At the 2000 census there were 180 residents in Brandonville. As of 2020, the population density was 153.4 inhabitants per square mile (59.2/km2). There were 99 housing units at an average density of 70.0 per square mile (27.0/km2). The racial makeup of the CDP was 100.00% White.[5]
Of the 90 households 23.3% had children under the age of 18 living with them, 43.3% were married couples living together, 11.1% had a female householder with no husband present, and 34.4% were non-families. 31.1% of households were one person and 14.4% were one person aged 65 or older. The average household size was 2.41 and the average family size was 2.98.
The age distribution was 19.4% under the age of 18, 6.5% from 18 to 24, 24.4% from 25 to 44, 27.6% from 45 to 64, and 22.1% 65 or older. The median age was 44 years. For every 100 females, there were 114.9 males. For every 100 females age 18 and over, there were 105.9 males.
The median household income was $26,125 and the median family income was $36,875. Males had a median income of $25,833 versus $20,417 for females. The per capita income for the CDP was $14,973. About 3.8% of families and 7.7% of the population were below the poverty line, including 4.8% of those under the age of eighteen and none of those sixty five or over.
