per capita income for the city was $14,509. There were 6.9% of families and 11.6% of the population living below the poverty line, including no under eighteens and 18.8% of those over 64.