2020 census

The 2020 United States census counted 82 people, 49 households, and 30 families in Republic.^[6][7] The population density was 351.9 per square mile (135.9/km²). There were 79 housing units at an average density of 339.1 per square mile (130.9/km²).^[7][8] The racial makeup was 92.68% (76) white or European American (91.46% non-Hispanic white), 1.22% (1) 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 6.1% (5) from two or more races.^[9] Hispanic or Latino of any race was 1.22% (1) of the population.^[10]

Of the 49 households, 26.5% had children under the age of 18; 49.0% were married couples living together; 22.4% had a female householder with no spouse or partner present. 32.7% of households consisted of individuals and 18.4% had someone living alone who was 65 years of age or older.^[7] The average household size was 1.7 and the average family size was 1.9.^[11] The percent of those with a bachelor’s degree or higher was estimated to be 7.3% of the population.^[12]

9.8% of the population was under the age of 18, 7.3% from 18 to 24, 20.7% from 25 to 44, 37.8% from 45 to 64, and 24.4% who were 65 years of age or older. The median age was 54.5 years. For every 100 females, there were 86.4 males.^[7] For every 100 females ages 18 and older, there were 85.0 males.^[7]

The 2016-2020 5-year American Community Survey estimates show that the median household income was $49,375 (with a margin of error of +/- $23,073) and the median family income was $60,543 (+/- $5,678).^[13] Males had a median income of $27,250 (+/- $22,010) versus $20,000 (+/- $5,199) for females. The median income for those above 16 years old was $24,792 (+/- $4,719).^[14] Approximately, 10.4% of families and 10.3% 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.^[15][16]

2010 census

As of the census^[17] of 2010, there were 116 people, 61 households, and 34 families living in the city. The population density was 446.2 inhabitants per square mile (172.3/km²). There were 95 housing units at an average density of 365.4 per square mile (141.1/km²). The racial makeup of the city was 95.7% White, 3.4% Native American, and 0.9% from two or more races.

There were 61 households, of which 14.8% had children under the age of 18 living with them, 47.5% were married couples living together, 8.2% had a female householder with no husband present, and 44.3% were non-families. 39.3% of all households were made up of individuals, and 16.4% 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 2.47.

The median age in the city was 52.5 years. 14.7% of residents were under the age of 18; 4.2% were between the ages of 18 and 24; 16.4% were from 25 to 44; 43.1% were from 45 to 64, and 21.6% were 65 years of age or older. The gender makeup of the city was 50.0% male and 50.0% female.

2000 census

As of the census^[18] of 2000, there were 161 people, 84 households, and 49 families living in the city. The population density was 616.0 inhabitants per square mile (237.8/km²). There were 108 housing units at an average density of 413.2 per square mile (159.5/km²). The racial makeup of the city was 99.38% White and 0.62% Native American. Hispanic or Latino of any race were 1.86% of the population.

There were 84 households, out of which 20.2% had children under the age of 18 living with them, 54.8% were married couples living together, 4.8% had a female householder with no husband present, and 40.5% were non-families. 38.1% of all households were made up of individuals, and 21.4% had someone living alone who was 65 years of age or older. The average household size was 1.92 and the average family size was 2.50.

In the city, the population was spread out, with 18.0% under the age of 18, 24.8% from 25 to 44, 29.8% from 45 to 64, and 27.3% who were 65 years of age or older. The median age was 50 years. For every 100 females, there were 96.3 males. For every 100 females age 18 and over, there were 97.0 males.

The median income for a household in the city was $27,679, and the median income for a family was $33,750. Males had a median income of $26,250 versus $16,250 for females. The per capita income for the city was $18,399. About 8.7% of families and 9.7% of the population were below the poverty line, including 31.6% of those under the age of eighteen and none of those 65 or over.